Comparative Research on Calculation Methods of Stress Intensity Factors and Crack Propagation Criterion

摘要

In order to compare the calculation methods of stress intensity factors and crack propagation criterion, and to find the best method to calculate stress intensity factors and crack propagation criterion. The FRANC3D software was used to calculate and analyze the specimen with a center crack, the specimen with a single side crack, the specimen with bilateral cracks and the cylindrical specimen with a deep buried elliptical crack. The calculation methods of three stress intensity factors including displacement correlation method, virtual crack closure integral method, and M-Integral method were compared. The relative advantages and disadvantages of two crack propagation criterions including maximum circumferential stress criterion and maximum strain energy release rate criterion were studied. The results show that in the calculation methods of three stress intensity factors, the accuracy of the M-Integral method and the virtual crack closure integral method is better, and the displacement correlation method is poorer. Between the two criterions of crack propagation, maximum circumferential stress criterion is superior to maximum strain energy release rate criterion.