Journal articles: 'Aging properties'

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Jin, Shuai, and Xiao Lu Gong. "Effect of Ultraviolet and Moisture Aging on the Mechanical Properties of Hemp Fibers Composites." Applied Mechanics and Materials 226-228 (November 2012): 1739–42. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.1739.

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Polypropylene reinforced by hemp fibers composites were prepared by injection method. An aging chamber was used to simulate and accelerate the natural ageing process. The influence of moisture and UV aging on the mechanical properties of the composites is studied in this paper. A modified law of mixtures applying to polypropylene/hemp fibers composites is proposed. The microstructures of the composites during aging treatment were analyzed by means of digital microscope. We can see that the moisture and UV aging reduced the mechanical properties of the composites. The UV aging is more penalizing on the mechanical properties of composites, compared to the moisture aging after 4 weeks of exposure.

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Ma, Li Xing. "Effect of Ageing on Rheological Properties of Asphalt." Key Engineering Materials 891 (July 6, 2021): 185–89. http://dx.doi.org/10.4028/www.scientific.net/kem.891.185.

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This paper is to study the mechanism of aging on the rheological properties of the asphalt and make correlations with the actual field behavior of the binder. The effects of ageing on rheological properties of asphalt has been studied by Dynamic Shear Rheometer(DSR). Significant differences of rheological properties and composition were observed between fresh and aged asphalt. The results show that aging at low temperature increases the complex modulus of asphalt, but has little effect at high temperature.

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AlAssaad, Mahmoud, and Mohamad Yehea Al nefawy. "The Effect of pre-aging treatments on Tensile Properties and Hardness for Aluminum Alloys." Association of Arab Universities Journal of Engineering Sciences 26, no. 4 (December 31, 2019): 98–104. http://dx.doi.org/10.33261/jaaru.2019.26.4.012.

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Abstract— In this research the effect of artificial aging on tensile strength and hardness for Al-Mg-Si (6061 Aluminum alloy) was study, samples from 6061 alloy were submitted to one step artificial aging for different temperatures, while others samples were submitted to two steps artificial aging (where there is a first stage as pre-aging) in descending and ascending modes. The results showed that the highest tensile strength values were reached 214.7 [N/mm2] and hardness were reached 220 [HB] for 6061 Aluminum alloy when the samples were treated by one-step ageing in 190 [°C] for 3 [hour]. While tensile strength and hardness values of samples treated by two-step ageing were slightly higher than these values when the samples was aged at one stage. Where the maximum values of tensile strength was 215 [N/mm2] and for hardness was 227 [HB] when the 6061 alloy treated with two-step ageing the first one in 175 [°C] for 2 [hour] and the second one in 205 [°C] for 1 [hour].

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Wang, Gui Qing, Zhong Kui Zhao, and Yan Liu. "Analyzing the Microstructure and Tensile Properties of an Al8Si0.35Mg Cast Alloy with Prolonged Aging." Key Engineering Materials 353-358 (September 2007): 353–56. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.353.

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This paper examined the microstructure and tensile properties of an Al8Si0.35Mg cast alloy during several prolonged aging treatments. The results show that there is a improvement in ductility for solution treated Al8Si0.35Mg samples aging at 150 °C more than about 20 h to 48 h or ageing at 200 °C more than about 10 h to 20 h, but no significant reductions in UTS are observed. There is a substantial improvement in ductility at long aging times at the cost of UTS decreases. The morphology changes and distribution characteristics of precipitates and its effect on tensile properties in prolonged aging conditions have been analyzed.

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Nanda, Asok K., Subarna Bhattacharjee, and S. S. Alam. "Properties of aging intensity function." Statistics & Probability Letters 77, no. 4 (February 2007): 365–73. http://dx.doi.org/10.1016/j.spl.2006.08.002.

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Wang, Ya Zhen, Yong Li, Wei Nan Jia, Cheng E. Yue, and Di Ma. "Study on Anti-Aging Performance of Composite Materials of PP-G-an /PP /SiO₂." Advanced Materials Research 634-638 (January 2013): 2023–27. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.2023.

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In order to further improve the anti-aging properties of polypropylene (PP), the polypropylene (PP) was modified via Supercritical carbon dioxide (SC CO2) grafting copolymerization with AN. PP-g-AN characterized by FT-IR. Polypropylene grafted acrylonitrile (PP-g-AN) / polypropylene (PP) / silica (SiO2) were blended. The influence of the contents of PP-g-AN on the anti-aging property was discussed. At the same time, the anti-aging mechanism was studied. After the artificial accelerated ageing test, the result shows that the anti-aging properties of PP were improved greatly which due to the addition of PP-g-AN and SiO2．

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ISHIJIMA, Yasuhiro, and Fumiyoshi UENO. "ICONE23-2026 THERMAL AGING EFFECT FOR CREEP PROPERTIES ON NI BASE REFRACTORY ALLOYS." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2015.23 (2015): _ICONE23–2—_ICONE23–2. http://dx.doi.org/10.1299/jsmeicone.2015.23._icone23-2_12.

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Abe, Hiroshi, Keita Shimizu, and Yutaka Watanabe. "ICONE15-10599 Low-temperature aging of delta-ferrite in 316L SS welds; changes in mechanical properties and etching properties." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2007.15 (2007): _ICONE1510. http://dx.doi.org/10.1299/jsmeicone.2007.15._icone1510_325.

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Salopek Čubrić, Ivana, Goran Čubrić, and Vesna Marija Potočić Matković. "Behavior of Polymer Materials Exposed to Aging in the Swimming Pool: Focus on Properties That Assure Comfort and Durability." Polymers 13, no. 15 (July 22, 2021): 2414. http://dx.doi.org/10.3390/polym13152414.

