Relevant bibliographies by topics / Other mechanical engineering, n.e.c

Academic literature on the topic 'Other mechanical engineering, n.e.c'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Other mechanical engineering, n.e.c"

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Feng, Xiu Mei, Xiao Qing Lian, Ming Xue Jiang, and Yi Ner He. "Microstructure and Mechanical Properties of In Situ Al2O3- Ti(C,N) Composites." Advanced Materials Research 239-242 (May 2011): 1243–47. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.1243.

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Al2O3-Ti(C,N)composite ceramics were prepared by in situ aluminothermic reduction and pressureless sintering. The effects of different Ti(C,N) contents and sintering temperatures on microstructure and mechanical properties (bulk density ,apparent porosity and blending strength)of samples were investigated through experiments.The results show that Al2O3-Ti(C,N) composite ceramics with 10 wt.% Ti(C,N) prepared using titanium dioxide and metal aluminum powder as raw materials and sintered at 1300 °C for 3h under a flowing nitrigen stream have good properties ,with bulk density 2.94g/cm3,apparent porosity 26.4%, and blending strength reaches to 28.04 MPa. According to the microstructure analysis,the fine in situ synthesis Ti(C,N) particles are uniformly dispersed in tabular alundum matrix. Ti(C,N) and tabular alundum phases are closely combined and can inhibit grain growth each other,which is benefical in improving the comprehensive properties of composite ceramics.
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Qasrawi, A. F. "Performance of the Yb/n-CdSe/C Tunneling Barriers." Journal of Nanoelectronics and Optoelectronics 13, no. 10 (October 1, 2018): 1493–98. http://dx.doi.org/10.1166/jno.2018.2379.

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In this article, the design and performance of the CdSe which are deposited onto thin films of Yb metal is reported and discussed. The thin films of CdSe which are deposited by the physical vapor deposition technique are observed to exhibit slightly deformed hexagonal polycrystalline nature with excess amount of Cd as confirmed by the X-ray, energy dispersive X-ray spectroscopy and scanning electron microscopy techniques. The n-type CdSe is also found to form a Schottky barrier of tunneling type when sandwiched between Yb and carbon. The quantum mechanical tunneling mechanism in this device which was tested and modeled in the frequency domain of 10–150 MHz is found to exhibit average intersite separations of ∼5 nm. The tunneling device exhibited a widening in the depletion region associated with significantly large capacitance tunability in the studied frequency domain. On the other hand, as an optoelectronic device, the Yb/n-CdSe/C Schottky diode exhibited a responsivity of ∼0.10 A/W, photosensitivity of 6.5 × 104 and external quantum efficiency of 54% when biased with 1.0 V and exposed to laser light of wavelength of 406 nm.
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Wang, Yao Ning, Xi Cheng Zhao, and Hong Zhou Ma. "High Temperature Deformation Mechanical Model and Processing Map of Ti-6Al-2Zr-1Mo-1V Alloy." Advanced Materials Research 199-200 (February 2011): 1988–92. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.1988.

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Based on the high temperature compression simulation experiments, the mechanical behavior of Ti-6AI-2Zr-1Mo-1V alloy were studied over the range of temperature from 850°C to 1100°C , strain rate from 0.01 to 10s-1. The results show that the flow stress reduces with temperature increasing at the constant strain rate and increases rapidly with strain rate increasing at the constant temperature. The stress index n and deformation activation energy Q is respectively 7.0874 and 610.463 kJ/mol at 850-950°C . While at 950-1100°C , n is 4.7324 and Q is 238.030 kJ/mol. From the obtained processing map, it is found that two unstable regions present at the lower temperature or higher strain rate and two optimum regions in hot deformation process. The unstable zones are 850-950°C , 0.001-0.008s-1of strain rate, and 940-1030°C , 2-10s-1of strain rate respectively. In the optimum zone with the temperature range of 1060-1100°C , strain rate of 0.05-0.65s-1, and the peak efficiency of power dissipation of about 0.42; while in the other zone with the deformation temperature 890-940°C , strain rate of 0.06-0.18s-1, and the peak efficiency of power dissipation of about 0.33.
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Jiao, W. Y., R. Hu, S. H. Han, Y. F. Luo, H. M. Yuan, M. K. Li, and H. J. Liu. "Surprisingly good thermoelectric performance of monolayer C3N." Nanotechnology 33, no. 4 (November 2, 2021): 045401. http://dx.doi.org/10.1088/1361-6528/ac302c.

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Abstract The rapid emergence of graphene has attracted numerous efforts to explore other two-dimensional materials. Here, we combine first-principles calculations and Boltzmann theory to investigate the structural, electronic, and thermoelectric transport properties of monolayer C3N, which exhibits a honeycomb structure very similar to graphene. It is found that the system is both dynamically and thermally stable even at high temperature. Unlike graphene, the monolayer has an indirect band gap of 0.38 eV and much lower lattice thermal conductivity. Moreover, the system exhibits obviously larger electrical conductivity and Seebeck coefficients for the hole carriers. Consequently, the ZT value of p-type C3N can reach 1.4 at 1200 K when a constant relaxation time is predicted by the simple deformation potential theory. However, such a larger ZT is reduced to 0.6 if we fully consider the electron–phonon coupling. Even so, the thermoelectric performance of monolayer C3N is still significantly enhanced compared with that of graphene, and is surprisingly good for low-dimensional thermoelectric materials consisting of very light elements.
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Xue, Lin, Qiang Miao, Wenping Liang, Hui Zhao, Weiwei Shi, Shiwei Zuo, and Hanchun Ma. "Effect of shot peening on the wear behavior of Ti(C,N) coating on TA15 alloy prepared by double glow plasma carbonitriding." Industrial Lubrication and Tribology 73, no. 3 (January 25, 2021): 443–49. http://dx.doi.org/10.1108/ilt-07-2020-0283.

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Purpose The purpose of this paper is to prepare Ti(C,N) coatings on TA15 treated and not treated by shot peening using double glow plasma alloying technique. The effect of shot peening on the wear behavior of Ti(C,N) coatings is discussed. Design/methodology/approach The Ti(C,N) coatings were prepared by double glow plasma alloying technique on two different TA15 substrate; one is shot peened and the other is not. Findings Ti(C,N) coating on SP-treated TA15 was thicker and denser, and the grain size was smaller compared with that on original TA15. Compared with the Ti(C,N) coating on original TA15, the wear resistance of that on SP-treated TA15 is improved. Ti(C,N) coating on SP-treated TA15 showed higher nanohardness and bearing capacity than that on original TA15. Originality/value For double glow plasma alloying technique, surface quality, surface activity and other factors will have influence on the thickness and density of the coating. The wear mechanisms of Ti(C,N) coating on original TA15 are serious abrasive wear and oxidation wear. However, the wear mechanism of Ti(C,N) coating on SP-treated TA15 is slightly oxidation wear. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0283/
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Ma, Yong Jie, and Guang Liang Zhang. "Effect of the HTP to X80 Ferrite Steel Structure and Mechanical Properties." Advanced Materials Research 189-193 (February 2011): 4216–20. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.4216.

