OS0740 非比例多軸負荷におけるTi-6Al-4Vの低サイクル疲労寿命(構造用材料の疲労挙動と寿命評価,オーガナイズドセッション)

概要

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This study discusses multiaxial low cycle fatigue (LCF) life of Ti-6Al-4V alloy under proportional and non-proportional loadings at room temperature. Strain controlled multiaxial LCF tests carried out using Ti-6Al-4V hollow cylinder specimens. The strain paths employed were proportional and non-proportional loadings. The former was a push-pull straining. The latter is a circular straining where axial and shear strains have 90 degree out-of-phase difference. Shape and dimensions of specimen employed was a hollow cylinder with O,D,11mm, I.D.9mm and GL.7mm. The reduction of LCF life due to non-proportional loading was discussed relating to cyclic deformation behavior. Fatigue lives decreased down to 1/10 by the non-proportional loading depending on strain path for Ti-6Al-4V, whereas the degree of additional hardening was different, which suggested that another factor like difference of crystal structure should be taken into account for the life prediction under non-proportional loading.
一般社団法人日本機械学会の論文
2009-07-24