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The degradation of polyamide (PA) and polyester (PES) polymers is under intense study due to growing concerns about the accumulation of plastics in soils and oceans. Previous studies confirm that ageing degrades PA and PES at the molecular level. However, researchers have not addressed the development of protocols for aging textile materials in swimming pools, and few data are available on the effects of aging on comfort and durability. This research addresses the development of the aging protocol for PA and PES swimwear materials, its implementation, and the evaluation of properties that assure comfort and durability after specific periods of exposure. The tests include microscopic analysis, tensile tests, determination of fluid transport phases and drying period. The results revealed changes in the surface of the material in terms of fibrillation (more pronounced after outdoor aging). There is a positive correlation between the exposure duration and the breaking force (R2 ranges from 0.85 to 0.98), with a stronger correlation for the PA materials. The decrease in breaking force due to aging is up to 40%, indicating significantly reduced durability. The change in breaking force follows the changes in mass (R2 = 0.867). In terms of comfort assurance, outdoor aging of materials should have a greater negative impact than indoor ageing.

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Hassan, Rushdya Rabee Ali, Salwa Moustafa Amer Mahmoud, Marina Atef Nessem, Reham Tarek Abdel Aty, Mariam George Ramzy, Eldessoky S. Dessoky, Ahmed Abdelkhalek, and Mohamed Z. M. Salem. "Hydroxypropyl cellulose loaded with ZnO nanoparticles for enhancing the mechanical properties of papyrus (Cyperus papyrus L.) strips." BioResources 16, no. 2 (February 18, 2021): 2607–25. http://dx.doi.org/10.15376/biores.16.2.2607-2625.

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Unfortunately, papyrus has not been sufficiently studied regarding improvement of the mechanical or optical properties, which degrade under the impact of aging factors over time. The aims of this research were studying the effects of hydroxypropylcellulose (HPC) loaded with 0.25% of ZnO nanoparticles (NP) at different concentrations (1% and 2%) on papyrus sheet properties before and after aging. Various analyses were used, such as visual assessment by a universal serial bus (USB) digital microscope, mechanical properties, Fourier-transform infrared (FTIR) analysis, color change, and pH measurement. A dramatic increase in mechanical properties was observed after treatment. Besides, FTIR illustrated increasing of CH2 and OH stretching, which contribute to increasing the cellulose crystallinity index. There was no significant change in pH values after treatment or ageing. Slight changes of optical characteristics were observed for treated samples, after the artificial aging of the treated samples, the mechanical measurements showed that the values of tensile strength and elongation were close to the values of the standard sample, which may contribute to preventive protection of ZnO NP for treated samples from the artificial ageing.

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Cocca, M., L. D'Arienzo, and L. D'Orazio. "Effects of Different Artificial Agings on Structure and Properties of Whatman Paper Samples." ISRN Materials Science 2011 (July 13, 2011): 1–7. http://dx.doi.org/10.5402/2011/863083.

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With the aim at controlling cellulose degradation phenomena, the natural aging of Whatman paper samples was simulated through different artificial aging processes: thermal oxidation in air at constant temperature, photo-oxidation under Xenon arc lamp, accelerating ageing in climatic chamber, and chemical oxidation with sodium methaperiodate. The cellulose degradation was studied by means of viscosimetric, Fourier transform infrared spectroscopy (FTIR), and wide angle X-ray scattering (WAXS) techniques together with thermogravimetric (TGA), mechanical, and optical analyses. All the treatments carried out were found to significantly modify paper structure and properties, the extent of the deterioration effects depending upon the aging kind. Direct correlations were, nevertheless, assessed among level of cellulose molecular degradation, formation of carboxyl, and/or carbonyl groups and paper strain at break.

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Jia, Liang, and Yan Peng Zhu. "Study on the Reclaimed Binder Properties Using Vacuum Rotating Reclaim." Advanced Materials Research 168-170 (December 2010): 2575–79. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.2575.

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In the past few years, recycled asphalt has been used successfully in asphalt concrete pavement in China. However, the performance of recycled asphalt does not know. The objective this study is analyses the performance of asphalt which using vacuum rotating reclaim. Lanlian No.70 petroleum asphalt was put into pressure aging vessel after one hour, five hours, ten hours, fifteen hours, and twenty hours of aging. Afterwards, the different aging degree asphalt was dissolved by trichloroethylene, and then asphalt reclaimed which using vacuum rotating reclaim method. In the end, performances indexes of recycled asphalt were tested, such as penetration, softening point, ductility, viscosity, dynamic shear modulus, phase angle, bending creep stiffness. Performances indexes of Lanlian No.70 original petroleum asphalt were also tested. The performances indexes were compared of different aging degrees recycled asphalt and origin asphalt. Comparison results indicate that some performance indexes of recycled asphalt are decease; these indexes consist of penetration, ductility and phase angle. The other performances indexes are rise; those indexes include softening point, dynamic shear modulus, bending creep stiffness and viscosity. However, variation of performances indexes is minimal. Therefore, vacuum rotating reclaim method will not make asphalt ageing for considering equipment and human factors. We can use vacuum rotating reclaim method to reclaim discard asphalt concrete.

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13

Refaey, Abdullah A., M. A. Abdel-Rahman, and Emad A. Badawi. "Artificial Ageing Effect on Mechanical, Electrical Properties and Positron Lifetime of Aircraft 2024 Alloy." Defect and Diffusion Forum 329 (July 2012): 63–68. http://dx.doi.org/10.4028/www.scientific.net/ddf.329.63.

