弾塑性解析に基づく切欠き平板の疲労寿命推定 : K_σとK_εの関係およびS15C材のき裂発生寿命

概要

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In order to estimate the crack initiation life of notched specimen, it is necessary to obtain the stress or strain at the notch root. For this purpose, Neuber's equation and Stowell's equation have been proposed, but the measured strain at the notch root does not always correspond to the strain calculated with these equations. So, some elasto-plastic analysis by FEM on side notched plates were carried out by using various stress-strain relations, and a new empirical equation which can well represent these calculation results is proposed as follows. (K_t - 1)/(K_σ- 1) - I =2.4{K_ε- l)/(K_t - 1) - 1} here K_t, K_σ and K_ε are the elastic stress concentration factor, the plastic stress concentration actor and the plastic strain concentration factor, respectively. Besides, it was shown that the fatigue test results for S15C steel were in good agreement with the fatigue life estimated with this equation.
社団法人日本材料学会の論文
1978-09-15