無限体中に存在する円周き裂を有する軸対称空かのK_I

抄録

Recently one of the authors has proposed a method for the analysis of stress intensity factor which uses the crack tip stress calculated by FEM. It is called the crack tip stress method. In this paper, the crack tip stress method is applied to the K_I analysis of an infinite body subjected to tension, which has an axisymmetrical ellipsoidal cavity or a disk-type cavity with a circumferential crack. The values of K_I are discussed based on the effective crack size (a+λ), where a is the radius of ellipsoid or disk and λ is the size of crack emanating from the notch root. Furthermore, based on the linear notch mechanics it is shown that the relation between F_I = K_I/(1.121 5σ_max √(π)λ) and λ/ρ is almost independent of ρ/a, where ρ is the notch root radius and σ_max is the maximum stress at the notch root when the crack dose not exist.