Journal articles on the topic 'Surface sealing'
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Wei, Xinlong, Erguang Fu, Aolin Ban, Wy Zhu, Dl Wu, N. Li, and C. Zhang. "Influence of nano-alumina sealing treatment on corrosion resistance of Fe-based amorphous coatings." Anti-Corrosion Methods and Materials 69, no. 3 (March 18, 2022): 253–60. http://dx.doi.org/10.1108/acmm-09-2021-2545.
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Purpose The purpose of this paper is to investigate the effect of nano-alumina sealant sealing treatment on corrosion behavior of the Fe-based amorphous coatings deposited on 304 stainless steel plates by atmospheric plasma spraying (APS) with different hydrogen flow rates. Design/methodology/approach The surface morphology and microstructure of the unsealed and sealed coatings were characterized by scanning electron microscopy and X-ray diffraction. The corrosion resistance of the coatings was investigated by potentiodynamic polarization test and electrochemical impedance spectroscopy experiment in 3.5 Wt.% NaCl solution. Findings Results show that a few microcracks and pores exist in the as-sprayed Fe-based amorphous coatings. The pores on the surface of the coatings after sealing treatment have been filled with nano-alumina sealant, which can effectively prevent corrosive medium from entering into coatings. Electrochemical tests results show that the corrosion resistance of the coatings before sealing treatment decreases with the increase of hydrogen flow rate and is significantly improved by sealing treatment. Originality/value The effect of nano-alumina sealant sealing treatment on corrosion resistance of APS-sprayed Fe-based amorphous coatings is revealed. The corrosion resistance of the as-sprayed Fe-based amorphous coating can be significantly improved by nano-alumina sealant sealing treatment because of the blocking effect of nano-alumina sealant on corrosive medium, which confirms that the application of nano-alumina sealant sealing treatment is of a practical option to improve corrosion resistance of as-sprayed thermal sprayed coatings.
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Muratova, Leysan, Oskar Ismagilov, Elena Statseva, and Aydar Ablyazov. "FISSURE CARIES: DIAGNOSTIC ASPECTS OF CURATION IN THE SCHOOL DENTAL OFFICE." Actual problems in dentistry 15, no. 4 (February 12, 2020): 149–54. http://dx.doi.org/10.18481/2077-7566-2019-15-4-149-154.
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Subject. The problem of fissure caries remains one of the key in modern cariesology. For individual prevention, the most effective is the method of sealing fissures and fossae of the surface of the teeth. By sealing (sealing) fissures, the creation of a physical barrier for cariogenic factors and microbial plaque, remineralization of hard tooth tissues is achieved.
The goal is to evaluate the effectiveness of fissure sealing in 9-year-old children living in Kazan.
Methodology. The study was conducted using the clinical method and statistical analysis of the data. In total, 137 children aged 9 years old, studying in the third grades of the gymnasium No. 102 of Kazan, took part in it. The main group included 82 schoolchildren who performed non-invasive fissure sealing (the first permanent molars) with UltraSeal XT plus sealant, the comparison group consisted of 55 students who did not have fissure sealing.
Results. After 12 months, out of 165 teeth previously coated with sealant, sealant on 95 teeth was completely preserved (57.6 % of cases), sealant fell out or partially retained (tooth is intact) in 36.4 %, fissure caries at the place of sealant was detected in 6.1 % The effectiveness of fissure sealing, which consists in maintaining a healthy masticatory surface of hard tooth tissues, after 12 months of follow-up was 91.9 % with a reduction of caries of 76.7 %. A comparison of the data clearly showed that the condition of the first molars, which was used to seal the fissures, allows us to talk about the preservation of intact fissures in 88 % of cases, while 56 % of unsealed molars are prone to caries of fissures and only 44 % remain intact after a year.
Conclusions. A clinical study confirms that sealing fissures is a reliable and reasonable method for the prevention of fissure caries.
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Xu, Honglin, Zhi Zhang, Shilin Xiang, Bin Yang, and Taihe Shi. "Leakage Model of Tubing and Casing Premium Connection Based on Sinusoidal Contact Simulation between Rough Surfaces." Processes 11, no. 2 (February 13, 2023): 570. http://dx.doi.org/10.3390/pr11020570.
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This paper proposed a semi-theoretical model to quantitatively predict leakage rate of tubing and casing premium connections. The geometric parameters of the sealing surface profile approximated by a sinusoidal micro-convex surface were first obtained based on the random normal distribution sampling method. With the actual area prediction formula for elastic–plastic contact of an axisymmetric sinusoidal micro-convex body based on the equivalent simulation principle, the circumferential leakage width and radial average leakage height of the micro-leakage channel between sealing surfaces were then acquired with the surface roughness and geometric mean contact pressure. At last, the actual micro-leakage rate of the premium connection was derived by considering the non-uniform contact pressure distribution between sealing surfaces. An example was investigated to validate the model and reveal the sealing and leakage characteristics, and anti-leakage measures were proposed. The results show that average contact pressure, circumferential leakage width, and radial average leakage height between sealing surfaces were non-uniformly distributed. The leakage rate of a premium connection decreases exponentially with an increase in radial interference between sealing surfaces. In order to reduce leakage rate, it is beneficial to increase radial interference and lower sealing surface roughness.
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Grün, Jeremias, Simon Feldmeth, and Frank Bauer. "The sealing mechanism of radial lip seals: A numerical study of the tangential distortion of the sealing edge." Tribology and Materials 1, no. 1 (2022): 1–10. http://dx.doi.org/10.46793/tribomat.2022.001.
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The sealing behaviour of elastomeric radial lip seals is essentially affected by the sealing mechanism in the contact area between the sealing edge and the shaft surface. The relative motion between radial lip seal and shaft deforms the sealing edge tangentially in the circumferential direction. This mechanical deformation is considered essential for the sealing mechanism. In this study, a numerical approach is employed to simulate this deformation. A three-dimensional multiscale model serves this purpose. The radial lip seal geometry is described on the macro-scale. On the micro-scale, an artificial rough surface with a stochastic roughness distribution is applied to an ideal sealing edge surface. A new meshing algorithm is used to discretise different sealing edge surfaces and automatically generates structured hexahedral meshes of the sealing edges. Mesh transitions connect the resulting finely meshed sealing edge to the coarsely meshed global macro-scale mesh of the radial lip seal. The paper introduces the modelling method used to simulate the deformation of radial lip seals. Results are presented and discussed with reference to the sealing behaviour. This contributes to a better understanding of the sealing mechanism of radial lip seals. Keywords: radial lip seal, finite element analysis, surface roughness, elastic deformation, elastomers.
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Wang, Jian Jun, Jian Hua Sun, Shang Yu Yang, Yao Rong Feng, and Kai Lin. "Tubing String Thread Sealing Surfaces Damage Evaluation Based on Acoustic Elasticity Theory." Materials Science Forum 944 (January 2019): 828–34. http://dx.doi.org/10.4028/www.scientific.net/msf.944.828.