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The structure and mechanical properties of pipeline steel X80 through HTP rolled into 16mm thick slab were tested. The results show that the yield strength of tested has reached above 600Mpa, and the ratio of tensile strength to yield strength is 0.86, and duetile brittle transition temperature is lower than -60°C , and good strength and toughness are obtained. Low content of P, S, high content of Mn and fine microstructure have good effect on reducing the ductile-brittle transitiop temperature. Two different precipitations are observed in pipeline steel X80, a class of TiN precipitations is mainly and a small number of (Nb, V)(C, N) complex precipitations in the TiN around, and the other for large number of NbC precipitations and a small amount of TiC、VC and simultaneous deposition of the complex formed precipitations. Remarkable strengthening and grain refinement can ne caused by these precipitations.
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de Koning, A. C., J. D. Harston, K. D. Nayler, and R. K. Ohm. "Feeling Free Despite LBZ." Journal of Offshore Mechanics and Arctic Engineering 112, no. 2 (May 1, 1990): 115–26. http://dx.doi.org/10.1115/1.2919845.

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It is sometimes argued that the occurrence of local brittle zones (LBZs) is a new phenomenon relevant only to modern low-carbon steels, while others claim that such LBZs are also present in the heat-affected zones of the C-Mn steels of the late sixties/seventies. In order to elucidate on this matter, both an “old” normalized (N) steel (1970s) and two modern low-carbon types of steel, normalized (N) and controlled rolled-accelerated cooled (CONRAC) have been investigated and compared with each other. In addition, consideration has been given to the correlation between the level of heat input during welding and the occurrence of local brittle zones. This has led in practice to a restriction of the heat input to 3.5 kJ/mm maximum for the modern low-carbon normalized steel investigated, which was used in recent projects. Furthermore, the engineering significance of LBZs is considered in the light of design aspects. It is concluded that there is little reason for concern with respect to a detrimental effect of LBZs in tubular connections of offshore structures, which is supported by a satisfactory performance of the latter to date.
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Lu, Y. H., and Y. G. Shen. "Effect of carbon content on thermal stability of Ti–Cx–Ny thin films." Journal of Materials Research 23, no. 3 (March 2008): 671–78. http://dx.doi.org/10.1557/jmr.2008.0082.

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A series of Ti–Cx–Ny thin films with solid-solution and nanocomposite structures were deposited at 500 °C by reactive, unbalanced, direct-current magnetron sputtering. These films were subsequently vacuum annealed at 600, 700, 800, 900, and 1000 °C for 1 h. The effect of C content on the thermal stability of Ti–Cx–Ny thin films was investigated by way of studying the nanostructure and mechanical behaviors of pre- and postannealed samples using x-ray diffraction, high-resolution transmission electron microscopy, Raman spectroscopy, and microindentation measurements. The result indicated that C content played a great role in the nanostructure of Ti–Cx–Ny thin films. A small amount of C fully dissolved in the TiN lattice and produced SS Ti(N,C) thin films. Nanocomposite nanocrystalline (nc)-Ti(N,C)/amorphous-(C, CNx) thin films were followed to be formed with the incorporation of more C. On the other hand, the addition of C had a positive effect on the structural stability of Ti–Cx–Ny thin films. This effect was further enhanced after the formation of a nanocomposite structure. However, neither C content nor film structure had an effect on the thermal stability of mechanical behaviors. Both microhardness and residual stress were successively decreased with temperature and did not show any temperature retardation. The decrease in hardness values was found to be attributed to a decrease of residual compressive stress because of defect annihilation and an increase in nc size.
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Hull, B. A., S. E. Mohney, and Z.-K. Liu. "Thermodynamic modeling of the Ni–Al–Ga–N system." Journal of Materials Research 19, no. 6 (June 2004): 1742–51. http://dx.doi.org/10.1557/jmr.2004.0218.

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Isothermal sections in the Ni–Al–Ga–N quaternary phase diagram were calculated to provide a greater understanding of interfacial reactions between Ni contacts and AlxGa1−xN. The calculations were performed employing a thermodynamic database of the Ni–Al–Ga–N system that was constructed by combining the six binary systems of the four component system. The model of the Ga–N binary system was created in this work. The models of the Ni–Ga and Ni–Al systems, both of which were taken from the literature, were modified to be compatible with one another. Thermodynamic data and phase boundaries for other binary systems were taken from the literature, as was information on portions of the Al–Ga–N and Ni–Al–Ga phase diagrams. The calculated sections reveal that during reaction between Ni and AlxGa1−xN, Ni is favored to react with the GaN component of the semiconductor alloy, leaving an Al-enriched AlxGa1−xN. These predictions are consistent with a recent analysis of the Ni, Al, and Ga elemental distributions across the interface between a Ni thin film and an Al0.47Ga0.53N epitaxial layer following annealing at 850 °C. Consideration of the thermodynamic driving forces suggests that this may be a general phenomenon existing in other metal–Al–Ga–N systems.
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Essafti, A., C. Gómez-Aleixandre, J. L. G. Fierro, M. Fernández, and J. M. Albella. "Chemical vapor deposition synthesis and characterization of co-deposited silicon–nitrogen–boron materials." Journal of Materials Research 11, no. 10 (October 1996): 2565–74. http://dx.doi.org/10.1557/jmr.1996.0322.

