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of strata is related to the strata stress factor and the ratio of the minimum load on the pillar’ two ends to the maximum one; and the distribution features of stress factors and the sizes...Calculation and analysis of stress in strata under gob pillarsYANG Jing-xuan(杨敬轩)1, 2, LIU Chang-you(刘长友)1, 2, YU Bin(于斌)1, 3, WU Feng-feng(吴锋锋)1, 2(1. School of Mines, China University of Mining......
strain gauges of every measuring point are listed in Table 2. Table 2 Strain actually induced by stress relief Through confining pressure calibration test, the elastic modulus and Poisson ratio of rock mass were measured. According to the strain, elastic modulus and Poisson ratio, the in situ stress values of every measuring point were obtained. In order to reduce error, F-test was adopted......
Effect of stress ratio on very high cycle fatigue properties of Ti-10V-2Fe-3Al alloy with duplex microstructureYing Wu1,Jianrong Liu1,Hao Wang1,Shaoxuan Guan1,Rui Yang1,Hongfu Xiang21. Institute... is reported. Two transitions of fatigue crack initiation mechanism, from internal crack initiation to surface crack initiation and from αp cleavage to αs/βdecohesion, occur when the stress ratio(R......
Effects of stress ratio on the temperature-dependent high-cycle fatigue properties of alloy steelsZhi-yang Lü1,Ao-shuang Wan1,Jun-jiang Xiong1,Kuang Li1,Jian-zhong Liu21. School of Transportation Science and Engineering, Beihang University2. Beijing Institute of Aeronautical Materials摘 要:This paper addresses the effects of stress ratio......
Effect of CaO content on residual stress of CAS glass-ceramic XIE Jun, CHENG Jin-shu, LONG Xin-jiang, YANG Shu-zhen Key Laboratory of Silicate Materials Science and Engineering, Wuhan University... the residual stress in the system. Therefore X-ray diffraction (XRD) ‘sin2ψ’ method was used to calculate the residual stress in samples containing various contents of CaO. The relationship between......
Influence of Stress Ratio and Loading Condition on Near-threshold Fatigue Crack Growth BehaviourB.Weiss,R.Stickler摘 要:<正> Near-threshold fatigue... was derived.Compared with the conventional closure evaluation method,the pro-posed new closure evaluation method can generally interpret the dependence of the fatigue thresh-old on stress ratio and loading condition......
J. Cent. South Univ. (2020) 27: 963-972 DOI: https://doi.org/10.1007/s11771-020-4344-8 Dynamic response and failure of rock in initial gradient stress field under stress wave loading WENG Lei(翁磊)1... GmbH Germany, part of Springer Nature 2020 Abstract: Once an opening is created in deep underground, the stresses surrounding the opening will be redistributed, inducing a gradient stress field......
Microstructure and mechanical properties of AZ31 Mg alloy processed by high ratio extrusion CHEN Yong-jun(陈勇军), WANG Qu-dong(王渠东), LIN Jin-bao(林金宝), ZHANG Lu-jun(张陆军), ZHAI Chun-quan(翟春泉... September 2006 Abstract: The microstructure and mechanical properties of AZ31 Mg alloy processed by high ratio extrusion (HRE) were investigated. General extrusion with extrusion ratio of 7 and high......
with the use of the DEFOEM simulation software. The simulation result shows that the higher the extrusion ratio, the higher the effective stress that the glass fiber bears during extrusion. It is also observed..., the higher the extrusion ratio, the higher the effective stress that the fiber glass has suffered during extrusion. When the extrusion ratio was enhanced from 1 659 to 2 231, the effective stress......