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During the processing of tubing premium threaded made up, the degree of the thread sealing surface intactness will directly affect the sealing performance of the string. Nevertheless, there are some difficulties to detect the damage of the engaged sealing surface effectively. In the present study the sealing surface damage was judged by the sealing surface contact stress’s relative changes according to the acoustic elasticity theory,. At the same time, the wear defects generated at the tubing sealing surface, during the tubing made up, contrasted with the wear and unworn surface roughness of coupling ultrasonic detected about the sealing surface. The results showed that with the acoustic amplitude evaluated the sealing contact stress was susceptible to the influence of surface roughness of coupling. But the reflection wave with the center frequency on the sealing surface characterization of the contact stress could avoid this problem effectively.
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Peng, Yan, Liang Yu Zong, Liu Feng Hao, and Qi Yang Li. "Ball Valve Seat Design Method Based on Finite Element Analysis and Calculation." Applied Mechanics and Materials 551 (May 2014): 331–36. http://dx.doi.org/10.4028/www.scientific.net/amm.551.331.
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The face of the valve seat sealing surface design, the finite element analysis and calculation of ball valve seat sealing surface and angle of the design method is studied. Through 3D CAD technology for ball valve design, guide 3D design model to finite element analysis software to calculate ,reveal the sealing load distribution of pressure in the valve seat sealing surface, sealing pressure values are obtained, through the valve seat sealing surface design Angle analysis, to obtain the optimal value of sealing surface angle.
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Qiu, Ming Xing, Jian Jun Wang, Zhen Xing Wang, and Zhan Ying Li. "Conical Surface Sealing Performance of Pipe Connection Fits." Advanced Materials Research 721 (July 2013): 564–71. http://dx.doi.org/10.4028/www.scientific.net/amr.721.564.
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The conical surface sealing performance of a pipe connection fit (PCF) has been studied by means of an equivalent mechanical model and the contact finite element analysis (FEA). By building an equivalent mechanical model, we studied the basic mechanical relations between the jointing parts, proposed a sealing mechanism, and identified a basic pretension-relaxation-leakage mode occurring in the sealing process of a conical surface PCF. Then we simulated the contact states of the PCF sealing surface using a multi-body elastic contact finite element method (FEM). In addition, the characteristics of the pretension-relaxation-leakage mode were further discussed in terms of the contact forces as well as the contact areas on the sealing surface. These results revealed some fundamental characteristics inherent in the sealing process of conical surface of PCFs, and demonstrated the potentials of the contact FEA in studying PCF sealing performance.
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Fried, Andrew, Haritha Malladi, and Cassie Castorena. "Impact of Crack Sealant on Pavement Skid Resistance." Transportation Research Record: Journal of the Transportation Research Board 2673, no. 7 (June 2, 2019): 362–70. http://dx.doi.org/10.1177/0361198119849590.
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Crack sealing is often a cost-effective preventive maintenance strategy for prolonging pavement service life when applied to pavements in relatively good condition. Crack sealing is generally ineffective for extending the life of heavily cracked pavements. However, crack sealing is often applied to pavements with extensive cracking. The application of crack sealing to pavements with extensive cracking can pose a skid resistance hazard. This study investigates the relationship between the amount and distribution of crack sealant application and pavement skid resistance. Locked-Wheel Skid Tester (LWST) testing was conducted on several pavement projects in North Carolina, United States, with varying amounts and patterns of crack sealant. Images of the locations of LWST testing were obtained and processed to determine the percentage of the pavement surface area covered by crack sealant. A relationship between the percentage of the wheel path covered by crack sealant and LWST results was established that demonstrates the application of high amounts of crack sealant to the wheel path can pose safety hazards. The effect of crack sealant on pavement skid resistance is a function of the existing pavement’s frictional characteristics. The results of this study highlight the need for the development of crack sealant specification provisions to avoid the loss of skid resistance.
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ALLMARAS, R. R. "Soil Surface Sealing and Crusting." Soil Science 158, no. 3 (September 1994): 228–30. http://dx.doi.org/10.1097/00010694-199409000-00011.
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Johnson, David R., Reed B. Freeman, and James R. Stevenson. "Cost-Effectiveness of Crack Sealing Materials and Techniques for Asphalt Pavements." Transportation Research Record: Journal of the Transportation Research Board 1697, no. 1 (January 2000): 31–40. http://dx.doi.org/10.3141/1697-06.
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Sealing or filling cracked asphalt pavements to prevent the intrusion of water into the pavement structure has long been an accepted practice of the Montana Department of Transportation. Attempts were made to establish the most economical and effective method of sealing pavement cracks for Montana and to better determine crack sealing’s role within Montana’s pavement management system (PvMS). Four experimental test sites were constructed within crack-sealing projects. The test sites included combinations of nine sealant materials and six sealing techniques. Monitoring of the test sites includes visual inspections (for all of the sites) and nondestructive structural readings and surface distress identification under Montana’s PvMS (for one test location). One expectation of the inspections is an estimation of crack sealing’s useful life. Information on project history and project methodology, including the methods used for evaluating the performance of sealed cracks, is presented. Interim conclusions are presented, most of which have been obtained from the two test sites that have been in service for 3 years. Similar performance has been observed for all materials with ASTM D5329 cone penetrations in excess of 90. In general, routing of transverse cracks improved the performance of the sealants. Routing did not appear necessary for centerline longitudinal cracks. Observations from the first year of service for the most recent installation are noted. Notably, router operators appear to prefer the shallow reservoir configuration over square reservoirs. The highest failure rates occur during the coldest period of the year, and much of this distress “heals” after exposure to the summer heat.
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Basili, Cristian P., Claes Göran Emilson, Gonzalo C. Corvalan, Maria Paz Moran, Carlos Torres, Mariela D. Quiroz, and Santiago Sergio Gomez. "Preventive and Therapeutic Proximal Sealing: A 3.5-Year Randomized Controlled Clinical Trial Follow-Up." Caries Research 51, no. 4 (2017): 387–93. http://dx.doi.org/10.1159/000470851.
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Objective: The aim of this split-mouth, randomized controlled clinical trial was to evaluate the efficacy of proximal sealing for avoiding the development of new caries lesions or arresting incipient caries lesions on the mesial surface of first permanent molars (6m) abutting lesions on the distal surface of second primary molars (05d) in children at high caries risk. Methods: A total of 61 children 8-10 years old were selected based on the caries status of the proximal sites of 05d and 6m. Children with caries on 05d and caries-free 6m were placed in the preventive sealing group and children with caries on both 05d and 6m in the therapeutic group. The children in each group had one 6m surface pair and in each pair one 6m surface was randomly allocated to receive a preventive or therapeutic sealing. Using a split-mouth design, the other 6m surface in the pair served as control. Results: After 3.5 years, standardized follow-up radiographs were obtained for the 45 children who remained. In the preventive sealing group, 4 out of 30 (13.3%) sealed and 16 out of 30 (53.3%) unsealed sound 6m surfaces had developed new caries lesions (p = 0.004, McNemar test). In the therapeutic sealing group, the progression of the carious lesions on 6m was observed in 3 out of 15 sealed (20.0%) and 8 out of 15 (53.3%) unsealed caries control surfaces (p = 0.06). Conclusions: Preventive sealing on sound 6m surfaces abutting 05d lesions in children at high caries risk efficaciously prevents the development of caries lesions. Therapeutically sealing active non-cavitated caries lesions reduces the progression.
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Kolodkina, Valentina I. "ANALYSIS OF THE CLINICAL EFFICIENCY OF RESTORATIVE FILLING MATERIALS." Kuban Scientific Medical Bulletin 26, no. 2 (May 17, 2019): 64–70. http://dx.doi.org/10.25207/1608-6228-2019-26-2-64-70.