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Si–N–B films have been deposited by LPCVD from SiH4/B2H6/NH3 gas mixtures. The influence of the temperature and the composition of the gas mixture on the deposition process and film properties has been investigated. At 1000 °C, for the highest ammonia flow rate (SiH4 :B2H6 : NH3, 10 : 25 : 500), a mixture of turbostratic boron nitride and silicon nitride was deposited. For decreasing ammonia flow rates the Si–N–B ternary system was formed (1260 cm−1 band in the infrared spectra), which co-exists with the unstable turbostratic boron nitride structure. Finally, for a low NH3 flow rate of 100 sccm, stable amorphous films are obtained. On the other hand, at 800 °C, stable films with a high content in the ternary Si–N–B compound were obtained for a wide range of ammonia concentrations (100–500 sccm). At this temperature (800 °C), the composition of the films, as measured by Auger and photoelectron spectroscopies, strongly depends on the [SiH4]/[B2H6] ratio in the gas mixture. The improvement in the mechanical and chemical properties of the samples has been associated with the increase in the content of Si–N bonds in the Si–N–B films.
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Dissertations / Theses on the topic "Other mechanical engineering, n.e.c"

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Bejarano, Roberto Villa. "An Investigation Into| I) Active Flow Control for Cold-Start Performance Enhancement of a Pump-Assisted, Capillary-Driven, Two-Phase Cooling Loop II) Surface Tension of n-Pentanol + Water, a Self-Rewetting Working Fluid, From 25 ?C to 85 ?C." Thesis, University of Nevada, Reno, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1565813.

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Cold-start performance enhancement of a pump-assisted, capillary-driven, two-phase cooling loop was attained using proportional integral and fuzzy logic controls to manage the boiling condition inside the evaporator. The surface tension of aqueous solutions of n-Pentanol, a self-rewetting fluid, was also investigated for enhancing heat transfer performance of capillary driven (passive) thermal devices was also studied. A proportional-integral control algorithm was used to regulate the boiling condition (from pool boiling to thin-film boiling) and backpressure in the evaporator during cold-start and low heat input conditions. Active flow control improved the thermal resistance at low heat inputs by 50% compared to the baseline (constant flow rate) case, while realizing a total pumping power savings of 56%. Temperature overshoot at start-up was mitigated combining fuzzy-logic with a proportional-integral controller. A constant evaporator surface temperature of 60°C with a variation of ±8°C during start-up was attained with evaporator thermal resistances as low as 0.10 cm2–K/W. The surface tension of aqueous solutions of n-Pentanol, a self-rewetting working fluid, as a function of concentration and temperature were also investigated. Self-rewetting working fluids are promising in two-phase heat transfer applications because they have the ability to passively drive additional working fluid towards the heated surface; thereby increasing the dryout limitations of the thermal device. Very little data is available in literature regarding the surface tension of these fluids due to the complexity involved in fluid handling, heating, and experimentation. Careful experiments were performed to investigate the surface tension of n-Pentanol + water. The concentration and temperature range investigated were from 0.25%wt. to1.8%wt and 25°C to 85°C, respectively.

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Wilson, Zachary David. "Flight Test Data System for Strain Measurement." DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/2121.

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This thesis describes the design and evaluation of two devices to be included in the next generation of the family of devices called the Boundary Layer Data System (BLDS). The first device, called the Quasi-Static Strain Data Acquisition System, is a continuation of the BLDS-M series of devices to be known as the Flight Test Data System (FTDS) that uses a modular approach to acquire non-flow, quasi-static mechanical strain measurements. Various breakout boards and development boards were used to synthesize the device, which were housed by a custom PCB board. The system is controlled by the SimbleeTM System on a Chip (SOC), and strain measurements are acquired using the HX711 analog-to-digital converter (ADC), and acceleration measurements are acquired with the ADXL345 accelerometer. The Arduino IDE was used to program and troubleshoot the device. The second device, called the Dynamic Strain Data Acquisition System, is a laboratory proof-of-concept device that evaluates various methods of acquiring dynamic strain measurements that may be used in future FTDS designs. A custom PCB board was designed that houses the microcontroller and the various passive components and ICs used to acquire and store strain measurements. The system is controlled by the Atxmega128A4U microcontroller, and measurements are acquired using the AD7708 external ADC and the on-board ADC of the microcontroller. Atmel StudioTM was used to program the microcontroller in C/C++ and to troubleshoot the device. Both devices were tested extensively under room temperature and low temperature conditions to prove the reliability and survivability of each device. The quasi-static data acquisition system was validated to acquire and store measurements to a microSD card at 10 Hz, with a peak operating current under 60 mA. The dynamic data acquisition system was proven to acquire a thousand measurements at 1 kHz and store the data to a microSD card, with a peak operating current under 60 mA.
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Herbert, Joseph Ames. "The molecular and mechanical mechanisms of the age-associated increase in the severity of experimental ventilator induced lung injury." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4478.

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Abstract Background The majority of patients requiring mechanical ventilation are over the age of 65 and advanced age is known to increase the severity of ventilator-induced lung injury (VILI) and mortality. However, the mechanisms which predispose aging ventilator patients to increased mortality rates are not fully understood. Pulmonary edema is a hallmark of VILI and the severity of edema increases with age. Ventilation with conservative fluid management decreases mortality rates in acute respiratory distress (ARDS) patients, but has not been investigated in VILI. We hypothesized that age-associated increases in pulmonary edema promote age-related increases in ventilator-associated mortality. Endoplasmic reticulum (ER) stress can disrupt cellular functions and plays a key role in many disease states. The severity of ER stress also increases with age. We hypothesized that age-associated increases in ER stress also increase in the severity of VILI. Finally, serum Vitamin C (VitC) levels also decrease with age. VitC treatments have been shown to decrease mortality rates in murine models of ARDS by and attenuate pulmonary edema. We hypothesize that VitC treatments will attenuate ventilator induced pulmonary edema in our aged murine subjects. Methods Mechanical Ventilation: Young and old mice were mechanically ventilated with either high tidal volume (HVT) or low tidal volume (LVT) for with either liberal or conservative fluid support. One group received VitC treatment prior to ventilation. Cell Stretch: Alveolar epithelial cells (ATIIs) from young and old mice were harvested, cultured, and mechanically stretched. Treatment groups received ER stress inhibitor 4-PBA. Results Both advanced age and HVT ventilation significantly increased inflammation, injury, and decreased survival rates. Conservative fluid support significantly diminished pulmonary edema decreased mortality rates. VitC treatments significantly decreased pulmonary edema and improved pulmonary mechanics. Mechanical stretch promoted ER Stress and upregulated proinflammatory gene expression and secretion in aged ATIIs. ER stress inhibition attenuated all of these effects. Conclusion Conservative fluid management alone attenuated age-associated increases in ventilator-associated mortality. VitC treatments decreased pulmonary edema and partially restore pulmonary mechanics in old mice ventilated with HVT. ER stress inhibition decreased stretch induced proinflammatory gene expression and protein secretion in aged mechanically stretched ATII cells.
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Rahil, Issam. "Elaboration et caractérisation de revêtements à base de nitrure de chrome, carbonitrure et carbure de titane élaborés par pulvérisation magnétron." Phd thesis, Ecole nationale supérieure d'arts et métiers - ENSAM, 2013. http://pastel.archives-ouvertes.fr/pastel-00967251.

