一、前言 拉伸力学特性是反映材料性质的一项重要力学指标。目前,对于可产生大变形的高分子材料如纺织品、橡胶、塑料、纸张等的拉伸力学特性试验,都是以单向拉伸试验机来进行,但就实际使用状态来看,这些材料一般是同时受到多方向的拉伸而变形的,尤其以受双轴向拉伸变形最 First, the preface Tensile mechanical properties is an important mechanical indicator of the nature of the material. At present, tensile mechanical properties tests on macromolecule materials such as textiles, rubbers, plastics, paper and the like which can produce large deformations are conducted by means of a uniaxial tensile testing machine. However, in view of practical use, these materials are generally At the same time by the multi-directional stretching and deformation, especially in biaxial stretching deformation most