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Aim. To conduct a clinical assessment of short- and long-term surface sealing in patients having a different hygienic status of the oral cavity.Materials and methods. For clinical trials, a group of 250 male and female patients aged 25–45 years old and diagnosed with Black’s class III and V carious lesions was selected. All patients were divided into three groups depending on the state of oral hygiene and the applied methods of aesthetic restoration: control group — defect restoration by Filtek Z-250 microhybrid composite (3M ESPE); comparison group — Filtek Z-250 restoration (3M ESPE) + Easy Glaze (Voco) surface sealing on the day of restoration; and the main group with three subgroups: 2α subgroup — Restavrin restoration + Easy Glaze sealant on the day of treatment; 2β subgroup — Restavrin restoration + Easy Glaze sealant on the day of treatment and re-sealing with a frequency of 1 time per year; 2γ subgroup — Restavrin restoration + Easy Glaze sealant on the day of treatment and re-sealing with a frequency of 1 time per 6 months. The quality of caries cavities was assessed by USPHS criteria, including anatomical shape (AS), marginal pigmentation (MP), marginal adaptation (MA), the presence of secondary caries (SC) and sensitivity (S). The evaluation was conducted on the day of the visit and following 6, 12 and 24 months.Results. A comparison of the clinical evaluation of photocomposite restorations by the Filtek Z-250 (3M ESPE) microhybrid composite in the control group of patients, in comparison group and in the main Restavrin (Technodent) group showed that the Easy Glaze (Voco) surface sealing of the Restavrin composite restorations carried out in the 2α subgroup of the main group onе time on the day of restoration, in the 2β subgroup with re-sealing after 12 months, and in the 2γ subgroup with sealing every 6 months had allowed the maximum number of restorations to be corresponded to the “satisfactory” value according to the AS, MP, MA, SC, S evaluation criteria throughout the entire observation period.Conclusion. The Restavrin (Technodent, Russia) polymeric nanohybrid fi lling material is shown to produce the most effective and durable restorations compared to other materials under study. The applicatiyon of Restavrin followed by the Easy Glaze (Voco) sealing protective system with a frequency dependent on the hygienic status of the oral cavity allows therapeutic methods for dentin caries treatment to be optimized.
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Zhou, Qi, Chun Lin He, Qing Kui Cai, and Ping Zhao. "Surface Morphologies of Sealed Film on Anodized Al Alloy." Advanced Materials Research 239-242 (May 2011): 2034–37. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.2034.
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Surface morphologies of sealed films on anodized aluminum alloy extraordinarily affect on their corrosion resistance. Two-dimensional surface morphologies and three-dimensional surface morphologies of sol sealing, sodium dichromate sealing, boiling water sealing and unsealed films were obtained by OLS3100 laser scanning confocal microscope (LSCM). The three-dimensional surface morphologies show that the amounts of pores are greatly reduced when anodized aluminum 2024 are sealed by these methods. Surface roughness of sealed anodized aluminum 2024 films is increased comparing with the unsealed films, especially the boiling water sealing film. The results of two-dimensional surface morphologies show that unsealed films have plenty of spherical particles; there are raised blocks on sol film; there are much round or chrysalis cavities inside sodium dichromate sealing and boiling water sealing film. Especially there are the most and the deepest cavities with the largest diameter on the boiling water sealing film.
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Šlanhof, Jiří, Barbora Nečasová, Pavel Liška, and Martina Šimáčková. "Verification of Sealing Possibilities of Cement – Based Structures without Additional Surface Treatment." Applied Mechanics and Materials 824 (January 2016): 164–71. http://dx.doi.org/10.4028/www.scientific.net/amm.824.164.
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The paper introduces the results of research study aimed at sealing possibilities of cement-based substrates. The intention of the presented research is to verify whether the permanent and reliable seal in materials can be implemented even without additional surface treatment. The task is approached experimentally, using test procedures based on relevant European technical standards. The tested substrate is made up of glass-fiber reinforced concrete facade elements intended for the final cladding of buildings without any further surface treatment. The selected substrate is 13 mm thick, one test sample consist of two identical pieces of substrate connected by chosen sealant. A group of ten industrially-produced, commonly available sealants by three manufacturers is included in the experimental measurements. The research brought an answer to the question of the sealing possibilities of an unprocessed structures and also solved the issue of the most suitable type of sealant meant for this purpose.
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Wang, Peng, Mei Juan Hu, Zhao Xi Shen, Lei Li, and Chun Feng. "Sealing Structure Analysis of a Non-API Tubing Connection during Load Envelope Test." Applied Mechanics and Materials 121-126 (October 2011): 1669–73. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.1669.
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In the paper, a non-API tubing connection’s sealing structure is analyzed through numerical simulation. It is very important for sealing integrity to maintain intimate and usually high contact stress of mating metal surfaces under different loading. First, the contact pressure of main sealing surface and torque shoulder surface generated by interference fit after make-up procedure is analyzed. Then, the variation of contact pressure of sealing system during the load envelope test consisting of the axial loads and internal pressure is analyzed. The analysis results can be used to optimum design and operational suitability test of non-API tubing connections.
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Zhou, Xuhui, Zhenglin Liu, Li Zou, Xingxin Liang, Huanjie Wang, and Jun Yang. "Research on Sealing Properties and its Influence Factors of Spherical Mechanical Seal Based on ANSYS." Open Mechanical Engineering Journal 10, no. 1 (September 30, 2016): 160–72. http://dx.doi.org/10.2174/1874155x01610010160.
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When a marine stern shaft is bent with shafting misalignment and stern bearing wear factors, etc., the sealing properties of a plane mechanical seal is declined with the increase of both contact pressure and temperature of sealing surface, so a spherical mechanical seal which can automatically adjust the contact state of sealing surfaces is proposed to replace the plane mechanical seal in order to solve the aforementioned problems. The sealing properties of a spherical mechanical seal is directly influenced by the sealing structure size such as sealing spherical radius, the distance between stator and rotary ring seats, inner and outer diameters of stator ring. The thermal-structure coupling model of the spherical mechanical seal in underwater vehicles is built with ANSYS finite element method, and the influence of structure size on the sealing performances of the spherical mechanical seal is discussed. The study results show that as spherical radius is increased, the contact region of spherical sealing surfaces is decreased and the opening region is expanded, and the highest temperature and maximum contact pressure on the spherical sealing surfaces are raised. As inner or outer diameter of stator ring is increased, the maximum contact pressure of the former is raised, and one of the latter is declined, but the highest temperatures of both on sealing surfaces are enhanced linearly. When the distance between static and rotary ring seats is increased, the highest temperature of sealing surface and maximum contact pressure are increased in a nonlinear way. These conclusions are of important theoretical significance and engineering application value for the structure optimization of spherical mechanical seals in vessels, particularly underwater vehicles.
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Shao, Qianqiu, Songhai Fan, and Fenglian Liu. "Research on Deep Defect Detection Method of Cable Lead Sealing Based on Improved Pulsed Eddy Current Excitation." Electronics 11, no. 15 (August 4, 2022): 2428. http://dx.doi.org/10.3390/electronics11152428.
