Abstract
The problem of stress intensity factor of penny-shaped crack with imperfect crack tip shape for a tensile loading is formulated based an energy principle perturbed when crack tip is changed from a complete circle line. In this study, the perturbed crack line α-ε(1+cosmθ), which is variation of circle with radius a, was assumed inside an infinite elastic media subjected to uniform tensile stress. Approximated stress intensity factor solution associated with penny-shaped crack with imperfect crack tip was obtained by general perturbation scheme under small amount of ε. It was shown that the approximated solution matched with the results of three dimensional finite element analysis, consequently.
