Boundary element methods for the analysis of crack growth in the presence of residual stress fields

摘要

Two boundary element methods of simulating crack growth in the presence of residual stress fields are presented, and the results are compared to experimental measurements. The first method utilizes linear elastic fracture mechanics (LEFM) andsuperimposes the solutions due to the applied load and the residual stress field. In this method, the residual stress fields are obtained from an elastoplastic BEM analysis, and numerical weight functions are used to obtain the stress intensity factorsdue to the fatigue loading. The second method presented is an elastoplastic fracture mechanics (EPFM) approach for crack growth simulation. A nonlinear J-integral is used in the fatigue life calculations. The methods are shown to agree well withexperimental measurements of crack growth in prestressed open hole specimens. Results are ElIso presented for the case where the prestress is applied to specimens that have been precracked.