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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。主应变化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。
The effects of main strain ratio ε3 / ε1 = -0.8, -0.7, -0.6, -0.5 and equivalent strain amplitude 0.5%, 0.7%, 0.8 %, 0.9%, 1.0%, 1.1% of low-cycle multiaxial fatigue properties. The results show that the recrystallized Zr-4 alloy shows the characteristics of initial short-term hardening and subsequent softening during the pull-torsional load. The cyclic equivalent stress-strain curve of the Zr-4 alloy lies above the monotonous curve and shows cyclic hardening. The main changes should have no effect on the cyclic hardening curve. The same Mises equivalent strain amplitude, the greater the strain ratio, the lower the fatigue life. During biaxial fatigue, the Mises equivalent strain amplitude and the fatigue life of Zr-4 alloy are exponential.