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Heat Treatments for Different Aging Times Were Performed on 2024 Aluminum Alloy. the Effect on the Positron Lifetime, Electrical and Mechanical Properties of the 2024 (Al-Cu-Mg) Alloy Was Studied. Artificial Ageing Was Conducted by Heating at a Constant Rate to a Specific Temperature, Followed by Annealing. the Alloy Was Treated at 192°C for Various Times, Followed by Annealing. Measurements as a Function of Aging Time Were Found to Exhibit Prominent Changes Related to the Formation of Precipitates.

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Sivamaruthi, Bhagavathi Sundaram, Periyanaina Kesika, and Chaiyavat Chaiyasut. "A REVIEW ON ANTI-AGING PROPERTIES OF PROBIOTICS." International Journal of Applied Pharmaceutics 10, no. 5 (September 8, 2018): 23. http://dx.doi.org/10.22159/ijap.2018v10i5.28249.

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Aging is the inevitable biological event associated with several physiological, behavioral, and lifestyle events, but people do not wish to become old. The market for anti-aging products is growing gradually, and customers are aware of active principles in the cosmetics. The probiotics are known for several health benefits; especially probiotics regulate the gut health and immune system. Recent studies emphasized the role of probiotics, and probiotic-containing fermented products in cosmetics, and aging. The whole mechanism of aging has not been elucidated yet, but modern aging theories are in two different categories such as programmed theory and damage theory. The aging mechanisms can be discussed in organismal, and cellular level. To some extent, organismal and premature aging is controlled by genetic makeup. Though genetic, and environmental factors impact healthy aging, diet and gut microbiota also play a significant role in senescence. Aging is greatly associated with a diversity of gut microbiota that is often related to the changes in the gastrointestinal tract, and dietary patterns, together with an associated decline in cognitive and immune function, eventually contributing to infirmity. Lactic acid bacteria are reported for the ability to extend the lifespan and/or healthspan. The current manuscript discussed the aging mechanisms, an association of microbiome and aging, and compiled the reported anti-aging properties of probiotics.

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Yakubovskiy, Yuriy E., Vasiliy I. Kolosov, Irina A. Donkova, and Sergey O. Kruglov. "Modeling Viscoelastic Properties of Aging Material." Tyumen State University Herald. Physical and Mathematical Modeling. Oil, Gas, Energy 4, no. 4 (December 17, 2018): 181–90. http://dx.doi.org/10.21684/2411-7978-2018-4-4-181-190.

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Burkschat, M., and J. Navarro. "AGING PROPERTIES OF SEQUENTIAL ORDER STATISTICS." Probability in the Engineering and Informational Sciences 25, no. 4 (July 21, 2011): 449–67. http://dx.doi.org/10.1017/s026996481100012x.

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Sequential order statistics describe the ordered failure times in a k-out-of-n system, where the failures of components might affect the performance of remaining working components. In this article aging properties of sequential order statistics are examined and conditions are given such that the distribution of a sequential order statistic is ILR, IFR, IFRA, or NBU. Moreover, conditions for aging properties of spacings of sequential order statistics are obtained.

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Frontera, Walter R., Virginia A. Hughes, Lisa S. Krivickas, and Ronenn Roubenoff. "Contractile Properties of Aging Skeletal Muscle." International Journal of Sport Nutrition and Exercise Metabolism 11, s1 (December 2001): S16—S20. http://dx.doi.org/10.1123/ijsnem.11.s1.s16.

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18

Purnomo, E. H., D. van den Ende, J. Mellema, and F. Mugele. "Linear viscoelastic properties of aging suspensions." Europhysics Letters (EPL) 76, no. 1 (October 2006): 74–80. http://dx.doi.org/10.1209/epl/i2006-10234-2.

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Graper, Robert G. "Aging Skin Properties and Functional Changes." Plastic and Reconstructive Surgery 97, no. 6 (May 1996): 1299. http://dx.doi.org/10.1097/00006534-199605000-00030.

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Franz, Silvio, Marc Mézard, Giorgio Parisi, and Luca Peliti. "Measuring Equilibrium Properties in Aging Systems." Physical Review Letters 81, no. 9 (August 31, 1998): 1758–61. http://dx.doi.org/10.1103/physrevlett.81.1758.

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Hidaka, Yuki, Shinya Tsukada, and Seiji Kojima. "Aging of Dielectric Properties in Na0.5Bi0.5TiO3Ceramics." Ferroelectrics 376, no. 1 (December 2008): 134–39. http://dx.doi.org/10.1080/00150190802440963.

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Redjala, S., N. Aït Hocine, R. Ferhoum, M. Gratton, N. Poirot, and S. Azem. "UV Aging Effects on Polycarbonate Properties." Journal of Failure Analysis and Prevention 20, no. 6 (September 16, 2020): 1907–16. http://dx.doi.org/10.1007/s11668-020-01002-9.

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Dolatowski, Z. J., and J. Stadnik. "Effect of sonication on technological properties of beef." Biosystems Diversity 15, no. 1 (June 6, 2007): 220–23. http://dx.doi.org/10.15421/010739.

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Ultrasound treatment during rigor mortis period led to an acceleration of aging processes. No significant influence of sonication on acidity during ageing was observed. Ultrasound treatment did not influence the lightness, but according to the shear force measurements, improve meat tenderness. Differentiated technological properties of examined samples may result from influence of ultrasound on protein structures of meat. As a result of ultrasound treatment an increase of free calcium ions concentration occurred. Obtained results pointed out that sonication may be an effective method of formation of technological properties of beef during ageing.

