無限体中に存在する円周き裂を有する軸対称空かのＫＩ

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  • KI of the Axisymmetrical Cavity with a Circumferential Crack in an Infinite Body
  • ムゲンタイ チュウ ニ ソンザイ スル エンシュウ キレツ オ ユウスル ジク タイショウ クウカ ノ K1

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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 KI 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 KI 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 FI = KI/(1.121 5σmax √(π)λ) and λ/ρ is almost independent of ρ/a, where ρ is the notch root radius and σmax is the maximum stress at the notch root when the crack dose not exist.

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