弯管外拱壁内表面周向裂纹的J估算方法的研究

Study on J-Estimation Schemes for Internal Circumferential Surface Cracks in Pipe Elbows

介绍了一种估算含裂纹弯管J积分的新方法:采用线弹簧壳体模型进行有限元计算求解弯管外拱壁内表面周向裂纹的J积分,而后仿照EPRI方法,给出了J估算式及其相关系数F_1和h_1;并对该J估算方法进行了分析与评价。

The line-spring shell model is introduced for calculating J-integral cracked pipe elbows. Using the result of this model and following the EPRI procedure, the coefficient functions, F1 and h1, which provide the necessary information for predicting the crack driving force in cracked elbows, for several elbow and crack geometry are tabulated. An evaluation about the ,J calculating method is carried out.