A Study on the Measurement of Stress Intensity Factor Considering of High Order of Stress Field in the Vicinity of Crack Tip by Photoelastic Experiment

광탄성 실험에서 균열선단 응력장의 고차항을 고려한 응력확대계수 측정에 관한 연구

Generally, photoelastic experimental data were measured in the closed vicinity of crack tip to determine stress intensity factors of a crack with photoelastic experiment method. In this case, only the first order term has been considered in the equation of stress field. But because it is very difficult to measure the correct photoelastic data in the closed vicinity of crack, the accuracy of experimental results was very poor. By including the high order terms in the stress field equation we could obtain the accurate S.I.F values by using clear photoelastic data in the distant region from crack tip instead of unclear photoelastic data in the vicinity of crack tip.