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Le but de ce travail est d'élaborer de nouveaux revêtements anti-usure à base de nitrure de chrome, de carbure et de carbonitrure de titane par dépôt physique en phase vapeur afin d'améliorer la résistance à l'usure à sec des outils de coupe du bois.Des revêtements binaires de CrN et de MoN, ternaires de Cr-Mo-N et de Ti-W-C et quaternaires de Ti-W-C-N ont été déposés sur des outils de coupe en carbure de tungstène et en acier et sur des substrats de silicium par pulvérisation magnétron RF en utilisant différentes cibles (Cr, Mo, Ti et WC) sous différentes atmosphères (Ar, Ar + N2, Ar + CH4 et Ar + N2 + CH4).L'influence de la pression de travail, des ratios des gaz plasmagènes, des tensions d'auto-polarisation des cibles, de la température des substrats et de celle du recuit sur les propriétés des revêtements ont été étudiées, en utilisant l'EDS, la WDS, l'XPS, la DRX, le MEB, le MET, l'AFM, la microscopie optique, l'interférométrie optique (2D et 3D), le Scratch test, l'essai Daimler, la nanoindentation et la tribométrie alternative et rotative. L'objectif est d'établir une corrélation entre le comportement tribologique des revêtements étudiés et leurs propriétés physico-chimiques et mécaniques.Les revêtements optimaux présentant la meilleure résistance à l'usure à sec ont été testés en usinage de l'épinette noire à l'échelle industrielle dans des conditions sévères (-20/-25 °C). Les résultats montrent que grâce à l'emploi des revêtements de Cr-Mo-N, Ti-W-C et de Ti-W-C-N, la durée de vie des outils coupants a été augmentée de 47 à 77 % par rapport à l'outil non revêtu.Mots clés: revêtement, (Cr-Mo)N, (Ti-W)(C,N), propriétés physico-chimiques, propriétés mécaniques, comportement tribologique, usinage bois
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Rydén, Gustav, and Fredrik Anarp. "Beräkningsmodell för slagtider av pneumatiska manöverdon : En experimentell och teoretisk studie av beteendet för pneumatiska cylindrar samt manöverdon." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166356.

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Denna rapport redogör framtagningen av en beräkningsmodell för slagtider av pneumatiska cylindrar och manöverdon. Slagtiderna för ett manöverdon kan bestämmas genom experimentella tester. För att underlätta och minska tiden som krävs i samband med testerna skapas en beräkningsmodell som presenterar teoretiska värden för slagtiderna. Denna beräkningsmodell stämmer kvalitativt överens med de experimentella tester som också genomförs i detta arbete. Testerna genomförs först på en enkel pneumatisk cylinder vilket bidrar till kunskaper om slagkarakteristik och slagtider. Denna kunskap är till hjälp för utveckling av beräkningsmodellen. Under testerna mäts bland annat slagtid, kammartryck och kolvens förflyttning vid en mängd olika driftförhållanden. Testerna visar att en av de mest kritiska parametrarna för beräkningsmodellen är C-värdet, en parameter som beskriver flödeskarakteristiken för pneumatiska komponenter. För att få beräkningsmodellen att fungera väl behöver ett så korrekt C-värde som möjligt användas. Beräkningsmetodiken består i stora drag av samband för fyllning och tömning av pneumatiska volymer samt tryckförändringar i cylinderkamrarna vid kompression och expansion. Med en kombination av dessa ekvationer är det möjligt att beräkna slagtiden. Eftersom beräkningsmodellen vill hållas relativt enkel görs ett antal antaganden om systemets parametrar. Dessa antaganden utvärderas efter deras påverkan på slagtiden. Validering mot experimentella resultat visar att beräkningsmodellen generellt fungerar bättre vid höga matningstryck och kritiska flöden. När matningstrycket är lågt och underkritiska flöden erhålls påverkas slagtiden av många fler parametrar, vilket gör att beräkningsmodellen får något sämre precision. Detta resultat är inte helt oväntat eftersom sambandet för kritiskt flöde är relativt enkelt.
This thesis work describes the development of a calculation model for stroke times of pneumatic cylinders and actuators. The stroke time of an actuator can be determined by experimental tests. To facilitate and reduce the time required in connection with the tests, a calculation model is created which presents theoretical values of the stroke time. This calculation model is qualitatively consistent with the experimental tests carried out in this work. The tests are first carried out on a simple pneumatic cylinder, which contributes to knowledge of stroke characteristics and stroke times. This knowledge is helpful for the development of the calculation model. During the tests the stroke time, chamber pressure and piston movement are measured in a variety of operating conditions. The tests show that one of the most critical parameters for the calculation model is the C value, a parameter that describes the flow characteristics of pneumatic components. To make the calculation model reliable, a reasonable C value need to be used. The calculation method consists largely of equations for filling and emptying of pneumatic volumes as well as pressure changes in the cylinder chambers during compression and expansion. With a combination of these equations it is possible to calculate the stroke time. Since the calculation model wants to be kept relatively simple, several assumptions are made about parameters in the system. These assumptions are evaluated according to their potential and impact on the stroke time. Validation experiments show that the calculation model generally works better at high supply pressures and critical flows. When the supply pressure is low and subcritical flow are obtained, the stroke time is affected by many more parameters, which lower the precision of the calculation model. This result is not entirely unexpected since the critical flow equations are relatively simple.
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Book chapters on the topic "Other mechanical engineering, n.e.c"

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Jang, Chul Sik, Young Rae Cho, Myung Chang Kang, Won Sub Chung, and Kwang Ho Kim. "Microstructure and Mechanical Properties of Cr-C-N, Cr-Si-N and Cr-Si-C-N Coatings by a Hybrid Coating System." In Key Engineering Materials, 2224–27. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.2224.

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Liu, Wen Jun, Yong Zheng, and Wei Hao Xiong. "Microstructures and Mechanical Properties of Nano-Composite Ti(C,N)-Based Cermets." In Key Engineering Materials, 1214–17. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.1214.

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Zhoul, Yu, Zhi-Hua Yang, De-Chang Jia, and Xiao-Ming Duan. "Microstructure and High-Temperature Properties of SI-B-C-N Ma-Powders and Ceramic." In Mechanical Properties and Performance of Engineering Ceramics and Composites V, 37–50. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470944127.ch5.

