1132 非比例多軸負荷におけるTi-6Al-4Vの低サイクル疲労寿命に及ぼす平均ひずみの影響(OS11-8 材料の疲労挙動と損傷評価-多軸,ねじり,切欠き-)

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Mean strain effect on multiaxial low cycle fatigue behavior of Ti-6A1-4V was investigated. Strain controlled multiaxial fatigue tests at room temperature were carried out under uniaxial and non-proportional loadings using tubular specimen. The strain paths employed were three types of proportional and two types of non-proportional loadings. In data correlation by Mises' equivalent strain range, failure lives in multiaxial low cycle fatigue under non-proportional loading are affected by not only strain non-proportionality but also mean stress and strain. This study discusses the fatigue life properties based on the obtained test results and also shows strain parameters for the life evaluation under non-proportional loading with mean strain.
2010-10-09