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. 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...此,可以用Paris方程拟合曲线. 图5 热处理试样的拉伸断口形貌 Fig. 5 Fracture morphologies of NAB alloys under different heat treatments 图6 NAB疲劳裂纹扩展曲线 Fig. 6 Fatigue crack growth curves of NAB alloy......
to the logarithmic expression of loading rate. (3) For Huanglong limestone, when the growth velocity of crack is lower than 100 m/s, the energy release rate slightly decreases with increasing the growth velocity of crack. However, when the growth velocity of crack is higher than 1 000 m/s, the energy release rate dramatically decreases with an increase in the crack growth velocity. Key words: fracture......
into the fatigue crack tip of AZ31 magnesium alloy, the phosphate deposition behavior and effects of the phosphate film on the fatigue crack propagation rate at the fatigue crack tip of AZ31 magnesium alloy were... fatigue crack propagation rate, stress-intensity factor and fatigue cycle without and with inmersing phosphate 2.3 裂纹尖端微观形貌和物相组成分析 未渗注磷酸盐转化液的疲劳裂纹扩展试样裂纹尖端的微观形貌如图3所示.图3(a)所示为裂纹尖端的整体微观形貌,从图中可以看到,疲劳裂纹尖......
growth of specimens with different fatigue pre-cracking lengths by EN and scanning Kelvin probe (SKP) method [13]. It is expected that the study will make a contribution to detecting crack propagation. 2...; Abstract: The fatigue pre-cracking 304 stainless steel (SS) specimens with lengths of 1.002 mm (L-crack) and 0.575 mm (S-crack) were prepared. Their corrosion behavior was studied......
, the experiment showed that crack stop hole could only prevent cracks from growing and had no influence on crack growth rate. Key words: steel bridge deck; fatigue crack; stop hole; drilling method; hole... regeneration. Thus a crack stop hole, and the manner of its insertion, had no influence on crack growth rate. References [1] MIKI C. Fatigue damage in orthotropic steel bridge decks and retrofit works [J......
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stir welding; aluminium alloy; fatigue; crack growth rate; corrosion 1 Introduction High strength aluminium alloys are known to be attractive materials for aerospace industry because of their high... results in an increased strain rate of the material, this finally leads to the size variation of dimples. 3.2 Results from crack propagation tests Fatigue crack growth rates in the base materials......
crack length, c0, respectively. The crack growth rates along the length and depth directions in the process of coalescence on double collinear cracks were also studied.Key words:large-module rack; double cracks; fatigue crack propagation; crack spacing threshold; moving load......
喷射沉积SiCP/Al-7Si复合材料的疲劳裂纹扩展李微1,陈振华1,陈鼎1,滕杰1(1.湖南省长沙市湖南大学材料科学与工程学院)摘 要:采用紧凑拉伸试样进行恒载和降K控制的拉-拉疲劳实验,研究了喷射沉积SiCp/Al-7Si复合材料及其基体的疲劳裂纹扩展行为.通过金相显微镜和扫描电镜观察了复合材料及其基体的组织和疲劳裂纹扩展形貌,研究了SiC颗粒对复合材料疲劳裂纹扩展机制的影响.结果表明:复合材料在任何相同的ΔK水平下其抗疲劳裂纹扩展能力优于基体材料,并表现出较高的疲劳门槛值.其原因是复合材料中裂纹裂尖遇到增......
that the fatigue crack growth rate of the HIPed samples is higher than that of the as-fabricated one under certain stress intensity factor(DK\18 MPa m1/2).With further increase in DK,the fatigue crack growth...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......