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Han, Nian Feng, De Jie Zhou, and Xin De Tang. "Preparation and Properties of OMMT/ SBS Modified Bitumen." Advanced Materials Research 168-170 (December 2010): 852–55. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.852.

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Organophilic montmorillonite (OMMT)/SBS modified bitumen composites were prepared by melt intercalation. The physical properties and ageing properties of OMMT/SBS modified bitumen were investigated. The results showed that OMMT/SBS modified bitumen exhibited a decreasing penetration, an increasing softening point, and a decreasing ductility. Compared with that of SBS modified bitumen, the OMMT /SBS modified bitumen can enhance the aging resistance of SBS modified bitumen.

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Lekdim, Atef, Laurent Morel, and Marie-Ange Raulet. "Magnetic properties evolution of a high permeability nanocrystalline FeCuNbSiB during thermal ageing." European Physical Journal Applied Physics 79, no. 2 (July 10, 2017): 20601. http://dx.doi.org/10.1051/epjap/2017160449.

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It is found to be one of the major issues while designing an aircraft, mass and volume have to be reduced in order to achieve energy efficiency. This leads to a high compactness of the electrical components which enables them to withstand at high temperatures. The magnetic components which are responsible for the electrical energy conversion, therefore exposed to high temperatures in working conditions. Their thermal ageing becomes a serious problem and deserves a particular attention. The FeCuNbSiB nanocrystalline materials have been selected for this ageing study because they are used in power electronic systems very frequently. The objective of the study is based on monitoring the magnetic characteristics under the condition of several continuous thermal ageing (100, 150, 200 and 240 °C). An important, experimental work of magnetic characterization is being done through a specific monitoring protocol and X-ray diffraction (XRD) along with magnetostriction measurements was carried out to support the study of the evolution of the anisotropy energies with aging. The latter is discussed in this paper to explain and give the hypothesis about the aging phenomena.

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Wu, Yu Jiao, and Chun Ping Yang. "The Outdoor Aging Properties of Polypropylene/Mica Composite." Applied Mechanics and Materials 670-671 (October 2014): 177–81. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.177.

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In this paper, In this paper, polypropylene / mica composites were prepared by blending, using polypropylene (PP) as matrix, mica as filler. In order to study the anti-aging properties of polypropylene / mica composite materials, the above polypropylene / mica composite materials were placed outside to study the influence of natural aging time on the anti-aging properties and to explore the natural aging mechanism of polypropylene / mica composites. Natural aging research results show that:with the extension of the natural aging time the surface of materials will appear cracks and sheddings. The trends of tensile strength reduce at first, then increase and then decrease; the notched impact toughness values show fluctuating in the early aging, then an increase following and then decreasing.The increase of mica content are good for maintaining the mechanical properties of PP / mica composite, PP-g-MAH helps to maintain the tensile strength, while toughening POE-g-MAH will weaken the anti-aging properties of polypropylene / mica composite materials.

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da Costa, JA, A. Akhavan-Safar, EAS Marques, RJC Carbas, and LFM da Silva. "Effects of cyclic ageing on the tensile properties and diffusion coefficients of an epoxy-based adhesive." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 235, no. 6 (February 15, 2021): 1451–60. http://dx.doi.org/10.1177/1464420721994871.

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In real practice, adhesively bonded structures are usually exposed to cyclic environmental conditions. However, cyclic ageing processes are relatively unexplored. The aim of this study is to consider the effect of cyclic ageing on the rate of water uptake and the drying process in an epoxy-based adhesive. Fick’s law was considered to estimate the water diffusion coefficients for the ageing and the drying steps at different cycles. Different cyclic ageing times have been considered in the ageing procedure. Dogbone shape specimens were also manufactured and subjected to cyclic aging to investigate the tensile properties of the tested adhesive as a function of aging cycles. The gravimetric results showed that the rate of water uptake and drying is mainly a function of the level of water uptake of the first ageing cycle. Tensile test results showed that the maximum water content increases with each subsequent ageing cycle. It was also found that the Young’s modulus and the tensile strength of the adhesive decreased significantly after the initial ageing cycle, but all subsequent ageing cycles have considerably less influence on the mechanical properties of the adhesive.

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Zhang, Wen Gang, Liang Zhou, and Ling Zou. "Laboratory Research on Aging Properties of Recycled SBS Modified Asphalt." Applied Mechanics and Materials 477-478 (December 2013): 964–67. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.964.

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To study the aging degree, aging rate of recycled SBS modified asphalt at different aging time and the difference between the recycled one and the new one, aging nonlinear differential equations of recycled SBS modified asphalt and new SBS modified asphalt are established, aging parameters have been calculated by determining the technical indexes of the recycled SBS modified asphalt and the new one. In addition, aging properties of recycled SBS modified asphalt have been analyzed according to the aging parameters and aging equation. The results show that: the nolinear equation can depict the aging properties of both the recycled SBS modified asphalt and the new one; moreover, during the early period of aging, Various performance of recycled SBS modified asphalt decay more rapidly than new one except ductility, while after aging for a long time, various performance tends to be the same.

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Liao, Hai Long, Li Hua Zhan, Yuan Gao, Xue Ying Chen, and Ming Hui Huang. "Investigation on the Stress Relaxation Aging Behavior of 2195 Al-Li Alloy." Solid State Phenomena 315 (March 2021): 37–42. http://dx.doi.org/10.4028/www.scientific.net/ssp.315.37.

