Numerical Analysis Methods of Surface Cracks

摘要

The present work concentrates on developing methods for practical engineering fracture and fatigue analysis of flawed thick-walled components. The major contributions to the present state of the art are: (1) the method developed for approximating weight functions for 3D surface flaws and (2) the use of an accuracy indicator together with localized model refinement for systematic improvement of the accuracy of the FE analysis results. Other important components of the work are the automated capability of generating FE models developed for practically any flawed components and a weight function-based program for practical engineering fracture and fatigue analysis. The ACR (Automatic Finite Element Model Generation for Part Through Cracks) program was developed for modeling a surface crack in a structure with a 3D FE model. The accuracy of the methods and applicability of the system developed to practical engineering problems was demonstrated by several examples.