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In order to reduce power failures caused by lead sealing defects, it is necessary to carry out nondestructive testing of cable lead sealings. However, previous studies have focused on the detection of surface and near-surface defects of lead sealings. Thus, an improved pulsed eddy current detection (IPECD) method is introduced to detect the deep defects of cable lead sealings (with depths ranging from 6 to 12 mm), and the frequency range selection principle and the optimization method of initial phase angles of different frequency components of IPECD, used to maximize the peak value of the excitation signal, are first explained in detail. Then, the detection sensitivities of the deep defects before and after the optimization are compared and analyzed based on a simulation. Finally, using the IPECD method, experiments are conducted to study the effects of the defect depth on features of the lift-off point of intersection and the zero-crossing time, enhancing the foundation for the prediction or rapid detection of the depth of lead sealing defects.
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Bauer, Niklas, and Katharina Schmitz. "Influence of Manufacturing Tolerances on the Behavior of Pneumatic Seals using EHL Simulations." Tribologie und Schmierungstechnik 69, no. 5-6 (February 15, 2023): 62–69. http://dx.doi.org/10.24053/tus-2022-0046.
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The sealing friction in pneumatic spool valves is influenced by several factors, like the lubricant and sealing material properties, the topography of the contacting surfaces and the geometry. In practice, surface roughness and geometry are subject to manufacturing tolerances. This publication presents a simulative investigation on how these tolerances affect the sealing contact. For that, friction force and leakage are calculated for different bore diameters and surface roughness. An increase in bore diameter leads to an almost linear decrease in friction and an increase in expected leakage. Higher surface roughness amplitudes are predicted to increase both friction and expected leakage.
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Gustieliev, Оleksandr. "Sealing materials effectiveness evaluation in the repair of bituminous-concrete surface with transversal cracks." ACADEMIC JOURNAL Series: Industrial Machine Building, Civil Engineering 1, no. 52 (July 5, 2019): 166–69. http://dx.doi.org/10.26906/znp.2019.52.1703.
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The method of sealing materials effectiveness evaluation in the repair of bituminous-concrete surface with transversal cracksis offered. Calculation schemes and mathematical models based on the application of the thermo-viscous-elasticity theory forthe prediction of temperature stresses in the sealing material at the contact with the bituminous-concrete surface, taking intoaccount the thermal-technical and thermorheological properties of the materials and the geometric parameters of the bituminous-concreteslabs and the transversal crack. The obtained analytical dependences allow to estimate the service life beforethe loss of sealant compound integrity or adhesive strength of their adhesion with bituminous-concrete surface taking intoaccount annual and daily temperature fluctuations according to the main provisions of the kinetic theory of solid bodiesstrength.
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D. E. Eisenhauer, D. F. Heermann, and A. Klute. "Surface Sealing Effects on Infiltration with Surface Irrigation." Transactions of the ASAE 35, no. 6 (1992): 1799–807. http://dx.doi.org/10.13031/2013.28799.
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Тихомиров, Виктор, Viktor Tikhomirov, Михаил Измеров, and Mikhail Izmerov. "IMPERMEABILITY OF METAL-METAL SEALING ARRANGEMENTS." Bulletin of Bryansk state technical university 2016, no. 1 (March 31, 2016): 89–99. http://dx.doi.org/10.12737/18269.
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A contact of machinery real engineering surfaces has a complex geometry and is defined by errors at machining, in particular, by macrodeviations, corrugation and roughness. This paper report the consideration carried out on a fluid consumption through an end axisymmetric sealing arrangement formed by a joint of metal surfaces. Sealed environment consumption is defined through a sum of leaks through a slit between surfaces conditioned on corrugation and dripping through a porous layer farmed by surface roughness on contact contour spots. The surface corrugation is modeled by splines according to initial parameters of a corrugation, and as a roughness a surface fractal model is used repeating a real roughness most accurate. On algorithms presented taking into account basic parameters of corrugation and roughness the 3D models of engineering surfaces are created and after their bringing in contact arises a possibility to obtain practically all parameters of contacting defining the impermeability of a sealing arrangement. The application of 3D models allows rendering processes passing in a contact of conjugate surfaces and obtaining some data, for instance, a tortuosity of leaking channels which earlier were chosen according to recommendations which no doubt increases computation accuracy.
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Huang, De, Xiang Yan, Roland Larsson, and Andreas Almqvist. "Numerical Simulation of Static Seal Contact Mechanics Including Hydrostatic Load at the Contacting Interface." Lubricants 9, no. 1 (December 23, 2020): 1. http://dx.doi.org/10.3390/lubricants9010001.
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A finite element model of a static seal assembled in its housing has been built and is utilized to study how the seal deforms under varying loading conditions. The total contact load on the sealing surface is balanced by the sealed fluid pressure and the friction between the seal and the housing sidewall perpendicular to the sealing surface. The effect of the sealed fluid pressure between the sealing surfaces was investigated and the simulation showed that the surface profile is distorted due to the hydrostatic pressure. We study the distorted contact profile with varying sealed fluid pressure and propose five parameters to describe the corresponding contact pressure profile. One of these parameters, overshoot pressure, a measure of the difference between maximum contact pressure and the sealed fluid pressure, is an indicator of sealing performance. The simulations performed show different behaviors of the overshoot pressure with sealed fluid pressure for cosinusoidal and parabolic surfaces with the same peak to valley (PV) value.
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Lin, Ying, Jiang Zhang, Xinhai Yu, Shijian Chen, and Yongning Guo. "Gas Leakage Evaluation of Metallic Sealing Surfaces with Annular Morphology." Journal of Physics: Conference Series 2437, no. 1 (January 1, 2023): 012008. http://dx.doi.org/10.1088/1742-6596/2437/1/012008.
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Abstract The metallic seal has been widely used in many industries, and its seal performance is the guarantee of effective and safe applications. Therefore, it needs to clarify the efforts of sealing surface morphology and leak flow on seals. Aiming at the surface of annular morphology, this paper proposes a theoretical gas leakage evaluation of metallic sealing surfaces. The anisotropic rough surfaces were used to carry out the contact analysis. From the contact model, the leak channels were extracted and then applied to the gas slip nanofluidic simulation to quantitatively evaluate the leakage. The evaluation was finally validated by leakage experiments. This provides a valuable approach to explore the influence of the surface microscopic topology and the gas leak nanofluidic flow on the sealing performances.
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Sari, Gesti Kartiko, Sri Kuswandari, and Putri Kusuma Wardani Mahendra. "Effects of tooth preparation on the microleakage of fissure sealant." Dental Journal (Majalah Kedokteran Gigi) 55, no. 2 (June 1, 2022): 67–70. http://dx.doi.org/10.20473/j.djmkg.v55.i2.p67-70.
