多耦合拘束效应对P92钢蠕变裂纹扩展行为的影响

Dependence of Creep Crack Growth Behavior of P92 Steel on Multiple Coupling Constraints

基于断裂力学理论,针对不同面内拘束效应下P92钢高温蠕变裂纹扩展(Creep crack growth,CCG)进行了数据模拟与分析。研究发现不同的拘束效应对CCG行为有着各异的影响,主要分析了试样几何形状、尺寸以及初始裂纹深度等对CCG行为的影响,并且着重研究比较这3种耦合拘束效应对CCG行为的影响程度。基于多种耦合拘束对CCG行为的影响程度做了横向比较,研究发现:试样几何形状对CCG行为的影响程度要大于几何尺寸,试样尺寸和初始裂纹深度对CCG行为的影响程度相似,试样形状比初始裂纹深度的影响程度更大。

Based on fracture mechanics,the creep crack growth（Creep crack growth,CCG）of P92 steel under the high temperatures was simulated and analyzed with different in-plane constraint effects.The study discovers that different constraint effects have an important influence for the behavior of CCG.The influence of specimen geometric shape,size and initial crack depth,especially their coupling constraintson on the behavior of CCG were analyzed.To compare the characteristics of the behavior of CCG under various coupling constraints,some results were found as follow.The effect of specimen geometry on the behavior of CCG is greater than the geometric size,and the effects of specimen size and the initial crack depth on the behavior of CCG are similar.The effects of specimen geometry on the behavior of CCG is greater than the initial crack depth.