Out-of-plane bending stress intensity factor analysis of crack in a strip using single-element strain gage

Abstract

In recent years, the authors have succeeded in obtaining a strain gage dedicated to stress intensity factor analysis (hereinafter referred to as K-value gage) with a single element with an error rate of ± 5% from the theoretical value. In this study, an experimental analysis of the out-of-plane bending stress intensity factor of a strip crack was attempted using this single-element K-value gage. The stress intensity factor analytical formula for cracks subjected to out-of-plane bending was derived by M. L. Williams, and the bending of plate materials was further developed and reported by G. C. Sih et al.. The stress formula derived by M. L. Williams was used as the out-of-plane bending stress analysis formula for cracks at the starting point of this study. This stress equation was converted into a strain equation to derive the K-value gage equation.