一、前言在工程结构中,许多材料的受力状态并不是单一的,往往是多轴应力复合作用,而且应力的形式也可能不一样。常规的单轴应力力学性能试验,或几个单一参数的累加,并不能正确反映材料在复合应力作用下的性能。因此,随着科学技术的发展,研究材料 I. INTRODUCTION In the engineering structure, the stress state of many materials is not single, often multi-axial stress composite effect, and the form of stress may not be the same. Conventional uniaxial stress mechanical test, or the accumulation of a few single parameters, and can not correctly reflect the material under composite stress performance. Therefore, with the development of science and technology, research materials