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Background: Fissure sealing can be achieved by preparing and sealing the deep pits and fissures in the teeth with a sealant to prevent caries. Fissure sealing is performed using resin modified glass ionomer cement (RMGIC) and failure is most often due to weak adhesion between the material and the tooth, resulting in microleakage. Purpose: The study aimed to determine the effect of a preparation technique with bur and acid application on potential RMGIC fissure sealant microleakage. Methods: Twenty-four extracted maxillary premolars were divided into four treatment groups. Group 1 underwent enameloplasty with a round bur and application of 37% phosphoric acid; group 2 with a tapered bur and 37% phosphoric acid; group 3 with a round bur and 10% polyacrylic acid; and group 4 with a tapered bur and 10% polyacrylic acid. The application of 37% phosphoric acid was carried out for 15 seconds, while 10% polyacrylic acid was applied for 20 seconds, before RMGIC filling. The teeth were stored in artificial saliva at 37°C for 24 hours, then thermocycled 100 times at 5°C and 55°C for 20 seconds each. The teeth were immersed in a 1% methylene blue solution for 24 hours at 37°C, then cut crosswise. The length of the microleakage was observed with a stereo microscope at 8 times magnification and measured using raster image application. Data was analysed with one-way ANOVA. Results: Significant differences were found between treatment groups (F=562.14; p<0.05). The deepest mean microleakage was in the round bur and 10% polyacrylic acid group (1657.87 ± 78.08) and the shallowest was in the round bur and 37% phosphoric acid group (500.70 ± 38.55). Conclusion: The preparation method, type of bur and acid solution have an effect on microleakage potential of RMGIC fissure sealing. Round bur preparation and 37% phosphoric acid resulted in shallow microleakage.
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Sari, Gesti Kartiko, Sri Kuswandari, and Putri Kusuma Wardani Mahendra. "Effects of tooth preparation on the microleakage of fissure sealant." Dental Journal (Majalah Kedokteran Gigi) 55, no. 2 (June 1, 2022): 67–70. http://dx.doi.org/10.20473/j.djmkg.v55.i2.p67-70.
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Background: Fissure sealing can be achieved by preparing and sealing the deep pits and fissures in the teeth with a sealant to prevent caries. Fissure sealing is performed using resin modified glass ionomer cement (RMGIC) and failure is most often due to weak adhesion between the material and the tooth, resulting in microleakage. Purpose: The study aimed to determine the effect of a preparation technique with bur and acid application on potential RMGIC fissure sealant microleakage. Methods: Twenty-four extracted maxillary premolars were divided into four treatment groups. Group 1 underwent enameloplasty with a round bur and application of 37% phosphoric acid; group 2 with a tapered bur and 37% phosphoric acid; group 3 with a round bur and 10% polyacrylic acid; and group 4 with a tapered bur and 10% polyacrylic acid. The application of 37% phosphoric acid was carried out for 15 seconds, while 10% polyacrylic acid was applied for 20 seconds, before RMGIC filling. The teeth were stored in artificial saliva at 37°C for 24 hours, then thermocycled 100 times at 5°C and 55°C for 20 seconds each. The teeth were immersed in a 1% methylene blue solution for 24 hours at 37°C, then cut crosswise. The length of the microleakage was observed with a stereo microscope at 8 times magnification and measured using raster image application. Data was analysed with one-way ANOVA. Results: Significant differences were found between treatment groups (F=562.14; p<0.05). The deepest mean microleakage was in the round bur and 10% polyacrylic acid group (1657.87 ± 78.08) and the shallowest was in the round bur and 37% phosphoric acid group (500.70 ± 38.55). Conclusion: The preparation method, type of bur and acid solution have an effect on microleakage potential of RMGIC fissure sealing. Round bur preparation and 37% phosphoric acid resulted in shallow microleakage.
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Yang, Wen Jian, Xiao Ming Huang, Guo Liang Xu, and Xiang Kui Lv. "The Influence of Characterization of Metallic Gasket Rough Surface on Gas Sealing Performance in Seal Structure." Applied Mechanics and Materials 723 (January 2015): 162–66. http://dx.doi.org/10.4028/www.scientific.net/amm.723.162.
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To investigate the influence of the roughness characteristics of the metallic gasket on the gas leakage rate, a mathematical model of a rough surface based on the Gauss distribution function and exponential auto-correlation function was built. According to this model, a 3D geometrical model of a sealing clearance with two rough surfaces was configured. Effect of the roughness parameters on the gas sealing performance was numerical analyzed, and through the comparison with the classical smooth parallel plate leakage model, the relationship between the leakage rate and the roughness parameters of the sealing surfaces was built. Furthermore, the relationship between contact pressure and the leakage rate for the different roughness surfaces was studied based on the current model. The results show the methodology proposed in current work is effective in predicting the actual sealing performance of static seal structure.
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Nurlan Huseynli, Nurlan Huseynli. "A REVIEW OF VALVE STEM SEALING TO PREVENT LEAKAGE." ETM - Equipment, Technologies, Materials 10, no. 02 (April 2, 2022): 90–96. http://dx.doi.org/10.36962/etm10022022-90.
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Stem sealing plays an important role in valve operation, to avoid leakage from the valve. Additionally, accuracy and tight sealing of stem seals are vital in fugitive emission applications where hazardous fluids such as gases or vapours may escape if a valve is not sealed properly. Soft thermoplastic materials, Teflon (PTFE), graphite or graphoil like vitons can be used to valve stem sealing. Appropriate stem sealing or packing depends on the process conditions where the valve will be used, including being able to withstand extreme temperatures, being resistant to aggressive fluid such as H2S containing fluid, displaying a low friction factor to the stem, providing very good sealing capability to prevent leakage from the valve stem area. The sealing capability and performance of a valve can be validated by testing the valve stem sealing through mechanical and temperature cycles based on different American Petroleum Institute standards or by finite element analysis. The torque required to operate a valve depends on parameters such as the packing or stem sealing material, number of stem sealing rings, load of gland flange, stem surface finish, temperature, and cycling. Reducing the number of packing rings can reduce the valve torque but removing rings can also increase the risk of leakage from the valve. Keywords: Valve sealing, torque, valve stem friction.
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Liu, Yong, Hao Du, Xinjiang Ren, Baichun Li, Junze Qian, and Fangchao Yan. "A Leakage Rate Model for Metal-to-Metal Seals Based on the Fractal Theory of Porous Medium." Aerospace 9, no. 12 (December 1, 2022): 779. http://dx.doi.org/10.3390/aerospace9120779.
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Due to the complexity of sealing surface topography, it is difficult to take the surface topography into consideration when building a leakage rate model theoretically. Therefore, a theoretical model for estimating the leakage rate of metal-to-metal seals based on the fractal theory of porous medium, which can objectively reflect the influence of sealing surface topography from a microscopic perspective, is proposed in the present work. In the approach, fractal parameters are adopted to characterize the sealing surface. The sealing interface is supposed to be a porous medium space and the intrinsic parameters are obtained through rigorous theoretical derivation. The results show that the topography parameters of the sealing surface have a significant effect on the intrinsic parameters of the pore space and lead to a significant influence on the leakage rate of metal-to-metal seals. Specifically, the smoother the sealing surface, the lower the leakage rate of the metal-to-metal seal. Moreover, the leakage rate decreases with an increase in the contact pressure, and, if the fluid pressure difference is too large, the sealing performance will be seriously reduced. The proposed model provides a novel way to calculate the leakage rate of metal-to-metal seals.
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Song, Rong, and Fang Zheng. "Analysis of Ball Valve Sealing Pressure Ratio Based on UG Nastran." Advanced Materials Research 703 (June 2013): 204–7. http://dx.doi.org/10.4028/www.scientific.net/amr.703.204.
