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vibration sources. Stress wave propagation in initially stressed rock mass may degrade the mechanical properties, and hence cause instability of rock [3-5]. Researches on wave propagation in pre-stressed... properties [11-15]. On the other hand, the failure mechanism of rock under initial stress and dynamic stress loading has been studied from both experiments and numerical simulations. For instance, LI et al......
J. Cent. South Univ. (2018) 25: 218-229 DOI: https://doi.org/10.1007/s11771-018-3731-x Effective stress law for rock masses and its application in impoundment analysis based on deformation..., are hardly to be explained by the conventional method. The scientific understanding of water effects during impoundment and their hazards to hydraulic structure are needed. The effective stress law......
Dielectric and Ferroelectric Properties of Complex Perovskite Ceramics Under Compressive Stress N. Triamnak1,A. Ngamjarurojana1,S. Ananta1,Y. Laosiritaworn1,M. Unruan, S. Wongsaenmai1,R. Yimnirun1... investigated under the influence of the compressive stress. The results showed that the dielectric properties, i.e. dielectric constant ( εr ) and dielectric loss ( tan δ), and the ferroelectric......
the distribution of the stress applied to the specimen surface was unknown, the specimen and loading set-up were modeled as a whole (Fig.2). Table 1 lists the mechanical properties of materials, sandstone for specimen and steel for loading grip. Table 1 Mechanical properties of materials Fig.3 illustrates typical contours of the maximum tensile stress s1 and shear stress tress tmax......
J. Cent. South Univ. (2016) 23: 2763-2770 DOI: 10.1007/s11771-016-3338-z Microstructure and properties of low-temperature aged Dy-doped Nd-Fe-B magnet WANG Xiao-li(王晓丽)1, 2, HU Qing-xian(胡庆贤)1, DING... was developed by the optimizing ageing process. The experimental results show that there is no difference in microstructures, crystal orientation, magnetic and mechanical properties between the low-temperature......
J. Cent. South Univ. Technol. (2008) 15(s1): 397-401 DOI: 10.1007/s11771-008-387-y Effects of stress conditions on rheological properties of granular soil in large triaxial rheology laboratory..., especially the stress level were the critical influencing factors of the rheological deformation properties. Under the low stress level (S=0.1), the granular soil showed the elastic properties......
for the improvement of the properties. Adding 3%(mass fraction) nano SiO2 is the best for the improvement of both modulus of rupture(MOR) and modulus of elasticity(MOE) of the boards formed... Mechanical properties of nano SiO2 filled gypsum particleboard LEI Wen(雷 文)1, DENG Yu-he(邓玉和)2, ZHOU Mei(周 梅)2, XUAN Ling(宣 玲)2, FENG Qian(冯 谦)3 1.College of Information Science and Technology......
]. Previous studies by HORTEN et al [5-8] have shown that the minor elements P and B have a dramatic effect on the elevated temperature creep and stress rupture properties of 718 alloy. Recent work has shown.... [9] CAO W D, KENNEDY R L. Improving stress rupture life of alloy 718 by optimizing Al, Ti, P and B contents[A]. Superalloys 718, 625, 706 and Various Derivatives[C]. Loria E A. Warrendale, PA: TMS......
deformation between the recrystallized layer and the matrix,and stress concentration caused by notch effect resulted in the decrease in creep rupture life of the single-crystal superalloy.关键词:...Effect of surface recrystallization on the creep rupture property of a single-crystal superalloyZHANG Binga,LIU Changkuia,LU Xinb,TAO Chunhua,and JIANG Taoa a AVIC Failure Analysis Center,Beijing......
) Abstract: The AZ31 magnesium alloy was extruded by dual-directional extrusion (DDE) at different temperatures. Then, the microstructures, mechanical properties, tension and compression asymmetry and the rupture behaviors were studied. The results indicate that, compared with homogenized samples, the grain sizes of the extruded ones are all refined, thereby improving the mechanical properties......