Improvement of Extrapolation Method on Stress Intensity Factor

Abstract

In this study, errors of stress intensity factor K_I by stress extrapolation method, displacement extrapolation method and hybrid extrapolation method were investigated on a crack in infinite plate problem. It is found that the errors of stress and strain near crack tip are almost expressed as a simple equation, and we propose the modified distance extrapolation method which assures the high accuracy of K_I by finite element analysis. The usefulness of this method is shown by the results of K_I calculation on two- and three-dimensional crack problems.