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Zhang, Lijun, Guo Qi, Jingjie Kang, Shengming Tang, Yuandong Sun, and Ruolan Wang. "Fatigue Life Calculation of Mechanical Seal Welded Metal Bellows." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220446.

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For welded metal bellows, bellows are used in mechanical seals to replace springs and other auxiliary sealing coils in seals. When the traditional rotating device rotates at a high speed, the moving ring in the mechanical sealing process will cause the axial displacement, and the bellows can compensate or reduce by relying on its own performance. For other mechanical devices, the failure of mechanical seals will directly affect their performance and life, and the failure of welded metal blowers used in mechanical seals is usually considered as fatigue damage. Therefore, studying the welding process of the bellows is extremely important to its service life. This article mainly studies the fatigue life of mechanical seal welded metal bellows. First, the characteristics of mechanical seal welded metal bellows are described by the literature research method, and then the fatigue life calculation method is summarized. Finally, the use of the experimental research method studied the fatigue life of u-shaped metal bellows and v-shaped metal bellows at temperature differences of 3°C, 4°C, 5°C, and 6°C. The experimental results show that as the temperature difference increases, the minimum fatigue life of the two types of metal bellows decreases with decline. At the same time, it can also be found that the minimum fatigue life of the v-shaped metal bellows has always far exceeded U-shaped metal bellows.
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Nailwal, Beena, and S. B. Singh. "Reliability Analysis of Two Dissimilar-Cold Standby Redundant Systems Subject to Inspection with Preventive Maintenance Using Copula." In Mathematical Concepts and Applications in Mechanical Engineering and Mechatronics, 201–21. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1639-2.ch010.

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The objective of this chapter is to study the system reliability through redundant component and additional preventive maintenance of operative and standby units. The considered system consists of two units in cold-standby, one is main unit and other is standby. The configuration of main unit is of 1-out-of-2: G whereas standby unit is of (n-1)-out-of-n: F and (n-2)-out-of-n: D nature. Main unit of the system has two modes viz. operable and failed and standby unit of the system has three modes viz. operable, degraded and failed. Both units after failure go for inspection where the type of the failure is detected and accordingly repairing action is decided. The failure and repair times follow exponential and general time distributions respectively. The system is studied by using the supplementary variable technique, Laplace transformation and Gumbel-Hougaard family of copula to obtain reliability, availability, downtime, busy period, M.T.T.F. and cost effectiveness of the system. At last some special cases of the system have been discussed.
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Taber, Douglass. "Stereocontrolled Construction of C-N Rings: The Vanderwal Synthesis of Norfluorocurarine." In Organic Synthesis. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199764549.003.0056.

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Forrest E. Michael of the University of Washington described (Organic Lett. 2009, 11, 1147) the Pd-catalyzed aminative cyclization of 1 to the differentially-protected diamine 3. Peter Somfai of KTH Chemical Science and Engineering observed (Organic Lett. 2009, 11, 919) that [1,2]-rearrangement of 4 proceeded to deliver 5 with near-perfect maintenance of enantiomeric excess. Tushar Kanti Chakraborty of the Central Drug Research Institute, Lucknow applied (Tetrahedron Lett. 2009, 50, 3306) the Ti(III) reduction of epoxides to the Sharpless-derived ether 6, leading to the pyrrolidine 7. Chun-Jiang Wang of Wuhan University devised (Chem. Commun. 2009, 2905) a silver catalyst that directed the absolute sense of the dipolar addition of 9 to 8 to give 10. Homoallyic azides such as 11 are readily prepared in high enantiomeric excess from the corresponding alcohol. Bernhard Breit of Albert-Ludwigs-Universität, Freiburg and André Mann of the Faculté de Pharmacie, Illkirch showed (Organic Lett. 2009, 11, 261) that Rh-mediated hydroformylation could be effected in the presence of the azide. Subsequent reduction delivered the piperidine 12. Jan-E. Bäckvall of Stockholm University applied (J. Org. Chem. 2009, 74, 1988) the protocol for dynamic kinetic asymmetric transformation (DYKAT) that he had developed to the cyanodiol 13. Remarkably, a single enantiomerically- pure diasteromer emerged, which he carried on to 14. Xiaodong Shi of West Virginia University found (Organic Lett. 2009, 11, 2333) that the stereogenic center of 17, even though it ended up outside the ring, directed the absolute configuration of the other centers of 18 as they formed. Jan Vesely of Charles University and Albert Moyano and Ramon Rios of the Universitat de Barcelona established (Tetrahedron Lett. 2009, 50, 1943) that an organocatayst directed the absolute configuration in the addition of 19 to 20 to give 21. Osamu Tamura of Showa Pharmaceutical University effected (Organic Lett. 2009, 11, 1179) cyclization of the malic acid-derived amide 22 to give 23 with high diastereocontrol.
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Büyüksaatçı Kiriş, Sinem, and Tuncay Özcan. "Metaheuristics Approaches to Solve the Employee Bus Routing Problem With Clustering-Based Bus Stop Selection." In Artificial Intelligence and Machine Learning Applications in Civil, Mechanical, and Industrial Engineering, 217–39. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-0301-0.ch012.

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Vehicle routing problem (VRP) is a complex problem in the Operations Research topic. School bus routing (SBR) is one of the application areas of VRP. It is also possible to examine the employee bus routing problem in the direction of SBR problem. This chapter presents a case study with data taken from a retail company for capacitated employee bus routing problem. A mathematical model was developed based on minimizing the total bus route distance. The number and location of bus stops were determined using k-means and fuzzy c-means clustering algorithms. LINGO optimization software was utilized to solve the mathematical model. Then, due to NP-Hard nature of the bus routing problem, simulated annealing (SA) and genetic algorithm (GA)-based approaches were proposed to solve the real-world problem. Finally, the performances of the proposed approaches were evaluated by comparing with classical heuristics such as saving algorithm and nearest neighbor algorithm. The numerical results showed that the proposed GA-based approach with k-means performed better than other approaches.
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Wang, Yixian, Rong Mu, Haohao Ren, Bingsen Jia, Xiao Gao, and Chufeng Sun. "A Photothermally Smart Hydrogel Material with Fast Response Properties." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220424.

