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Comparison among estimation methods of C* parameter for axially oriented external surface crack in cylinders

机译：圆柱轴向外表面裂纹C *参数估计方法的比较

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摘要

C* is usually used to describe the creep crack growth. ASTM E1457 allows C* to be calculated from creep load line displacement rate. However in components it is difficult or impossible to measure load line displacement rate. Therefore for the components C* must be determined by finite element methods or reference stress concepts. Estimates of C* obtained by reference stress methods will depend on the collapse mechanism adopted and therefore several estimations are proposed. This paper presents a numerical study of non-linear fracture mechanics parameter predictions under elevated temperature for axially oriented external surface crack in cylinder. Comparison of C* calculated from FE analysis and different reference methods is conducted. The values of C* obtained from the API579 net section solution are also found to be slightly conservative and give the closest agreement to the F.E. contour integral C*. In addition, the comparison between C* of homogeneous material and TYPE IV cracking is conducted. The difference between homogeneous material and TYPE IV cracking is almost negligible and therefore the reference stress solutions for homogenous material could be applied to estimate C* for TYPE IV cracking.
机译：C *通常用于描述蠕变裂纹的增长。 ASTM E1457允许根据蠕变载荷线位移率计算C *。但是，在组件中很难或不可能测量负载线的位移率。因此，对于零件C *，必须通过有限元方法或参考应力概念来确定。通过参考应力方法获得的C *估计值取决于所采用的坍塌机制，因此提出了几种估计方法。本文提出了在高温下圆柱轴向外表面裂纹非线性断裂力学参数预测的数值研究。进行了由有限元分析和不同参考方法计算出的C *的比较。还发现从API579净截面解决方案获得的C *值有些保守，并且与F.E.轮廓积分C *最接近。此外，还进行了均质材料C *与Ⅳ型裂纹的比较。均质材料与Ⅳ型裂纹之间的差异几乎可以忽略不计，因此，均质材料的参考应力解可用于估算Ⅳ型裂纹的C *。

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