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2195 Al-Li alloy is famous for high strength, excellent fatigue strength and good stress corrosion resistance, which is widely used in the manufacture of high-performance aerospace components. The aim of this study is to validate how the stress relaxation aging behavior effect on the mechanical properties of 2195 Al-Li alloy. Through mechanical property test, the research was found that the performance after stress relaxation aging is higher than artificial aging (AA). In addition, the analysis of scanning electron microscopy SEM and TEM revealed that dislocations should be introduced by the stress relaxation aging process, which is more conducive to the precipitation of the T1 phase and strengthened the material with prolong ageing time. The results show that stress relaxation aging can significantly promote the precipitation of the T1. Therefore, this paper sheds new light on how SRA can improve mechanical properties and that SRA make better improve the distribution of precipitates in the grain boundary.

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Huan, Chang Tian, Jin Feng Xia, Dan Yu Jiang, and Qiang Li. "Aging Properties of Yttria-Stabilized Zirconia Ceramics." Key Engineering Materials 512-515 (June 2012): 435–38. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.435.

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This paper compares the low-temperature aging performance of 5Y-TZP and 8Y-TZP by coprecipitation and solid-phase synthesis methods in the steam. Analysis the weight changes of samples using analytical balance, and the sample surface microstructure and phase changes with SEM, XRD. The results show that the content of Y2O3 and synthesis method all affect the aging properties of zirconia ceramics; solid-phase synthesis of 8Y-TZP has the best anti-aging performance.

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Quan, Li Wei, Rui Wu, Da Ran Fang, Yuan Yuan Liu, and Chuan Cai Wang. "Effect of Pre-Treatment on the Precipitation Hardening of a Novel Al-Mg-Si Alloy." Advanced Materials Research 881-883 (January 2014): 1374–77. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.1374.

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Al-Mg-Si alloy is used to investigate the bake-hardening response as automotive body panels. Natural aging followed by artificial aging at 170°C was carried on to study the effect of delaying at room temperature. Two methods are carried on to investigate the effect of pre-treatment on hardening response of Al-Mg-Si alloy. One is pre-aging in the range 80-140°Cfollowed by artificial aging at 170°C after natural aging for the same periods, and the other is retrogression treatment followed by artificial aging at 170°C after natural aging for the same periods. The properties of the alloy are tested by Vickers hardness measurements. And it is found that the optimal pre-ageing is 170°C for 30min and the opimal retrogression treatment is 230°C for 15s.

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Qin, Yong Xiong, Jia Fu, Lan Yu, Zi Rong Yang, and Wen Yi Guo. "Comparative Research on Aging Properties of HTV Silicone Rubber via Outdoor Electric Aging and Ultraviolet Accelerated Aging." Advanced Materials Research 641-642 (January 2013): 333–37. http://dx.doi.org/10.4028/www.scientific.net/amr.641-642.333.

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In order to further study the aging properties of high temperature vulcanization (HTV) silicone rubber for composite insulator in the high-altitude region, tests of outdoor electric aging and ultraviolet accelerated aging have been carried out in the paper. The contact angles test, scanning electron microscopy (SEM) and fourier transform infrared spectroscopy (FTIR) were used to study the microscopic physical properties of samples after the aging tests. SEM observed that the surface flatness of samples declined, holes and particles increased on the sample surface, a large number of fillers exposed. The results of FTIR showed that Si-C bonds in the side chain in Si-O backbones were broken by ultraviolet radiation and methyl groups were oxidized, a small amount of fire retardant (Al2O3•3H2O) were decomposed, hydrophilic groups increased, all which have happened on the HTV silicone rubber after both the aging tests under the same ultraviolet radiation. The differences between the aging properties of two kinds of tests are that the aging extent of samples after outdoor electric aging was severer than that in ultraviolet accelerated aging, and the surface hydrophobicity of it after outdoor electric aging increased compared to ultraviolet accelerated aging. The aging of HTV silicone rubber for composite insulator is mainly caused by strong ultraviolet radiation in high-altitude region.

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Zhou, Zhong Bo, Jin Shan Li, Hong Chao Kou, Zhi Shou Zhu, Bin Tang, and Hui Chang. "Aging Response of TB-13 Titanium Alloy." Materials Science Forum 654-656 (June 2010): 859–62. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.859.

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In order to develop a perspective of the new metastable β titanium alloy——TB-13, the influence of ageing treatments on the microstructure and properties has been studied. The results show that TB-13 alloy displays high age strengthening effect and fine precipitation. During the one-step aging process, the higher the aging temperature, the coarser the α plate thickness. As a result, TB-13 alloy shows the lower the strength and the higher the ductility. The best combination of strength and ductility is acquired in the TB-13 alloy after solution treatment at 1133K following aging at 813K for 16h. The ultimate strength is near 1400MPa and the specific elongation is 7.0% by ageing. At last, the details of the transformation mechanism and microstructural evolution accompanying ω-assisted α nucleation during continuous heating are discussed.

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Tu, Leping, Yan Chen, and Lifeng Wu. "Grey Forecast Model with Aging Fractional Accumulation and Its Properties." Journal of Mathematics 2021 (July 19, 2021): 1–12. http://dx.doi.org/10.1155/2021/7596694.

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A novel aging fractional accumulation operator is proposed. The aging accumulation operator can dynamically update the accumulation weight of data and flexibly change the forecast trend by adjusting the aging parameter. In addition, a new aging accumulated grey model is obtained by using the aging accumulation operator to improve the traditional grey model. In the analysis of four examples, the existing grey accumulation operator and prediction method are compared. The results show that the proposed aging accumulation operator and aging accumulation grey model have excellent performance.

