研究了不同主应变比比例加载和不同相位角非比例加载条件下Zr-4合金双轴疲劳行为.结果表明:双轴比例和非比例循环变形过程中,在Mises循环等效应力响应-循环周次曲线上,Zr-4均表现为循环初始硬化,随后逐渐软化特征.Mises循环等效应力-应变曲线均位于单调曲线的上方,表现为循环硬化特征.进一步研究表明:非比例加载过程中合金的循环强化程度高于相同等效应变下的比例加载,表现为非比例附加强化现象.当主应变比为-0.64,相位角为90°时,非比例附加强化程度最高.比例加载过程中,随着主应变比提高,疲劳寿命降低.非比例加载下合金的疲劳寿命低于相同等效应变幅下的比例加载.非比例附加强化程度越高,双轴疲劳寿命越低.
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