層状不均質金属材料の曲げ疲労強度と疲労き裂伝ぱ則の相関

概要

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An expression for evaluation of fatigue life was proposed on the basis of fatigue crack growth law, confirming the fact that tensile mean stress and tensile residual stress did not influence the fatigue crack initiation life but has effects of acceleration for the fatigue crack growth. By using this expression,bending S-N curves for base metals and laminated inhomogeneous plates were discussed. As a result, a constant m of fatigue crack growth law in which the growth rate was proportional to the mth power of stress level and a ratio of crack intiation life to fatigue life were estimated for surface microcracks of base metals subjected to bending fatigue. In addition, especially in laminated inhomogeneous plates, tensile mean stress was found to decrease fatigue life remarkably because fatigue crack growth comprised a significant portion of fatigue lifetime.
社団法人日本機械学会の論文
1985-04-25