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Xu, Xing Xin, Chang Jun Sun, Xing Chen, Liang Qin, and Jian Ying Yu. "Investigation on the Aging Properties of Silicone Coating in Marine Concrete." Advanced Materials Research 366 (October 2011): 296–300. http://dx.doi.org/10.4028/www.scientific.net/amr.366.296.

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This paper reports result of a study conducted to evaluate the aging properties of isobutyl triethoxysilane coating used in marine concrete. The silicone coating was brushed to the surface of mortar specimens and the aging properties of the silicone coating were investigated by thermal aging and ultraviolet (UV) aging. The water absorption of the mortar specimens applied with the silicone coating increases with the extension of the aging time. And the higher aging temperature, the bigger the water absorption. Because of the combined effect of light and heat, water absorption of specimens after UV aging at 60 °C is larger than that after thermal aging in the same temperature. In addition, noticeable variation in aging properties of the same silicone coating by different manufacturers is noted.

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Li, Chen, and Sheng Ling Xiao. "Effects on the Properties of Polyethylene Film Aging by Different Methods." Advanced Materials Research 830 (October 2013): 49–52. http://dx.doi.org/10.4028/www.scientific.net/amr.830.49.

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Aging of plastics occurs in use, it makes the performance degrade, and losing use value finally. In order to compare ultraviolet aging with thermal aging, we carry out a pilot study on the performance changes of PE film. The results demonstrated that the tensile property became lower under two aging methods, the tensile property during the thermal aging decreased by 6.07% but it was 15.08% in the ultraviolet aging at 120h, obviously the effects of the ultraviolet aging on the tensile strength were more significant, it declined faster. The air permeability curves were on the rise under the two aging methods, the results demonstrated that the effect of the ultraviolet aging on the air permeability rose slightly more than the thermal aging. The moisture permeability curves decreased firstly and then increased, but the values of the ultraviolet aging were higher.

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Yu, Bao Yi, Tian Jiao Gao, Qi Li, Yu Juan Wu, and Run Xia Li. "Microstructure and Mechanical Properties of Extruded AZ31 Profile with High Performance." Materials Science Forum 747-748 (February 2013): 457–62. http://dx.doi.org/10.4028/www.scientific.net/msf.747-748.457.

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Based on the advantages of Mg alloys, AZ31 alloy profiles were designed for mobile phones cell, and cars, which expanded Mg alloy application and achieved the purpose of environmental protection and energy saving. Tensile strength of the profile reached to 256 MPa, and elongation was 17.9%. The effects of different heat treatment parameters on microstructure and plastic property of AZ31 alloys profiles were studied. After aging heat treatment (T5), the comprehensive mechanical properties at room temperature of the profiles increased. The tensile strength reached to the maximum of 261 MPa, and the elongation reached to 14.3%, after ageing at 225 for 20h. The elongation reached the maximum value of 18.3%, however, the tensile strength decrease to 241 MPa, after aging at 175 for 15h. Moreover, the influence of cryogenic treatment on microstructure and plastic property of the AZ31alloy profiles were studied. The results showed that elongation increased with the increase of treatment time, which would reach to 18.5% after cryogenic treatment. In addition, by cryogenic treatment and aging treatment, the tensile strength improved to 271 MPa. The cryogenic treatment improved obviously the plastic ability of AZ Mg alloys, while normal heat treatment improved it unobviously.

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Hu, Su Min, Chao Hui Wang, Qun Le Du, and Rui Li. "Research on Aging Properties of Tourmaline Modified Asphalt." Advanced Materials Research 535-537 (June 2012): 1715–18. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.1715.

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Aging properties of tourmaline modified asphalt prepared by melt blending were studied. The change laws of aging properties of asphalt caused by different types and contents of tourmaline were studied systematically by rotated thin film oven tests (RTFOT), in which the indices of aged residues such as softening point, penetration and ductility were tested. The results showed that the anti-aging performance of asphalt was improved effectually with addition of tourmaline, the ratio of residual penetration and ductility increased, and the softening point increment of aged asphalt decreased. The improvement of anti-aging performance of asphalt reduced with the increasing mixing amount of tourmaline. Tourmaline anion powder (5000ions) was recommended to improve the anti-aging performance of asphalt.

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Mu, Si Guo, Jiao Yan Dai, Yong Ru Wang, Guo Hui Chao, Xi Ping Hong, and Yu Chang Su. "Study on Microstructure and Properties of CuZn37Mn3Al2FeSi Alloy." Advanced Materials Research 287-290 (July 2011): 868–74. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.868.

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The microstructure of Cu-37%Zn-2%Mn-1.6%Al-0.7%Fe-0.7%Si (mass fraction)alloy was studied by scan electron microscopy, X-ray and optical microscopy. The α phase ratio and micro-hardness of this alloy after aging treatment were investigated. The results show that three kinds of phases, such as α phase, β phase and hexagonal club-shape Mn5Si3 phase were observed. The needle α phase ratio increases with aging temperature under 420°C and reach peak value 25 percent after aging at 420°C×1h. The α phase ratio begin decreases when the aging temperature over 420°C. The micro-hardness varying with aging temperature is the opposite.

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Fakir, Muhamad Saipul, Azzuliani Supangat, and Khaulah Sulaiman. "Properties of Y-Shaped PFO-DBT Nanotubes." Journal of Nanomaterials 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/672798.

