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of the compression fracture, the length range of crack fracture in different stress states was solved, the mathematical expectation of crack length was calculated by probability statistics... coefficient and angle on rock strength. When the friction coefficient is 0, the corresponding angle of minimum strength of rock is 45°. With the increase of the friction coefficient, the crack angle......
Optimization of press bend forming path of aircraft integral panel YAN Yu(阎 昱), WAN Min(万 敏), WANG Hai-bo(王海波), HUANG Lin(黄 霖) School of Mechanical Engineering and Automation, Beihang...; Abstract: In order to design the press bend forming path of aircraft integral panels, a novel optimization method was proposed, which......
has a much wider striation space due to possessing a higher FCGR. 3.6 Fatigue crack propagation path Fig.6 shows the crack propagation paths developed in T3 and T6 conditions, respectively. Both paths are transgranular, which are in agreement with Figs.4 and 5. The crack deflects encountering grain boundary and exhibits Zigzag deflection. The crack propagation path in T3 condition exhibits......
in a straight line along the surface of the prefabricated crack after it starts from the tip of the prefabricated crack, and the crack propagation path is relatively zigzag. However, with the increase of the loading rate, the crack propagation path becomes straight. This result is consistent with result of ZHANG et al [9]. At the same time, ZHANG et al also observed the fracture surface of rock......
Crack branching mechanism of rock-like quasi-brittle materials under dynamic stressTANG Chun-an(唐春安), YANG Yue-feng(杨岳峰)(Center for Rock Instability and Seismicity Research, Dalian University of Technology, Dalian 116024, China)Abstract:The cracking patterns of a thin sheet with a pre-existing crack subjected to dynamic loading are numerically simulated to investigate the mechanism of crack......
and stretching were conducted on hot-rolled and annealed Ti/Al/Mg/Al/Ti laminates, with a focus on crack initiation and propagation of intermetallics and component layers, which helps to clarify... of component layers are observed at the late deformation stage, and the sequence is Al, Mg and Ti layers, resulting from their strength. Angle between crack propagation direction and stretching......
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. 8 Fatigue crack growth path of NAB alloys 图9 不同热处理状态下NAB合金在3.5%NaCl溶液中的动电位极化曲线 Fig. 9 Potentiodynamic polarization curves of NAB alloys under different heat treatments in 3.5.... 表1 镍铝青铜热处理工艺 Table 1 Heat treatment process of NAB 图1 疲劳裂纹扩展试样 Fig. 1 Schematic diagram of NAB specimen for fatigue crack growth test (Unit: mm) 2 结果与分析 2.1 热处理对材......
Crack detection of reinforced concrete bridge using video imageXU Xue-jun(许薛军)1, 2, ZHANG Xiao-ning(张肖宁)1(1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China;2. Administration Bureau for Highway of Guangdong Province, Guangzhou 510075,China)Abstract:With the digital image technology, a crack detection method of reinforced concrete......
Finite Element Simulations of Crack Propagation in Al2O3/6061Al CompositesGalina Lasko,Ulrich Weber,Siegfried SchmauderInstitut für Materialprüfung,Werkstoffkunde und Festigkeitslehre (IMWF... of the microstructure is evaluated in consideration of the path and the amount of damage as well as the stress–strain performance of the microstructure. The damage behaviour of the ductile matrix has been......