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数Kt由1变为3时,TC18棒材的疲劳强度由230 MPa变为115 MPa,降低了50%；而当应力集中系数Kt由3变为5时,TC18棒材的疲劳强度则由115 MPa变为50 MPa,降低了56.5%,两者相差并不十分显著. 图5 应力集中敏感因子与应力集中系数的关系 Fig. 5 Relationship between stress concentration sensitivity factor and stress concentration factor 2.3 平均应力对疲劳强度的影响 平均应力对疲劳强度的影响一般用3个常用的模型来分析,分别是Goodman(式(1)), Soderberg relation(式(2))和 Gerber parabola(式(3)). ......
that it is necessary to reduce the surface roughness of BMGs for achieving a large plasticity. Key words: bulk metallic glass; surface roughness; compressive plasticity; stress concentration 1... such a plasticity enhancement in BMGs can be attributed to the alleviation of local stress concentration by the reduced surface roughness. Inhomogeneous deformation of metallic glasses is localized in narrow......
Introduction Rockburst is a typical unstable rock failure. Specifically, under high ground-stress conditions, unloading in tunnel excavation would cause stress concentration on hard and brittle rocks... type of rockburst, generally occurs around the tunnel excavation boundary, mainly induced by the local high stress concentration and release of elastic strain energy in excavation [7]. For example......
boundaries and hydrides precipitate at grain boundaries. Consequently, the stress concentration near grain boundaries decreases the interface binding force, destroys the continuity of grain boundaries... Effect of hydrogen content and stress state on room-temperature mechanical properties of Ti-6Al-4V alloy YUAN Bao-guo(袁宝国), LI Chun-feng(李春峰), YU Hai-ping(于海平), SUN Dong-li(孙东立......
J. Cent. South Univ. (2016) 23: 1858-1862 DOI: 10.1007/s11771-016-3240-8 Effect of a novel three-step aging on strength, stress corrosion cracking and microstructure of AA7085 CHEN Song-yi(陈送义)1, 2...: The influence of a novel three-step aging on strength, stress corrosion cracking (SCC) and microstructure of AA7085 was investigated by tensile testing and slow strain rate testing combined......
the difference is defined as hydrogen-induced stress. The value of hydrogen-induced stress s* increases linearly with hydrogen concentration: s*=-0.622+2.015C0. The finite element analysis results of stress... concentration under stress-driven diffusion condition is different with the size of notch root radius. Accordingly, it is important to understand the stress-driven hydrogen diffusion and accumulation......
for determining the high-temperature creep strain; and tf is the fire time in minute. 2.3.3 Numerical modeling To avoid local stress concentration at supports and loading positions, cushion blocks were... J. Cent. South Univ. (2018) 25: 2093-2106 DOI: https://doi.org/10.1007/s11771-018-3899-0 Stress redistribution of simply supported reinforced concrete beams under fire conditions DING Fa-xing(丁发兴)1......
of alloys and destroys the integrity of the oxidation film on the matrix. The decreases of breakdown potential and stress concentration in the defect lead by applied stress can significantly affect... Localized corrosion of LY12CZ under stress in chloride media RAO Si-xian(饶思贤), ZHANG Zheng(张 峥), ZHU Li-qun(朱立群), ZHONG Qun-peng(钟群鹏) School of Material Science and Engineering, Beijing......
of both discrete material pile and surrounding soil were analyzed. Based on the elastic theory and Terzzaghi’s one dimension consolidation theory, a modificatory method for stress concentration ratio.... Key words:discrete material pile; composite foundation; stress concentration ratio; lateral deformation; aging effect ......
words: SH wave scattering; Green function; interfacial inclusion; debond; dynamic stress concentration 弹性波的散射问题一直备受科学家和工程师的关注,随着在无损检测,能源勘探,地震工程等领域的广泛应用,关于弹性波散射的研究也越来越多.早期,对弹性波散射的研究主要集中在全空间中单个简单异质体,例如圆柱空洞... and Soil Mechanics, 2013, 34(8): 2378-2384. [8] 刘殿魁, 刘宏伟. SH波散射与界面圆孔附近的动应力集中[J]. 力学学报, 1998, 30(5): 597-604. LIU Diankui, LIU Hongwei. Scattering and dynamic stress concentration of SH wave by interface......