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Immersion of template into solution is used to synthesize the Y-shaped poly[2,7-(9,9-dioctylfluorene)-alt-4,7-bis(thiophen-2-yl)benzo-2,1,3-thiadiazole] (PFO-DBT) nanotubes. Solution annealing and different aging times (1, 24, and 72 hours) are conducted to synthesize the Y-shaped PFO-DBT nanotubes and the effects on the morphological, structural, and optical properties of Y-shaped PFO-DBT nanotubes are investigated. The dense, aligned, and elongated Y-shaped PFO-DBT nanotubes have been successfully fabricated by aging the PFO-DBT solution for 72 hours. Enhanced light absorption with less light scattering can be exhibited from the elongated Y-shaped PFO-DBT nanotubes. Partial and complete infiltration is governed by 1 hour and 72 hours of aging time, respectively. Preformed nanofibres are initiated by the process of annealing and aging of PFO-DBT solution. During the aging process, PFO-DBT nanofibres are formed to coat the pores’ wall and replicated the Y-branched nanopores for the production of Y-shaped PFO-DBT nanotubes. The effects of solution annealing and aging process are essential for the improvement on the morphological, structural, and optical properties of Y-shaped PFO-DBT nanotubes.

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Yang, M. X., Gang Yang, Zheng Dong Liu, Cun Yu Wang, and C. X. Huang. "Microstructures and Tensile Properties of Maraging Steel Processed by Equal-Channel Angular Pressing." Materials Science Forum 667-669 (December 2010): 421–26. http://dx.doi.org/10.4028/www.scientific.net/msf.667-669.421.

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An 18Ni (C-250) maraging steel was successfully processed by equal channel angular pressing (ECAP) for a single pass at room temperature. Microstructural observations showed that the martensite laths of 18Ni maraging steel were elongated to more narrow bands with a width of 100-200 nm after ECAP deformation. After ageing treatment, many nano-sized precipitates distributed uniformly within the refined martensite lathes. In comparison with the tensile strength (1940 MPa) of general used steel (solution + aging treatment), the tensile strength of the sample processed by ECAP and subsequent aging treatment was enhanced for more than 100 MPa (above 2050 MPa). The enhancement of tensile properties was attributed to microstructural refinement and uniformly distributed nano-precipitates.

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Zhou, De Jie, and Nian Feng Han. "Micron Fly Ash/SBS Modified Bitumen: Preparation and Aging Property." Applied Mechanics and Materials 99-100 (September 2011): 1199–202. http://dx.doi.org/10.4028/www.scientific.net/amm.99-100.1199.

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Abstract. Micron fly ash/SBS modified bitumen composites were prepared by melt intercalation. The physical properties and ageing properties of micron fly ash/SBS modified bitumen were investigated. The results showed that micron fly ash/SBS modified bitumen exhibited a decreasing penetration, an increasing softening point, and a decreasing ductility. Compared with that of SBS modified bitumen, the anti-aging property of the micron fly ash/SBS modified bitumen becomes worse.

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Zhang, Xuemei, and Inge Hoff. "Comparative Study of Thermal-Oxidative Aging and Salt Solution Aging on Bitumen Performance." Materials 14, no. 5 (March 3, 2021): 1174. http://dx.doi.org/10.3390/ma14051174.

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The aging of bitumen is detrimental to the durability and service life of asphalt pavement. Previous studies found that bitumen was suspected to be aged by not only thermal oxidation but also solution immersion. This research aims to compare the effect of thermal-oxidative aging and salt solution aging on bitumen performance. For this purpose, a thin film oven test (TFOT) and pressure aging vessel aging (PAV) were selected as thermal-oxidative aging, and 10% NaCl aging and 10% CaCl2 aging were selected as salt solution aging. The morphology, oxygen content, physical properties, low-temperature properties, and high-temperature properties of bitumen were analysed by employing scanning electron microscopy with an energy dispersive spectrometer (SEM-EDS), physical tests, a bending beam rheometer (BBR), and a dynamic shear rheometer (DSR). Test results show that both thermal-oxidative aging and salt solution aging had similar influencing trends in the oxygen content, physical, low-temperature, and high-temperature properties of bitumen but had different changes in morphology. The aging degrees caused by four kinds of aging methods were obtained based on the summed values of the absolute aging factor of all parameters: PAV > 10% NaCl > TFOT > 10% CaCl2. The conclusions could provide a theoretical basis to establish a standard for the solution aging of bitumen.

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He, Xin, Qinglin Pan, Hang Li, Zhiqi Huang, Shuhui Liu, Kuo Li, and Xinyu Li. "Effect of Artificial Aging, Delayed Aging, and Pre-Aging on Microstructure and Properties of 6082 Aluminum Alloy." Metals 9, no. 2 (February 2, 2019): 173. http://dx.doi.org/10.3390/met9020173.

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Three different aging treatments including single-aging, delayed-aging, and pre-aging were carried out on 6082 extruded profiles after solution heat treatment, then their hardness, tensile strength, and microstructure were tested. The experimental results reveal that the properties and microstructure changes during single-aging. Based on this, the negative effects of room temperature delay and the results of short-term pre-aging treatments used in the experiment to improve this phenomenon have been concluded.

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Zhang, Shi Xing, Gang Yi Cai, and Hai Hong Wu. "Effects of Solution and Two-Stage Ageing Treatment Process on Microstructure and Properties of 6061 Aluminum Alloy." Advanced Materials Research 335-336 (September 2011): 822–25. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.822.