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According to the calculation of sealing pressure ratio in the ball valves seat sealing surface, Companies generally adopt the experience and the correction formula. The above methods can not reflect the real distribution of sealing pressure ratio in the ball valves seat sealing surface. Through the UG Nastran finite element analysis environment, This study simulates the actual working environment, precise Calculated the real distribution of Sealing pressure ratio, In order to improve the development speed and quality of enterprise's new product.
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HU, Yang, Jie ZHANG, and Li Ming CHEN. "Design and seal performance analysis of bionic sealing ring for dynamic seal." Mechanics 26, no. 4 (September 15, 2020): 338–45. http://dx.doi.org/10.5755/j01.mech.26.4.23264.
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In this paper, the non-smooth surface technology is applied to the surface structure of the rectangular sealing ring, and a bionic sealing ring is designed. Two-dimensional axisymmetric models of rectangular and bionic sealing rings were established. Effects of pre-compression amount, fluid pressure, friction coefficient and reciprocating velocity on the static and dynamic sealing performance of two sealing rings were studied. The results show that the seal performance of the bionic sealing ring is greater than that of rectangular. The static seal performance increases with the increasing of fluid pressure and compression amount. Dynamic sealing performance in outward stroke is better than it in the inward stroke. Friction coefficient has a smaller effect on the bionic sealing ring’s sealing performance than rectangular sealing ring. Therefore, using the bionic sealing ring can improve the static and dynamic seal performances and prolong its service life in hydraulic systems, rotating machinery and reciprocating machinery.
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Hu, Qiong, Jianjun Sun, and Chenbo Ma. "Thermomechanical coupled analysis of split mechanical seal under different rotation speeds." Advances in Mechanical Engineering 8, no. 12 (December 2016): 168781401667956. http://dx.doi.org/10.1177/1687814016679565.
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Numerical analysis is employed to investigate the influence of parting surface and combined thermal factor (rotation) on deformation of split mechanical seal. Parting surface takes little effect on the temperature distribution, verified by comparison experiment. Shaft rotation speed does not much affect the radial temperature gradient of the seal end faces but can raise the temperature when being increased. The simulated model turns to a drum, with the parting surfaces, close to the primary sealing interface presenting a convergent taper, becoming open-shaped. Increasing rotation dramatically intensifies the seal end face deformation of both split stationary and rotating seal rings and slightly increases the convergent taper size of the primary sealing interface. However, it takes little effect on the parting surface deformation. Compared with integral mechanical seal, parting surfaces distinctly reduce the primary sealing interface cone as well as the seal end face deformation of both split seal rings.
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Geblinger, Dafna, Christian Zink, Nicholas D. Spencer, Lia Addadi, and Benjamin Geiger. "Effects of surface microtopography on the assembly of the osteoclast resorption apparatus." Journal of The Royal Society Interface 9, no. 72 (November 16, 2011): 1599–608. http://dx.doi.org/10.1098/rsif.2011.0659.
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Bone degradation by osteoclasts depends on the formation of a sealing zone, composed of an interlinked network of podosomes, which delimits the degradation lacuna into which osteoclasts secrete acid and proteolytic enzymes. For resorption to occur, the sealing zone must be coherent and stable for extended periods of time. Using titanium roughness gradients ranging from 1 to 4.5 µm R a as substrates for osteoclast adhesion, we show that microtopographic obstacles of a length scale well beyond the range of the ‘footprint’ of an individual podosome can slow down sealing-zone expansion. A clear inverse correlation was found between ring stability, structural integrity and sealing-zone translocation rate. Direct live-cell microscopy indicated that the expansion of the sealing zone is locally arrested by steep, three-dimensional ‘ridge-like barriers’, running parallel to its perimeter. It was, however, also evident that the sealing zone can bypass such obstacles, if pulled by neighbouring regions, extending through flanking, obstacle-free areas. We propose that sealing-zone dynamics, while being locally regulated by surface roughness, are globally integrated via the associated actin cytoskeleton. The effect of substrate roughness on osteoclast behaviour is significant in relation to osteoclast function under physiological and pathological conditions, and may constitute an important consideration in the design of advanced bone replacements.
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Yeryomenkova, Irina. "A normalized method for determining the influence on the fixed joints tightness using the technology of the sealing surface job." Science intensive technologies in mechanical engineering 2021, no. 10 (October 29, 2021): 18–27. http://dx.doi.org/10.30987/2223-4608-2021-10-18-27.
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The existing approaches for determining and evaluating the sealing properties of seals for fixed sealants, as well as methods of leakage monitoring are considered. The description of a normalized method for leak-tightness assessment is given, which allows solving a sufficiently large number of evaluation tasks, for example, technological task: assessment of the influence of the technology sealing surfaced job; design: assessment of the influence of the seals surface layer quality of sealants and geometric parameters of them on sealing capacity (service property).
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Zhang, Miaotian, Decai Li, Shuangfu Suo, and Jianwen Shi. "Piston Rod Coating Material Study of Reciprocating Sealing Experiment Based on Sterling Seal." Applied Sciences 11, no. 4 (February 3, 2021): 1370. http://dx.doi.org/10.3390/app11041370.
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Sterling seal is a commonly used reciprocating seal, in which the PTFE ring of the seal and the surface material of the piston rod play an important role in the reciprocating sealing process. In this paper, a reciprocating sealing test bench was built, four sets of carbon fiber PTFE sealing rings were used to perform reciprocating sealing bench experiments with Cr-coated piston rods and DLC-coated piston rods. After the experiment, the used four sets of seals were taken as experimental samples, and a new, unused carbon fiber PTFE seal was taken as a reference sample. The surface topography, surface wear, and wear surface elements of the test specimens were measured by three-dimensional white light interference surface topography instrument, field emission environment scanning electron microscope, and field emission scanning electron microscope. Through experimental determination, it is found that the coating material is detached to form abrasive grains, which causes the surface of the sealing ring to wear. This paper also proposes optimization suggestions for the processing method of the sealing ring and the selection of the material of the piston rod coating.
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Markovic, Dejan, Bojan Petrovic, Tamara Peric, and Duska Blagojevic. "Microleakage, adaptation ability and clinical efficacy of two fluoride releasing fissure sealants." Vojnosanitetski pregled 69, no. 4 (2012): 320–25. http://dx.doi.org/10.2298/vsp1204320m.
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Background/Aim. Retention of fissure sealants and good adaptation to enamel are essential for their success. Fluoride releasing resin-based materials are widely accepted for pit and fissure sealing, but newly designed glass ionomers can serve as a good alternative. The aim of this study was to evaluate microleakage and sealing ability in vitro, and to clinically assess two fluoride releasing fissure sealants. Methods. The sample for experimental study consisted of 20 freshly extracted intact human third molars, divided in two experimental groups according to the sealing material: fluoride releasing resin-based (Heliosel F) and glass ionomer (Fuji Triage) material. Digital images and scanning electron microscope were used to assess microleakage and adaptation ability. Sample for clinical study consisted of 60 children, aged 6-8 years, with high caries risk, divided in two groups according to the sealant material. Fissure sealant was applied to all erupted, caries-free first permanent molars. Sealants were evaluated after 3, 6 and 12 months using modified Ryge criteria for retention, marginal adaptation, colour match, surface smoothness and caries. Results. Microleakage was detected in more than half of the specimen, without significant differences between the two groups (p > 0.05). Both materials exhibited acceptable sealing ability. Complete retention at the end of the observation period was 81.8% for resin-based, and 21.1% for glass-ionomer fissure sealant (p < 0.001). The presence of caries in sealed molars has been detected in one patient in both groups. During the 12-month observation period, Helioseal F demonstrated better retention, marginal adaptation and surface smoothness (p < 0.001). There were no differences between the two materials regarding caries and color match (p > 0.05). Conclusion. Both tested materials demonstrate satisfactory clinical and caries prophylactic characteristics that justify their use in contemporary preventive dentistry.
