2309 チタン合金材の低サイクル疲労挙動(S07-2 非鉄材料の疲労特性,S07 構造材料の疲労強度とき裂進展問題)

概要

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This paper describes the low cycle fatigue behavior and mean stress effect of Ti-6Al-4V alloy that is commonly used in aerospace and other industries due to their excellent specific strength, heat resistance, etc. Strain controlled fatigue tests for 10^3〜10^4 cycles, low cycle fatigue region, and load controlled tests for longer than 10^4 cycles have been carried out. Cyclic stress-strain response based on hysteresis loop peaks at 10 cycles and half life indicated cyclic softening. Minimum stress relaxation was affected by compressive yield stress. Comparing the S-N data obtained strain controlled fatigue tests and load controlled tests, the effect on mean stress was investigated. This mean stress effect can be estimated by using Walker stress.
一般社団法人日本機械学会の論文
2007-09-07