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Effects of creep properties of materials on creep crack-tip constraint parameter R*

机译:材料的蠕变特性对蠕变裂纹尖端约束参数R *的影响

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摘要

Extensive finite element analyses have been conducted to investigate the effect of creep properties of materials on the creep crack-tip constraint parameter R*. The results show that the parameter R* increases with increasing power law creep stress exponent n of materials, and it is sensitive to lower n values and lower in-plane and out-of-plane constraints. In the engineering estimations of the creep constraint parameter R*, only the creep exponent effect needs to be considered for cracked components with lower exponent n and lower constraint, and the Norton's coefficient A of power law creep materials can be ignored due to its insensitivity to the R*. The R*-n relation formulae have been established for single-edge-notched tension specimen (it has similar constraint level to pressurised pipes) with different in-plane and out-of-plane constraints, and they may be used to estimate the creep crack-tip constraint levels for cracked pipes with lower exponent n and lower constraint.
机译:进行了广泛的有限元分析,以研究材料的蠕变特性对蠕变裂纹尖端约束参数R *的影响。结果表明,参数R *随材料幂律的蠕变应力指数n的增加而增加,并且对较低的n值以及较低的面内和面外约束敏感。在蠕变约束参数R *的工程估算中,对于具有较低指数n和较低约束的裂纹组件,仅需要考虑蠕变指数效应,并且幂律蠕变材料的诺顿系数A可以忽略,因为它对R *。已经建立了具有不同面内和面外约束的单边缺口拉力试样(其压力水平与受压管相似)的R * -n关系公式,它们可用于估算蠕变指数n较低且约束较低的裂纹管的裂纹尖端约束级别。

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