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Hydrogel is a kind of functional polymer material. Because of its excellent characteristics such as high-water absorption, biocompatibility and stimulus response, hydrogel is widely used in biological tissue engineering, drug-controlled release, wastewater treatment, chemical mechanical devices, household products and other fields. The traditional hydrogels often have some disadvantages, such as slow response rate and fragile, which limit the application range of hydrogels. In this paper, we prepared a photo curable hydrogel photothermal response driving material. Because PNIPAAm hydrogel has excellent thermal driving response effect, it will shrink when the temperature is higher than 32 °C, and gold nanoparticles are good photothermal response materials. Therefore, the hydrogel actuator can realize fast response driving, and has excellent photothermal response efficiency and good environmental adaptability. The research scheme is to first prepare gold nanoparticle sol with appropriate concentration, and then synthesize PNIPAAm /AuNPs nano hydrogel. Its performance was characterized by SEM, TEM and UV spectroscopy, and its driving performance was studied.
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Kumar, Uttam, Nirmal Kumar, V. N. Mishra, and R. K. Jena. "Soil Quality Assessment Using Analytic Hierarchy Process (AHP)." In Interdisciplinary Approaches to Information Systems and Software Engineering, 1–18. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7784-3.ch001.

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Fields with rice-based cropping systems are unique from other wetland or upland soils because they are associated with frequent cycling between wetting and drying under anaerobic and aerobic conditions. This alters the C and N transformations, microbial activities and their diversity, and soil physical properties, depending on the other crop in rotation with rice. This chapter aims to compare the soil quality of vertisols of central plains of Chhattisgarh under rice-wheat and rice-chickpea cropping systems. Soil quality index was developed using analytical hierarchy process (AHP). Five soil quality indicators were selected under minimum datasets including soil organic carbon, mean weight diameter, available water content, available phosphorous and zinc. The results indicated that the rice-chickpea cropping system shows improved soil quality than that of rice-wheat cropping system.
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Silvestroni, Laura, and Diletta Sciti. "Effect of Transition Metal Silicides on Microstructure and Mechanical Properties of Ultra-High Temperature Ceramics." In MAX Phases and Ultra-High Temperature Ceramics for Extreme Environments, 125–79. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-4066-5.ch005.

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The IV and V group transition metals borides, carbides, and nitrides are widely known as ultra-high temperature ceramics (UHTCs), owing to their high melting point above 2500°C. These ceramics possess outstanding physical and engineering properties, such as high hardness and strength, low electrical resistivity and good chemical inertness which make them suitable structural materials for applications under high heat fluxes. Potential applications include aerospace manufacturing; for example sharp leading edge parts on hypersonic atmospheric re-entry vehicles, rocket nozzles, and scramjet components, where operating temperatures can exceed 3000°C. The extremely high melting point and the low self-diffusion coefficient make these ceramics very difficult to sinter to full density: temperatures above 2000°C and the application of pressure are necessary conditions. However these processing parameters lead to coarse microstructures, with mean grain size of the order of 20 µm and trapped porosity, all features which prevent the achievement of the full potential of the thermo-mechanical properties of UHTCs. Several activities have been performed in order to decrease the severity of the processing conditions of UHTCs introducing sintering additives, such as metals, nitrides, carbides or silicides. In general the addition of such secondary phases does decrease the sintering temperature, but some additives have some drawbacks, especially during use at high temperature, owing to their softening and the following loss of integrity of the material. In this chapter, composites based on borides and carbides of Zr, Hf and Ta were produced with addition of MoSi2 or TaSi2. These silicides were selected as sintering aids owing to their high melting point (>2100°C), their ductility above 1000°C and their capability to increase the oxidation resistance. The microstructure of fully dense hot pressed UHTCs containing 15 vol% of MoSi2 or TaSi2, was characterized by x-ray diffraction, scanning, and transmission electron microscopy. Based on microstructural features detected by TEM, thermodynamical calculations, and the available phase diagrams, a densification mechanism for these composites is proposed. The mechanical properties, namely hardness, fracture toughness, Young’s modulus and flexural strength at room and high temperature, were measured and compared to the properties of other ultra-high temperature ceramics produced with other sintering additives. Further, the microstructural findings were used to furnish possible explanations for the excellent high temperature performances of these composites.
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Conference papers on the topic "Other mechanical engineering, n.e.c"

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Dai, Shenlong L., Jean-Pierre Delplanque, and Enrique J. Lavernia. "Grain Growth Following Recrystallization in Reactive Spray Deposited Al-Mg-Mn Alloys." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0712.

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Abstract This paper focuses on the quantitative investigation of grain growth at 500, 530, and 560 °C in reactive spray deposited Al-Mg-Mn alloys after thermo-mechanical processing and recrystallization. Results show that reactive spray deposited 5083 alloy processed using N2-5%O2, in which no significant volume fraction of oxide particles was found, experienced significant grain growth when annealed at 500, 530 and 560°C following recrystallization. On the other hand, the reactive spray deposited 5083 alloy atomized with N2-10% O2 and the 5083+Zr alloy atomized with N2-5% O2 exhibit very slow grain growth below 530°C and limited grain growth at 560°C. This behavior is attributed to the retardation effect of the second phase particles that were formed in these alloys. The grain growth exponent of the two alloys are found to depend on the annealing temperature, with a value of n = 6 at 530°C and n = 5 at 560°C. The retardation effect of the oxide particle and the grain growth kinetics are analyzed in the context of the model developed by Anderson and Grong (Acta Met., 43:2678, 1995).
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Niemann, Michael U., Sesha S. Srinivasan, Ashok Kumar, Elias K. Stefanakos, D. Yogi Goswami, and Kimberly McGrath. "Processing Analysis of the Ternary LiNH2-MgH2-LiBH4 System for Hydrogen Storage." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11520.

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The ternary LiNH2-MgH2-LiBH4 hydrogen storage system has been extensively studied by adopting various processing reaction pathways. The stoichiometric ratio of LiNH2:MgH2:LiBH4 is kept constant with a 2:1:1 molar ratio. All samples are prepared using solid-state mechano-chemical synthesis with a constant rotational speed, but with varying milling duration. All samples are intimate mixtures of Li-B-N-H and MgH2, with varying particle sizes. It is found that the samples with MgH2 particle sizes of approximately 10nm exhibit lower initial hydrogen release at a temperature of 150°C. The as-synthesized hydrides exhibit two main hydrogen release temperatures, one around 160°C and the other around 300°C. The main hydrogen release temperature is reduced from 310°C to 270°C, while hydrogen is first reversibly released at temperatures as low as 150°C with a total hydrogen capacity of 6 wt.%.
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Yousuf, Louay S., and Dan B. Marghitu. "Effect of Eccentricity on the Nonlinear Dynamic Behavior of a Cam and Follower Mechanism With Clearance." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86202.

