アルミニウムの疲労き裂先端の塑性ひずみ分布

概要

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In order to clarify the mechanism of fatigue crack propagation, the plastically deformed zones at the crack tips were measured by means of two microbeam X-ray diffraction techniques: The transmission Laue method and the back reflection Debye-Scherrer method. The material used was annealed, extremely pure aluminum of 99.999%, and the specimens were subjected to cyclic tension and compression loads. The distribution of maximum shear stress, τ_<max>, around the crack tip was estimated by Sneddon's formula. It was found that the plastically deformed zones appear in accord with theτ_<max> distribution; that is, the minimum deformed region exists at the front of the crack tip and the maximum one appears in the direction 40°〜50° off from the crack propagating direction. I was also clarified that the total misorientation of the grain near the crack tip inside of the specimen is slightly larger than on the surface.
社団法人日本材料学会の論文
1974-01-15