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本文用中碳钢单轴加载条件下获得的低周疲劳性能试验数据,估计双轴加载时的破坏寿命。基于能量条件的八面体剪应变判据,把双轴加载的危害程度用一个系数kg表示。kg是一个与材料种类、主应变比值以及双轴应变相位有关的系数。对于中碳钢,两轴应变为同相(即同时为拉或同时为压)时,kg=e~(2.77)(9/(4+9));两轴应变为异相(一为拉和一为压)时,kg=e~(0.135)(9/(2+9))。式中9为塑性主应变e_1与e_2的比值,
In this paper, low-cycle fatigue performance test data obtained under uniaxial carbon steel loading conditions are used to estimate the failure life under biaxial loading. Based on the energy criterion of octahedral shear strain criterion, the hazard degree of biaxial loading is expressed as a coefficient kg. kg is a coefficient related to the type of material, the ratio of the main strain and the phase of the biaxial strain. For medium-carbon steels, the two-axis strain is in-phase (ie, simultaneous or simultaneous) and kg = e ~ (2.77) (9 / (4 + 9) One is pressure), kg = e ~ (0.135) (9 / (2 + 9)). Wherein 9 is the ratio of plastic main strain e_1 and e_2,