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This study evaluate the relationship between flat-faced follower’s offset and Lyapunov exponent. The nonlinear dynamic behavior has been investigated based Lyapunov exponent value. Two types of follower offset such as (e = 10, and 20 mm) has been examined from each side of the cam radial line. The simulation process has been done by using solidwork program. The power spectrum of Fast Fourier Transform and phase plane have been examined the follower non-periodicity during follower motion. The optimum follower offset that would minimize Lyapunov exponent is determined. The system with follower guide’s clearance C = 2 mm and e = 20 mm has larger Lyapunov exponent than the others at cam rotational speed N = 1200 rpm. The signal of follower motion is processed by using MATLAB program.
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Zhang, Xiaolong, Xiaolin Chen, and Hua Tan. "A Numerical Study on Highly Viscous Compound Cancer Cell Microfiltration." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66953.

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Cancer is a leading cause of death worldwide. There has been extensive research on cancer in recent decades, with many studies focusing on Circulating Tumor Cells (CTCs), i.e., cancer cells shed into the circulating bloodstream from a primary tumor site. CTCs are mainly responsible for initiating metastases, and can be used as an indicator for early cancer detection. Investigating CTCs and the related detection methods such as microfiltration is of great importance. CTCs as well as other cells are normally composed of highly viscous nucleus and cytoplasm which are encapsulated by the outermost layer of cortical membrane. In order to account for the effects of viscous nucleus and cytoplasm on the microfiltration process and study the dynamic characteristics comprehensively, a realistic model is preferred. In this research, we employ the compound droplet model consisting of three layers, the layer of cell membrane, cytoplasm and nucleus, to capture the full range of CTCs behavior during the microfiltration process. The compound cell deformation and pressure signature during microfiltration are studied numerically. Also discussed are the effects of nucleus-cytoplasm ratio (N/C ratio), their viscosity as well as surface tension on the cell behavior when it squeezing through the filter channel. Our results can gain insight into the physics behind the filtering process and provide some guidance to the design and optimization of such devices.
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Perl, M., C. Levy, and V. Rallabhandy. "The Influence of the Bauschinger Effect on the Combined Stress Intensity Factors for 3-D Internal Radial Cracks in a Fully or Partially Autofrettaged Gun Barrel." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81577.

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The influence of the Bauschinger Effect (BE) on KIN — the combined, Mode I, 3-D Stress Intensity Factor (SIF) distributions for arrays of radial, internal, surface cracks emanating from the bore of a fully or partially autofrettaged gun barrel is investigated. A thorough comparison between the combined SIFs for a “realistic” - Bauschinger Effect Dependent Autofrettage (BEDA) and those for an “ideal” - Bauschinger Effect Independent Autofrettage (BEIA) is performed. The 3-D analysis is performed via the finite element (FE) method and the submodeling technique, employing singular elements along the crack front. Both autofrettage residual stress fields, BEDA and BEIA, are simulated using an equivalent temperature field and more than 1200 different crack configurations are analyzed. SIFs for numerous crack arrays (n=1 to 64 cracks), a wide range of crack depth to wall thickness ratios (a/t=0.01 to 0.2), various ellipticities (a/c=0.5 to 1.5), several values of the yield-stress to pressure ratio (ψ=σyp/p=1.93 to 3.55) and different levels of autofrettage (ε=30% to 100%) are evaluated. The level of autofrettage efficiency for all BEDA cases is determined, and is thoroughly compared with that of BEIA. The largest combined SIF KNmax can be found at any angular location along the crack front and can reach its largest values for arrays of any number of cracks from 1 to 16, and therefore needs to be evaluated for each particular case. The Bauschinger Effect is found to have a dramatic detrimental impact on the fatigue life of the gun barrel. Even in the case were autofrettage has its minimal beneficial effect, (ψ=1.93), the BE can reduce the fatigue life of the barrel by a factor of 2 to 5. In other cases this factor can reach orders of magnitude, and in extreme cases, when autofrettage completely overcomes the pressure yielding a nil KNmax, this factor might become infinite, i.e., an infinite fatigue life for BEIA versus a finite fatigue life for BEDA. For a partially autofrettaged barrel, it is found that the lower the level of autofrettage, the smaller the Bauschinger Effect is. Increasing the level of autofrettage beyond ε=60% is found to be counterproductive, and therefore, it is not recommended.
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Hidayat, Reyhan, Pratika Siamsyah Kurniawati, Aries Taufiq Kurniawan, Irwan Setyaji, Gerardus Putra Pancawisna, Rantoe Marindha, Khalid Umar, et al. "Mechanical Isolation of a Challenging Reservoir: First Installation of High Expansion Straddle Packer in Indonesia." In Offshore Technology Conference Asia. OTC, 2022. http://dx.doi.org/10.4043/31475-ms.

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Abstract Well N-1 in Mahakam Sisi Nubi field, East Kalimantan, had a problem with water and condensate production up to 11,000 BLPD which instantly rendered the production facility overwhelmed despite the high 34 MMSCD gas rate. To solve this, reservoir production profiling using production logging tool was first carried out. Selection of existing zone isolation method was then compared, yet none satisfies the challenges in this well due to restriction and cost issues. A relatively new technology, High Expansion (HEX) Straddle Packer, was introduced as another alternative. A series of engineering design and followed by operation design was then carried out to solve the well problem safely. A dummy tool run with 2.875" OD and 30ft of length passed through the restriction safely. Caliper logging observes reduction in tubing ID from 3.9" to 3.0". Temperature of the borehole reached 115 deg C at 3417 mBRT of this well. The two water producing zones were next to each other with a total top reservoir to bottom reservoir length of 11 m. With these values, a custom 2.7" straddle packer was built and tested to required temperature and passed. Production simulation with 0.7" ID, indicated the well could still flow over its critical flow regime. After installation, the well flows with 11 MMSCFD of gas with ~1800 BLPD liquid produced, a 83% reduction over previous liquid flowrate. Despite the well flows only 30% from initial gas rate, this well can now flow at an acceptable liquid rate. The successful installation of the first HEX Straddle expands the portfolio of mechanical water shut off methods in Mahakam and in Indonesia as this was the first HEX Straddle installed in Indonesia. Further study and replications are needed, yet this method can be a viable alternative if other has failed for wells with similar problems.
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Lindberg Bjerke, Steinar, Jens P. Tronskar, Steven Chong, and Asle Venås. "Background and New Revision of DNVGL-RP-F108." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78652.

