The Influence of Nonsingular Stresses on Experimental Measurements of the Stress Intensity Factor

摘要: It is well established that, within the framework of linear elastic fracture mechanics, state stress in immediate vicinity a crack tip under opening-mode loading can be represented by modified near-field equations: $$ \sigma_x = \frac{K}{\sqrt{2\pi}r}\ cos\ \frac{\theta}{2} \ (1 - sin\ \frac{\theta}{2}\ sin \frac{3\theta}{2})\ + \sigma_ox $$ , \sigma_y (1\ \frac{3\theta}{2}) {\tau _{xy}} \frac{K}{{\sqrt {2\pi } r}}\;cos\;\frac{\theta }{2}\;sin\;\frac{\theta }{2}\;cos\;\frac{{3\theta }}{2} $$ .