一种统一的多轴疲劳损伤参量  

A UNIFIED MULTIAXIAL FATIGUE DAMAGE PARAMETER

作　　者：尚德广[1] 姚卫星[1] 王德俊[2] 徐灏[2] 平安[2] 

机构地区：[1]南京航空航天大学飞行器系,南京210016 [2]东北大学机械工程学院,沈阳110006

出　　处：《固体力学学报》1999年第3期201-210,共10页Chinese Journal of Solid Mechanics

基　　金：高等学校博士学科点基金!9414501;航空高等院校自选科研基金;航空科学基金!98B52011;国家自然科学基金!59575027;59775030

摘　　要：在分析多轴损伤临界面上的应变变化特性的基础上，根据多轴疲劳临界损伤平面原理，提出利用多轴临界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vonMises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，不仅同时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．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.

关 键 词：多轴疲劳 临界损伤平面 比例 非比例 寿命 加载 

分 类 号：O346.2[理学—固体力学]