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In-plane and out-of-plane constraint effects on creep crack growth rate in Cr-Mo-V steel for wide range of C*

机译：宽C *范围内面内和面外约束对Cr-Mo-V钢蠕变裂纹扩展速率的影响

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摘要

In this work, the stress dependent creep ductility and strain rate model have been implemented in a ductility exhaustion based damage model and the creep crack growth (CCG) rates of a Cr-MoV steel in compact tension (C(T)) and middle tension (M(T)) specimens with different thicknesses and crack depths have been simulated over a wide range of C*. The effects of in-plane and out-of-plane constraints on CCG rates are examined. The results show that the in-plane and out-of-plane constraint effects on CCG rate are more pronounced for the high constraint specimen geometry (C(T)), while such effects are less significant for low constraint specimen geometry (M(T)). The constraint effects on CCG rates mainly occur in low and transition C* regions and the CCG rate increases with increasing in-plane and out-of-plane constraints. There exists interaction between in-plane and out-of-plane constraint in terms of their effects on CCG rate. The higher in-plane constraint strengthens the out-of-plane constraint effect on CCG rate and higher out-of-plane constraint also strengthens the in-plane constraint effect on CCG rate. The constraint effects on creep crack growth behaviour for a wide range of C* mainly arise from the interaction of crack-tip stress states and stress dependent creep ductility of the steel in different C* levels.
机译：在这项工作中，已经在基于延性穷竭的损伤模型中实现了应力相关的蠕变延展性和应变率模型，以及在紧凑张力（C（T））和中张力下Cr-MoV钢的蠕变裂纹扩展（CCG）率。 （M（T））具有不同厚度和裂纹深度的试样已在宽范围的C *上进行了模拟。检验了面内和面外约束对CCG速率的影响。结果表明，高约束试样几何形状（C（T））对CCG速率的面内和平面外约束效应更为明显，而对于低约束试样几何形状（M（T ））。对CCG速率的约束影响主要发生在低C *和过渡C *区域，并且CCG速率随着平面内和平面外约束的增加而增加。就其对CCG速率的影响而言，平面内约束和平面外约束之间存在相互作用。较高的平面内约束会增强CCG速率的平面外约束效果，而较高的平面外约束也会增强CCG速率的平面内约束效果。宽范围C *对蠕变裂纹扩展行为的约束作用主要来自裂纹尖端应力状态与不同C *水平下钢的应力相关蠕变延展性的相互作用。

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