1999 Volume 42 Issue 4 Pages 472-478
Extending the engineering approach for elastic-plastic fracture analysis(EPRI approach)to creep crack analysis, in this study we examine an engineering approach for estimating the displacement, crack-tip J and C integrals under nonsteady creep conditions. On the bases of the proposed engineering approach and the elastic-plastic line-spring method, a creep line-spring method is proposed and the fundamental equations are established. The creep line-spring method is used for estimating the creep fracture parameters for three-dimensional creep cracks. In order to check its accuracy, several surface-cracked plates under uniform tension are analyzed by the creep line-spring method and the three-dimensional finite-element method. The numerical results show that the creep line-spring method is in good agreement with the finite-element method and has the same accuracy as the common elastic-plastic line-spring method.