不均等層を有する金属材料の繰返し曲げ変形と曲げ疲労に伴う残留応力変化

概要

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Laminated inhomogenity and residual stress are known to be important factors controlling fatigue of surface-hardened materials. This paper describes an analytical method by which the effects of laminated inhomogeneity and residual stress on cyclic bending deformation behavior can be discussed quantitatively. The analytical results where compared with the experimental results of the clad plates composed of low and medium carbon steels, which were used as a laminated inhomogeneous model. Also, the change of residual stress distribution due to bending fatigue was discussed quantitatively. The results obtained are as follows; (1) For the hysteresis loop and surface residual stress change in cyclic bending deformation, the analytical results agreed well with the measured results in S 0 C base and in clad plates. Also, this analysis enabled us to calculate the cyclic stress-strain relation throughout the thickness of plate subjected to bending fatigue. It was found that the initial residual stress had for stronger influence on the mean stress than the plastic strain amplitude in the calculated cyclic stress-strain relations. (2) It was found that this analysis could be applied for evaluation of residual stress distribution throughout the thickness of corburized plates subjected to bending fatigue.
社団法人日本材料学会の論文
1985-06-15