疲労き裂伝ぱ寿命推定のための初期残留応力分布同定に対する逆問題的取扱い

概要

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The present authors proposed two schemes for predicting the fatigue lives of cracks propagating in residual stress fields using initial residual stress distribution. To make applications of the schemes possible for cases where residual stresses redistributed due to crack initiation and propagation are given, this paper presents a method for determining initial residual stress fields form redistributed residual stresses measured at several points. Determination of the initial residual stress distribution was effectively achieved by introducing fundamental residual stress distribution functions which satisfied physical requirements for the residual stress. The least residual criterion was used in the determination. A sensitivity matrix was proposed to evaluate the effect of errors involved in the measurements and to select the best combination of measuring points. Numerical simulations of the determination on initial residual stress fields and the prediction of fatigue crack propagation lives showed the usefulness of the proposed method.
1988-05-25