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测定了拉－扭复合加载下，主应变比Ф＝－０．５，－０．６３，－０．７，－０．８和等效应变幅面。０．５％，０．７％，０．８％，１．０％，１．１％下，Ｚｒ—４低周疲劳寿命曲线．分别采用最大主应力、应变，ＣＯＤ应力、应变，最大剪应力、应变，Ｍｉｓｅｓ等效应力、应变，ＬＥ应变，ＢＭＫ应变准则，估算了Ｚｒ—４单轴、双轴低周疲劳寿命结果表明：应变准则能较好地描述Ｚｒ—４双轴低周疲劳寿命，特别是Ｍｉｓｅｓ等效应变、最大主应变、最大剪应变所估算的双轴试验数据基本上均匀分布在单轴数据曲线两倍分散带之内；而应力准则所估算的双轴试验数据均偏向单轴数据曲线的上方，说明应力准则不适用．
The main strain ratio Ф = -0.5, -0.63, -0.7, -0.8 and the equivalent strain amplitude were measured under tensile-torsional loading. 0.5%, 0.7%, 0.8%, 1.0%, 1.1%, Zr-4 low cycle fatigue life curve. The uniaxial and biaxial low cycle fatigue life of Zr-4 was estimated using the maximum principal stress, strain, COD stress, strain, maximum shear stress, strain, Mises equivalent stress, strain, LE strain and BMK strain. The strain criterion can well describe the biaxial low-cycle fatigue life of Zr-4, especially the Mises equivalent strain, the maximum principal strain and the maximum shear strain. The biaxial test data are basically evenly distributed in the double dispersion of the uniaxial data curve Band; however, the biaxial test data estimated by the stress criterion are biased to the top of the uniaxial data curve, indicating that the stress criterion is not applicable.