鉄膜材における疲労き裂伝ぱ特性と圧延組織の相関

概要

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A new film fatigue testing method was proposed by which fatigue cracks can be initiated and propagated in a film adhered to cover an elliptical through-hole in a base plate subjected to push-pull cyclic loads. Using this method, in order to discuss the effect of rolling texture on fatigue crack propagation properties of commercially-pure iron films with the thickness of 100 μm, the films were annealed at 873 K, 1 073 K and 1 173 K after rolling, and the two types of specimen whose rolling direction was either parallel or perpendicular to loading direction were fatigued. The crystallographic characteristics of rolling textures in annealed iron films was analyzed using EBSD (Electron Backscatter Diffraction) system. As a result, the anisotropy of rolling texture remained after annealing, and there was a difference between the two types of specimen in crack morphology on the specimen surface. When compared at the same stress intensity factor range, ΔK_<est>, evaluated from the crack opening displacement, fatigue cracks in the film loaded to the perpendicular direction to the rolling direction propagate faster than that in the film loaded to the parallel direction. The reason was probably that the slip plane of the rolling texture in iron film materials is different in accordance with the relationship between rolling direction and crack propagation direction.
一般社団法人日本機械学会の論文
2001-04-25