弾塑性応力解析に基づく予引張負荷を受けた鋼切欠材の表面疲労き裂進展挙動の検討

概要

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A stress raiser such as notches, holes and structural discontinuity is commonly contained in machine components, which reduces the fatigue life time. The extension of the fatigue life time is quite significant problem in notched components from the viewpoint of engineering. The pre-tensile loading has been extensively known as one of useful means for improving fatigue strength. The fatigue tests, however, showed that pre-tensile loading hardly influenced the fatigue crack growth rate in the notched cylindrical specimen. The stress/strain analysis was conducted for the notched cylindrical component using the elastic-plastic finite element method, where cyclic softening and variation of mean strain were taken into account. The stress/strain analysis showed that compressive residual stress attenuated around the notch root in the fatigue process. Almost no influence of pre-tensile loading on fatigue crack growth seems to be induced by such a redistribution of residual stress occurring during cyclic loading.
一般社団法人日本機械学会の論文
1998-07-25