研究了Zr-4合金管材在主应变比ε3/ε1=-0.8,-0.7,-0.6,-0.5和等效应变幅0.5%,0.7%,0.8%,0.9%,1.0%,1.1%下的低周多轴疲劳性能.结果表明:在拉-扭比例加载过程中,再结晶状态Zr-4合金表现为初期短暂硬化,随后持续软化的特性.Zr-4合金的循环等效应力-应变曲线位于单调曲线的上方,表现为循环硬化.主应变比对循环硬化曲线没有影响.相同Mises等效应变幅下,应变比越大,疲劳寿命越低.双轴疲劳过程中,Zr-4合金Mises等效应变幅与疲劳寿命之间呈指数关系.
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