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DNV-RP-F108 [1] was first issued in 2006. The Recommended Practice was developed to provide guidance on testing and analyses for fracture control of pipeline girth welds subjected to cyclic plastic deformation, e.g. during installation by the reeling method, but also for other situations where pipelines may be subjected to large plastic strains. The Recommended Practice was based upon a Project Guideline developed within the Joint Industry Project “Fracture Control for Installation Methods Introducing Cyclic Plastic Strain - Development of Guidelines for Reeling of Pipelines”. The new revision is based on the extensive experience and knowledge gained over the years use of the previous versions, as well as new knowledge from recent R&D projects. The main content of Appendix A of DNV-OS-F101 (now DNVGL-ST-F101) [2] have been transferred to DNVGL-RP-F108. Only the requirements relative to ECA and testing have been retained in DNVGL-ST-F101 [2]. The new revision has got a new number and new title, i.e. DNVGL-RP-F108, “Assessment of Flaws in Pipeline and Riser Girth Welds”. This paper lists the fundamental changes made in the new RP from the old Appendix A of the previous DNV-OS-F101 and discusses some of the changes, although within this paper it is not possible to cover all changes. The focus is on clarification of use of S-N versus the fracture mechanics approach for fatigue life computation, classification of fatigue sensitive welds, calculations of more accurate crack driving force by re-introduction of the plate solution, for which a new Lr,max (plastic collapse) calculation and a modified way to account for residual stresses have been specified. The RP presents new assessment procedures pertaining to use of finite element analyses for fracture mechanics assessments. A unique feature of the new RP is the guidance on sour service testing and assessments included in the Appendix C of the document to support pipeline/riser ECAs to develop flaw acceptance criteria for NDT.
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O’Brien, Gary, Liwei Lin, and David J. Monk. "A Stiction Study via C-V Plot Electrostatic Actuation/Latching." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0280.

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Abstract We have demonstrated a stiction study methodology on the microscale via an electrostatically actuated polysilicon parallel plate capacitor. The actuator was used to cause physical contact between two polysilicon microstructures. C-V (capacitance-voltage) plots were used to extract mechanical parameters, including surface energy (J/m2), force of adhesion (N), and spring constant (N/m). An average surface energy of 8.9 mJ/m2 with corresponding standard deviation (σ) of 0.8 mJ/m2 was observed regarding polysilicon adhesion. The average force of adhesion was calculated to be 13.3 μN (σ = 1.2 μN) for a contact surface area of 1.256 × 10−9 m2. The calculated Z-axis spring constant was 15.9 N/m (σ = 1.6 N/m) as compared to the theoretical value of 16.8 N/m.
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Haji, A., B. Yunus, and H. Huxur. "Stability Analysis of an N-Unit Series Repairable System with a Repairman Doing Other Work." In 2015 International Conference on Electrical, Automation and Mechanical Engineering. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/eame-15.2015.176.

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Liu, Kui, Xianchao Hao, Ming Gao, Shuo Li, Yiyi Li, and Bofang Wang. "Effect of N Content on Mechanical Properties and Microstructure of Alloy 690." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75195.

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The microstructures and mechanical properties of nitrogen bearing Alloy 690 have been systematically investigated. Alloy ingots with different N addition, range from 38 to 330wt.ppm, were melted using vacuum induction melting (VIM) plus electro-slag re-melting (ESR) double processing techniques. The forged and hot rolled different N content bars were solid solution treated between 1010°C and 1080°C, thermally treated at 715°C for different state mechanical property testing and microstructure study. Microstructure analysis indicated that nitrogen addition to Alloy 690 can effectively refine the solution treated austenite grains. This may be associated with titanium nitrides pinning the grain boundaries and hindering the grain growth during solid solution treatment. More nitrides, which are identified as TiN, were found on the grain boundaries and in the inside of austenite grains with increasing N contents of the alloy. The carbide precipitation at 715°C showed significant difference identified by SEM. At the level of 38, 100 and 220wt.ppm N, the chromium carbide Cr23C6 distribution on the grain boundaries appeared to be semi-continuous; when the N content reached 330wt.ppm, only few discrete type of carbides were observed. The tension testing results at room temperature of different N content alloys proved that both the ultimate tensile strength (UTS) and the yield strength (YS) enhanced about 50MPa when N content was raised from 38 to 330wt.ppm in this alloy; while the corresponding elongation (EL) and reduction in area (RA) adversely dropped about 5%. Room temperature hardness rose with increasing N content, well matched tensile strength. High temperature tension testing results at the range of 900∼1250°C showed that a severely hot ductility dip, representing by the values of the reduction in area (RA), existed in 300wt.ppm and 100wt.ppm nitrogen containing alloys at the lower end temperature range of 950∼1100°C. However, such ductility dip could be improved when the N content was at 220wt.ppm, and completely eliminated at 38wt.ppm N content. At the higher end temperature rang of 1150∼1250°C, the ductility of all 4 nitrogen bearing alloys did not show significant difference, even though the hot ductility of minimum 38wt.ppm N samples was preferable. Nitrogen content did not affect high temperature strength; the UTS values nearly had no change at the same testing temperature with different nitrogen bearing alloys. The carbide precipitation difference of the thermally treated alloy, induced by N addition, may affect Alloy 690 corrosion properties, which needs to be studied in future. The mechanical properties variation both at room temperature and high temperatures of different nitrogen bearing alloys in this study will be certainly beneficial to determine the practical processing routes of Alloy 690.
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Reports on the topic "Other mechanical engineering, n.e.c"

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FATIGUE BEHAVIOUR OF TITANIUM-CLAD BIMETALLIC STEEL PLATE WITH DIFFERENT INTERFACIAL CONDITIONS. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.273.

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Titanium-clad (TC) bimetallic steel is a type of high-performance steel, with high corrosion resistance attributed to the titanium alloy and economy as well as excellent mechanical properties resulted from structural steel. Such advanced bimetallic steel is suitable for marine structures, bridges, and buildings exposed to the highly corrosive environment. This paper aims to clarify the high cycle fatigue properties of the hot-rolled TC bimetallic steel with two interface shear strengths of 40MPa and 140MPa. Their stress-strain curves were obtained by the tensile coupon tests. The fatigue S-N curves of TC bimetallic steel at a stress ratio of 0.1 are introduced, which show excellent fatigue performance compared with structural steel. In addition, the hot-rolled TC bimetallic steel with 140 MPa interface shear strength has 21% improvement in fatigue performance than the other one. Despite this, the influence of the interfacial conditions on the high cycle fatigue performance is generally limited. Finally, the S-N curves suitable for these two kinds of TC bimetallic steel are suggested. The research outcomes can provide a reference for understanding the fatigue behaviour of the TC bimetallic steel and the selection of different interfacial conditions in structural engineering
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