一种统一的多轴疲劳损伤参量

城分析多轴损伤临界面上的应变化特性的基础上，根据多轴疲劳临界损伤平面原理，提出利用多轴介面上的最大剪切应变幅与相临两个最大剪切应变值之间的法向应变幅所合成的ｖｏｎ Ｍｉｓｅｓ等效应变幅作为多轴疲劳损伤参量，该参量不含有任何材料常数，不仅能够适用于多轴比例与非比例加载下，而且可退化成单轴的形式，经四种材料的试验验证，结果是令人满意的。

A UNIFIED MULTIAXIAL FATIGUE DAMAGE PARAMETER

According to the critical plane principle, a unified multiaxial fatigue damage parameter is presented based on the varying behaviour of the strains on the critical plane. Both porameters of the maximum shear strain amplitude and normal strain excursion between adjacent turning points of the maximum shear strain on the critical plane are considered in the presented multiaxial fatigue damage parameter. An equivalent strain is made with both perameters of the maximun shear strain amplitude and normal strain excursion by means of von Mises criterion. Thus a new multiaxial fatigue damage model is given based on critical plane approach. The results show that the mulhaxial fatigue damagr parameter proposed in this paper may be used under either proportional or nonproportional loading, and may also be reduced to an uniaxial form. It is used to predict multiaxial fatigue life and good agreement is demonstrated by experimental data.