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Zhou, Wei, Chengwen Wang, Peng Fan, Yuchun Kuang, and Zongzheng Dong. "The Sealing Effect Improvement Prediction of Flat Rubber Ring in Roller Bit Based on Yeoh_Revised Model." Materials 15, no. 16 (August 11, 2022): 5529. http://dx.doi.org/10.3390/ma15165529.
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In a roller bit, the flat rubber ring (FRR) often needs to apply a certain amount of compression to ensure that its rotation and static sealing surfaces can be stably sealed. For the predicted Mises stress, values smaller than the actual Mises stress due to soft single-axis compression (SAC) stress are predicted by the Yeoh (N = 3) model. To more reasonably predict stress under the static compression of the FRR in the roller bit, the sealing effect of the FRR based on the SAC contact stress and the calculated Mises stress was evaluated by the Yeoh_revised model. Based on the assumption that hydrogenated nitrile-butadiene rubber (HNBR) is isotropic and incompressible, first, we derived the fitting formulas for three types of constitutive models and the Jacobi matrix of the Yeoh_revised model and developed hyperelastic constitutive subroutines. Simultaneously, the accuracy of three models (Yeoh, Yeoh_revised and Ogden) was evaluated by the goodness of fit (R2) to data from three kinds of tensile experiment tests. The highest R2 is 0.9771 with the Yeoh_revised model, which merges the advantages of the other two fitting models and effectively improves the Yeoh model’s soft property of SAC contact stress. Additionally, by measuring on-site FRR wear, the maximum Mises stress on the sealing surface calculated based on the Yeoh_revised model is about twice that of the Yeoh model, and the maximum Mises stress on the rotation contact sealing surface is higher than that on the outside (static sealing) surface, which makes the aging of the rotation surface more severe. Thus, it was demonstrated that, on the premise of ensuring FRR sealing contact stress, the Yeoh_revised model can more reasonably predict the sealing effect of the FRR to more precisely calculate Mises stress than the Yeoh model. This also contributes to FRR structure optimization to prolong the service life of the FRR in the roller bit.
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Karohika, I. Made Gatot, Shigeyuki Haruyama, I. Nyoman Gde Antara, I. Nyoman Budiarsa, and I. Made Dwi Budiana Penindra. "Sealing Performance Layered Metal Gasket Based on the Simulation Method." TEKNIK 41, no. 1 (May 2, 2020): 14–19. http://dx.doi.org/10.14710/teknik.v41i1.26125.
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Studies for corrugated metal gaskets are still ongoing to improve its performance. This is considered to be a single gasket with SUS304 material when contact with flanges that have greater surface roughness, reduced contact width and plastic deformed contact surfaces are incomplete and cannot fill the surface roughness of flanged flanges. The use of softer material than the base material as a surface covering material is used to improve the performance of the gasket. In this study, therefore the effect of modulus of elasticity ratio and thickness ratio on contact width and contact stress, 25A three-layer metal gasket was investigated using Finite Element Analysis. The results showed that the material with tangent modulus, Ehal = Eal / 150 had the highest slope for contact width. While the contact width of the plastic mode gasket is higher than the elastic mode gasket.
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Boháček, A., J. Šlanhof, and A. Průcha. "Resistance of a sealed joint subjected to tensile stress at different temperatures." IOP Conference Series: Materials Science and Engineering 1252, no. 1 (September 1, 2022): 012007. http://dx.doi.org/10.1088/1757-899x/1252/1/012007.
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Abstract In this paper, research on the topic of Resistance of a sealed joint subjected to tensile stress at different temperatures is presented. Tensile stress is one of the physical effects acting on conventional structures. This research specifically deals with the sealing of problematic material. Aquapanel cement board is chosen as the problematic material. This board has a large amount of fine dust particles on its surface, which prevent the sealant from adhering properly to the base material. Next, two sealants and the appropriate primers are selected. The sealants used were selected based on the manufacturer's recommendations on suitability for use in sealing cementitious materials. From these three components, the Aquapanel cement board, the sealant and the primer, test specimens are made, which are tested according to the valid European standard. The results of this test are carefully recorded and further analysed. Based on the results of this test, it is possible to recommend both tested sealants for sealing cement materials that are exposed to tensile stress at different temperatures.
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Zhigachev, Andrey O., Ekaterina A. Agarkova, Danila V. Matveev, and Sergey I. Bredikhin. "CaO-SiO2-B2O3 Glass as a Sealant for Solid Oxide Fuel Cells." Ceramics 5, no. 4 (September 21, 2022): 642–54. http://dx.doi.org/10.3390/ceramics5040047.
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Solid oxide fuel cells (SOFCs) are promising devices for electrical power generation from hydrogen or hydrocarbon fuels. The paper reports our study of CaO-SiO2-B2O3 material with composition 36 mol.% SiO2, 26 mol.% B2O3, and 38 mol.% CaO as a high-temperature sealant for SOFCs with an operating temperature of 850 °C. The material was studied as an alternative to presently existing commercial glass and glass-ceramics sealants for SOFCs with operating temperature of 850 °C. Many of these sealants have limited adhesion to the surface of Crofer 22APU steel, commonly used in these SOFCs. The present study included X-ray diffraction, dilatometric, thermal, and microstructural analysis The study has shown that the softening point of the CaO-SiO2-B2O3 glass is around 900 °C, allowing sealing of the SOFCs with this glass at convenient temperature of 925 °C. The CaO-SiO2-B2O3 glass sealant has shown excellent adhesion to the surface of Crofer 22APU steel; SEM images demonstrated evidences of chemical reaction and formation of strong interface on sealant–steel contact surface. Furthermore, the glass has shown a coefficient of thermal expansion about 8.4 × 10−6 1/K after sealing, making it thermomechanically compatible with the existing SOFC materials.
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Xing, Min Jie, Qing Xue, Shuang Fu Suo, and Chun Yan Liu. "Gas Sealing Performance Study of Metal W Shaped Seal Ring." Applied Mechanics and Materials 633-634 (September 2014): 68–73. http://dx.doi.org/10.4028/www.scientific.net/amm.633-634.68.
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Gas sealing performance of metal seal ring directly affects the security and reliability of equipment operation. Gas static seals of W-ring is taken as a study object, based on the theory of rough surface contact model and the theory of gas average flow model in the rough surface gap, the gas sealing leakage model is established to analyze the relationship between the leakage and the sealing load and surface roughness parameters.
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Cho. "A Study on Control of Sealing Robot for Cracks of Concrete Surface." Journal of the Korean Society of Civil Engineers 35, no. 2 (2015): 481. http://dx.doi.org/10.12652/ksce.2015.35.2.0481.
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Boháček, Adam, and Jiří Šlanhof. "Properties of Bonding Sealants in the Sealing of Cement-Based Materials." Key Engineering Materials 898 (August 27, 2021): 19–25. http://dx.doi.org/10.4028/www.scientific.net/kem.898.19.
