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of additional stress intensity factor at the branch crack cusp were also obtained considering rock bridge damage. The damage fracture failure criterion was set up in which the suppositional stress intensity factor at the branch crack cusp was researched as an index when branch crack propagation length reached critical length. The results show that saturated pressure p, the ratio......
裂纹尖端的几何曲线,如图6(b)所示.求得一定长度下裂纹尖端处的应力强度因子后,就可以通过ZHENG-HIRT[15]疲劳裂纹扩展速率公式(2)计算出一定循环次数dN下的裂纹扩展长度da. 图6 周向加载下的裂纹扩展求解模型 Fig. 6 Crack propagation solution model under circumferential loading (2) 式中:da为裂纹扩展的长.../b下,棒料裂纹的疲劳扩展路径示意图.图8中的不同颜色的线条代表不同的裂纹扩展阶段,从外到里依次代表裂纹扩展的先后顺序,最里面的线条对应棒料最后的瞬断阶段.从图8可以看出:随着e/b增大,瞬断区的偏心程度越大；同时,随着e/b增大,瞬断区也越偏离圆形,而成椭圆状. 图8 不同偏心距下裂纹疲劳扩展路径示意图 Fig. 8 Schematic diagrams of crack fatigue......
South University, Changsha 410083, China) Abstract: The effects of artificial ageing on the fatigue crack propagation and room mechanical properties of 2524 aluminum alloy were investigated..., both of the high temperature-short time artificial aged and naturally aged samples have the similar tensile strength. The fatigue crack growth rate tests indicates that the fatigue crack growth of high......
Physical Essence of Long Fatigue Crack Growth Behavior for Aluminum－lithium Alloy陈铮,倪永峰摘 要:ＰｈｙｓｉｃａｌＥｓｓｅｎｃｅｏｆＬｏｎｇＦａｔｉｇｕｅＣｒａｃｋＧｒｏｗｔｈＢｅｈａｖｉｏｒｆｏｒＡｌｕｍｉｎｕｍ－ｌｉｔｈｉｕｍＡｌｌｏｙＣｈｅｎＺｈｅｎｇａｎｄＮｉＹｏｎｇｆｅｎｇ(陈铮)(倪永峰)(ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳ...关键词:......
Simulation of crack coalescence mechanism underneath single and double disc cutters by higher order displacement discontinuity methodMohammad Fatehi Marji(1Faculty of Mining & Metallurgy, Yazd University, Yazd, Iran)Abstract:The present research is focused on the numerical crack coalescence analysis of the micro-cracks and cracks produced during the cutting action of TBM disc cutters......
Effect of HIP Treatment on Fatigue Crack Growth Behavior of Ti–6Al–4V Alloy Fabricated by Electron Beam MeltingYan Liu1,Jun Zhang1,Shu-Jun Li2,Wen-Tao Hou2,Hao Wang2,Qin-Si Xu2,Yu-Lin Hao2,Rui Yang21...="ChDivSummary">The effect of hot isostatic pressing treatment on the fatigue crack growth behavior of Ti–6Al–4V alloy fabricated by electron beam melting was investigated.The results indicate......
Trans. Nonferrous Met. Soc. China 31(2021) 1023-1030 Thermal fatigue crack growth behavior of ZCuAl10Fe3Mn2 alloy strengthened by laser shock processing Guang-lei LIU1,2, Yu-hao CAO1, Kun YANG1, Wei..., and thermal fatigue properties of a ZCuAl10Fe3Mn2 alloy was investigated to improve the thermal fatigue performance and decrease the surface crack of high-temperature components. The microstructure and crack......
Influence of Rare Earth Element on Short Fatigue Crack Threshold for Al－Li Alloy 2090陈铮,倪永峰,何明摘 要:ＩｎｆｌｕｅｎｃｅｏｆＲａｒｅＥａｒｔｈＥｌｅｍｅｎｔｏｎＳｈｏｒｔＦａｔｉｇｕｅＣｒａｃｋＴｈｒｅｓｈｏｌｄｆｏｒＡｌ－ＬｉＡｌｌｏｙ２０９０ＣｈｅｎＺｈｅｎｇ(陈铮)；ＮｉＹｏｎｇ－Ｆｅｎｇ(倪永峰)；ＨｅＭｉｎｇ(何明)；(Ｄｅｐａｒｔｍｅｎｔ...关键词:......
Fatigue Crack Growth Behavior of Different Zones in an Annealed Automatic Gas Tungsten Arc Weld Joint of TA16 and TC4 Titanium Alloys邵玲1,吴素君2,PENG Wenya3,DATYE Amit4,JU Hongbo5,LIU Ying61. Research... gas tungsten arc weld joint of TA16 and TC4 titanium alloys,the mechanical property of them was assessed under fatigue crack growth rate tests.For evaluation of fatigue crack growth rate,three points......