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Comprehensive performance of 6061 aluminum alloy was improved by solution treatment and two-step ageing treatment in this paper . The effects of different thermal processing parameters on the microstructure and mechanical properties of 6061 aluminum alloy were studied. The experimental results show that the optimal process of solution treatment for 6061 aluminum alloy is heated at 500°C for 10min. After first-stage aging, the hardness measurements and microstructure analysis results show that the hardness increased with increasing aging temperature, and reached peak value at temperature 180°C for 10h, while in the second-stage ageing treatment, the sample got the ageing peak value at 220°C for 1h. After two-stage treatment, the grains of 6061 aluminum alloy became uniform and fine and the second phase distributed along the grain boundary and play an important role of dispersion strengthening. Above all, the optimal heat treatment process of 6061 aluminum alloy is solution treated at 500°C for 10min, as well as ageing at 180°C, 10h and 220°C, 1h

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Rahman, Nazia, Mubarak A. Khan, Ruhul A. Khan, M. Z. I. Mollah, and Tofail A. Chowdhury. "Photocuring of Gelatin Films with TMPTMA: Effect on Aging Properties." Advanced Materials Research 123-125 (August 2010): 343–46. http://dx.doi.org/10.4028/www.scientific.net/amr.123-125.343.

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Gelatin films were prepared from granular gelatin by casting. Gelatin films were modified by photocuring with a trifunftional monomer Trimethylolpropane trimethacrylate (TMPTMA). Optimum condition for photocuring were established. Water aging of untreated and modified gelatin films was studied. Thermal aging of untreated and TMPTMA treated films were determined at different temperatures (50°C, 70°C and 100°C) for 60 min. pH aging of gelatin films were investigated in different pH solutions (3.2, 4.1, 4.8, 6.9, 9.2, 12.2) for 1min. Water aging, thermal aging and pH aging showed that the TMPTMA grafted gelatin films experienced less deterioration of mechanical properties than pure gelatin films.

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Nam, Jeong Pyo, Sung Ho Yoon, Young Eun Hwang, Hong Li, and Qing Fen Li. "An Analysis of Aging Characteristics of Tilting Train under Accelerated Aging Environment." Key Engineering Materials 385-387 (July 2008): 33–36. http://dx.doi.org/10.4028/www.scientific.net/kem.385-387.33.

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In this study, the effect of combined environmental factors such as ultraviolet ray, high temperature and high moisture on mechanical and thermal analysis properties of glass fabric and phenolic composites are evaluated through a 2.5KW accelerated environmental aging tester. The environmental factors such as temperature, moisture and ultraviolet ray applied of specimens. A xenon-arc lamp is utilized for ultraviolet light and exposure time of up to 3000 hours are applied. Several types of specimens - tensile, bending, and shear specimens that are warp direction and fill direction are used to investigate the effects of environmental factors on mechanical properties of the composites. Mechanical degradations for tensile, bending and shear properties are evaluated through a Universal Testing Machine (UTM). Also, storage shear modulus, loss shear modulus and tan δ are measured as a function of exposure time through a Dynamic Mechanical Analyzer (DMA). From the experimental results, changes in material properties of glass fabric and phenolic composites are shown to be slightly degraded due to combined environmental effects.

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Zhuang, Rong Hua, Jian Ying Yu, Heng Chang, Yan Zeng, and Xue Yong Lan. "Effect of Warm Mix Agent on Physical and Aging Properties of Crumb Rubber Modified Bitumen." Materials Science Forum 944 (January 2019): 1226–33. http://dx.doi.org/10.4028/www.scientific.net/msf.944.1226.

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The effects of modified natural zeolite warm mix agent (MNZWMA) and organic viscosity reducing warm mix agent (OVRWMA) on the physical properties, short term thermal oxidation aging, long term thermal oxidation aging and UV aging properties of the crumb rubber modified bitumen (CRMB) were investigated. The results showed that MNZWMA and OVRWMA could improve the high temperature stability and the low temperature crack resistance of CRMB, respectively. During the short term thermal oxidation aging, long term thermal oxidation aging and UV aging, OVRWMA increased softening point increment (SPI) and viscosity aging index (VAI) of CRMB, however, MNZWMA decreased its SPI and VAI. The analysis of FTIR spectra indicated that MNZWMA reduced the formation of carbonyl groups and sulfoxide groups, but OVRWMA accelerated the formation of carbonyl groups and sulfoxide groups to some extent during ultraviolet aging. Therefore, MNZWMA could improve the anti-aging properties, and OVRWMA was not conducive to the anti-aging properties of CRMB.

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Wang, Wei, Jian Ying Yu, Yi Yi, and Xiao Chen. "Effect of De-Icing Additives on Aging Properties of Bitumen." Materials Science Forum 847 (March 2016): 418–24. http://dx.doi.org/10.4028/www.scientific.net/msf.847.418.

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Effect of three de-icing additives: NaCl, wrapped NaCl (W-NaCl) and Layered double hydroxides (LDHs) on thermo-oxidative and ultraviolet aging properties of bitumen were investigated by thin film oven test (TFOT), pressure aging vessel (PAV) and ultraviolet (UV) radiation test. The experimental result illustrated that compared with bitumen with MF, the softening point and viscosity of bitumen with NaCl and W-NaCl increased and the ductility decreased distinctly after TFOT, PAV and UV aging, indicating that NaCl and W-NaCl accelerated the aging of bitumen. However, for bitumen with LDHs, the softening point and viscosity decreased significantly, the ductility increased after aging, which demonstrated that the anti-aging properties of bitumen were improved effectively by LDHs.

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Pierpaoli, Walter. "Aging-Reversing Properties of Thyrotropin-Releasing Hormone." Current Aging Science 6, no. 1 (July 1, 2013): 92–98. http://dx.doi.org/10.2174/1874609811306010012.

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Journal articles on the topic 'Aging properties'

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