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This paper describes the issue of sealing cement-based materials. These materials can also include concrete elements or cement fiber boards. For the purposes of this work, a cement fiber material is selected, namely glass. This material has good effects in terms of small dust particles on the surface, which damage the bonding sealant and the substrate. Focus on its suitability for sealing cement-based substrates. The method for determining the properties of the sealant and the properties of the stylistic joint between the sealant and the base material is the tensile test. For the purpose of this test, one representative of neutral silicones, one representative of acetate silicones and one representative for acrylic sealants shall be selected. From the results of the tensile test, it is clear that with a suitable choice of the combination of bonding sealant and primer, it is possible to seal such a problematic substrate with good results.
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Qing, Han, LiangXi Xie, Lu Li, and Chuang Jia. "Oil film thickness analysis of the sealing surface for hydraulic rotary rectangular vane actuator." Industrial Lubrication and Tribology 70, no. 8 (November 12, 2018): 1494–99. http://dx.doi.org/10.1108/ilt-01-2017-0015.
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Purpose This paper aims to establish a numerical model to calculate contact pressure for rectangular vane sealing surface of hydraulic rotary actuator. Numerical model can be applied to solve the steady-state Reynolds equation after the oil film thickness and the contact pressure distribution curve of the vane sealing surface are obtained. Design/methodology/approach The authors established the numerical model of contact pressure base on the theory of elastic after, the Reynolds equation is solved by the inverse solution. Findings The relationship between the oil film thickness of vane sealing surface and the contact pressure on different sealing location for hydraulic rotary actuator is obtained. At the same time, the lubrication state on the surface of seal is also found when the hydraulic rotary actuator runs stably. Originality/value The study shows that the lubricating state of the vane sealing surface is mixed lubrication, when the rotor of the hydraulic rotary actuator is running stably at a certain speed. Meanwhile, this research will provide a theory basis for later experiment for the hydraulic rotary vane actuator.
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Zhang, Qiang, Xiaoqian Chen, Yiyong Huang, and Xiang Zhang. "An Experimental Study of the Leakage Mechanism in Static Seals." Applied Sciences 8, no. 8 (August 19, 2018): 1404. http://dx.doi.org/10.3390/app8081404.
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This paper investigates the fluidic leak rate through sealing contact surfaces by comparison between model calculation and experiment measurement. The focus is on an experimental device designed to measure the leak rate of the static seals with a simpler structure, smaller errors, stronger stability, and more functions. Using the device, experiments were carried out to four test pieces with different surface characteristics, whose leak rates were measured separately. Compared with the calculation results obtained from the fractal surface leak rate prediction model, the correctness and the application range of the model were verified, and the effects of different surface topographies and material properties of the four test pieces on the leak rate were analyzed as well. The experimental device was also used to perform single-factor comparison experiments, which were then combined with the theoretical prediction model to analyze the effects of the sealing surface contact load, fluid pressure, and surface apparent size on the leak rate, so that theoretical support and experimental evidence for selecting the parameters of sealing device was provided.
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Schoberleitner, C., V. M. Archodoulaki, T. Koch, S. Lüftl, L. A. Mateos, M. Vincze, M. Werderitsch, and G. Kuschnig. "Development of a sealing material and robot for automatic socket rehabilitation of grey cast iron pipes in drinking water supply systems." Water Supply 13, no. 4 (August 1, 2013): 924–31. http://dx.doi.org/10.2166/ws.2013.058.
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The project DeWaLoP, led by Vienna Water, aims to develop a robot that is able to apply a sealing system to repair the joint sockets of pressure operating water pipes measuring about 1 m in diameter. To do this, a modification of the sealing material for inner surface application will be developed and a complex robot system will be designed to perform various tasks, such as inspecting, cleaning and restoring. Seven commercial sealing materials with a broad spectrum of mechanical and physical properties were tested. For this purpose, a series of tests was carried out to measure tensile strength, bending and adhesion; in addition, dynamic mechanical analyses, differential scanning calorimetry and thermogravimetric analyses were also conducted. A change in the mechanical and physical properties of these materials after water exposure could be observed. Furthermore, the surface preparation and remaining contaminants, e.g. rust, can affect the adhesion properties of the sealant. The plan is to develop a formulation of a matched material based on the results of these tests and the existing knowledge about the behaviour of sealing materials. The proposed in-pipe robot consists of three main subsystems: a control station, a mobile robot (similar to a vehicle) and a maintenance unit with a redevelopment system. An operator controls the movement of the cable-tethered robot system remotely from outside the construction side.
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Kim, Bongjun, Junho Suh, Bora Lee, Yondo Chun, Geuntae Hong, Jungjoon Park, and Yonghun Yu. "Numerical Analysis via Mixed Inverse Hydrodynamic Lubrication Theory of Reciprocating Rubber Seal Considering the Friction Thermal Effect." Applied Sciences 13, no. 1 (December 22, 2022): 153. http://dx.doi.org/10.3390/app13010153.
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This study investigates how operating conditions such as ambient temperature and sealing pressure affect sealing performance for a typical U-cup seal. The developed analysis method combines inverse fluid lubrication (IHL) theory and the Greenwood–Williamson contact model (G–W model), and the effect of increasing surface temperature due to frictional heat generated between two surfaces is considered. Commercial FE software (ABAQUS) was used to simulate the interference fit analysis of rubber seals and the pressurized process. Through this model, the film distribution, working fluid leakage, and friction force in the sealing area were discussed according to the operating parameters, such as sealed pressure, rod velocity, and ambient temperature. The simulation results demonstrate the effect of fluid viscosity on oil film formation (which varies with ambient temperature), the effect of increasing the surface temperature, and the effect of surface roughness at a very small film thickness.
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Mehin Baghirova, Mehin Baghirova, and Shahriyar Mammadov Shahriyar Mammadov. "INCREASE THE RELIABILITY OF A WELL HEAD." ETM - Equipment, Technologies, Materials 09, no. 01 (January 22, 2022): 88–95. http://dx.doi.org/10.36962/etm0901202288.
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The article describes the completion of drilling a well, lowering and cementing the production line, as well as after digging the cement plug in the casing (the height of the rise of the cement behind the belt if it is determined that there is a cement plug in the casing when determining with an electric thermometer)used to hang safety belts during wellhead equipment information on casing heads, their types and the study of the sealing element. Keywords: casing head, casing hanger, hermetic knots, casing spool, rubber sealant, metal sealant.
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Radcliffe, D. E., L. T. West, R. K. Hubbard, and L. E. Asmussen. "Surface Sealing in Coastal Plains Loamy Sands." Soil Science Society of America Journal 55, no. 1 (January 1991): 223–27. http://dx.doi.org/10.2136/sssaj1991.03615995005500010038x.
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REN, Xiao. "Gas Sealing Performance Study of Rough Surface." Journal of Mechanical Engineering 46, no. 16 (2010): 176. http://dx.doi.org/10.3901/jme.2010.16.176.
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Lu, K., and T. Jin. "Surface devitrification of high temperature sealing glass." Materials Research Innovations 15, no. 6 (November 2011): 386–90. http://dx.doi.org/10.1179/1433075x11y.0000000023.
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