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Fatigue crack propagation behaviour of pressurised elbow pipes under cyclic bending

机译：循环弯曲下加压弯头管的疲劳裂纹繁殖行为

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摘要

Fatigue crack propagation behaviours of Z2CND18.12N austenitic stainless steel pressurised elbow pipes were studied under cyclic bending. The results show that the evolutions of crack depth with the number of cycles at both intrados and crown present logarithmic growth, while the evolutions of crack length with the number of cycles present exponential growth. The aspect ratios of crack increment, Delta(2c)/Delta a versus the number of cycles at intrados and crown are linear. J-integrals of the corresponding crack size were solved by numerical method. The evolutions of crack depth growth rate, da/dN with J-integral range, Delta J at intrados and crown conform to the unified Paris law.
机译：在循环弯曲下研究了Z2CND18.12N奥氏体不锈钢加压弯头管的疲劳裂纹传播行为。结果表明，随着克拉地球菌和冠的循环次数的裂缝深度的演变为对数生长，而具有循环次数的裂缝长度的演变存在指数增长。裂纹增量，Delta（2C）/ Delta A与克拉内县和冠处的循环次数的纵横比是线性的。通过数值方法解决了相应的裂纹尺寸的J-Integlats。裂纹深度生长速率的演变，DA / DN，J-Integral Range，Intrado和Crown的Delta J符合统一的巴黎法律。

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