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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......
deformation degree in impact crack in impact load time interval. The experimental results indicate that the impact fatigue crack growth rate decreases owing to the decrease of plastic deformation. Through... and crack propagation velocity were deduced. The effects of impact pattern characteristic parameters such as impact range and time interval on impact fatigue crack growth and propagation rates were......
. The experimental results indicated that the corrosion fatigue crack growth rate decreased with the increasing loading frequency,and in a corrosive environment,the crack growth rate was slightly... was carried out to analyze the corrosion fatigue crack growth behavior and the predicted crack growth curve was in good agreement with the experimental results.关键词:......
. 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......
, 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......
开程度,故弹性模量大的材料具有较高的裂纹扩展抗力. 图2 温度对GH4698合金疲劳寿命和裂纹扩展速率的影响 Fig. 2 Effects of temperature on lifetime (a-N) and fatigue crack growth rate (FCGR) of GH4698 alloy 除了温度影响弹性模量E对裂纹扩展速率产生影响以外,另一方面,随...:A Fatigue crack growth behavior of GH4698 alloy WANG Huan1, YUAN Chao1, GUO Jian-ting1, QIN He-yong2 (1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; 2. High......
；当e/b从0增加到0.12时,棒料的疲劳时间减小1/4；当e/b＞0.12时,名义疲劳裂纹扩展时间变化趋于平缓. 图10 棒料疲劳裂纹扩展时间随着切口偏心距的变化 Fig. 10 Fatigue crack growth time of bar as a function of eccentricity of incision 4 试验与讨论 为了验证前面提出的理论,分别对不同偏心距情况下,材料... [15] KIM I, ZHAO Yongjian, CHOI B H, et al. Numerical analysis of asymmetric fatigue crack growth behaviors of circular notched bar specimen resulting from various geometric misalignments[J......
显微组织对TC4ELI合金疲劳裂纹扩展路径及扩展速率的影响马英杰1,李晋炜1,雷家峰1,唐振云2,刘羽寅1,杨锐2(1.辽宁省沈阳市科学院金属研究所2.中航工业北京航空制造工程研究所)摘 要:利用SEM观察了疲劳裂纹在具有片层组织的TC4ELI合金中的扩展路径,通过统计疲劳裂纹与α片层所呈的角度,分析了α和β两相晶体学取向对疲劳裂纹扩展路径的影响.基于对疲劳裂纹扩展路径的研究,测试并讨论了片层组织中晶粒和α片层对近门槛值阶段及Paris区阶段疲劳裂纹扩展速率的影响.研究表明,疲劳裂纹在片层组织中扩展时,疲劳裂纹......
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......
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......
