ORTHOTROPIC BEHAVIOR AND STRENGTH CRITERION OF PES/PVC MEMBRANE MATERIALS UNDER TENSILE LOADING
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摘要: 以PES/PVC膜材料单轴向拉伸试验为研究基础,对膜材料的0°、15°、30°、45°、60°、75°和90°七个面内方向上的拉伸试验特征进行了分析,证明了采用三次加载后的应力-应变曲线可以用来描述膜材料的弹性力学性质,且测得的膜材料弹性常数符合正交各向异性本构关系。为获得膜材料在复杂应力状态下的断裂强度,对膜材料拉伸断裂破坏的机理及适用的相关强度准则进行了讨论。结果表明,利用Tsai-Hill强度准则能对纯拉或纯剪切型破坏模式下的膜材料断裂强度做出较好的预测,但该准则不适合对拉剪混合型破坏模式下膜材料断裂强度的预测。Abstract: Based on uni-axial tensile testing experiments of PES/PVC membrane materials, tensile performances of the samples were analyzed in seven in-plane directions including 0°, 15°, 30°, 45°, 60°, 75° and 90°. It is disco-vered that the stress-strain behaviors of the samples can correctly represent the elastic properties of the membrane material after three cycles of tensile loading and unloading. The results show that the elastic performance of the materials can be described by the constitutive relations of the orthotropic materials. In order to predict the tensile strength of the membrane materials under the conditions of complicated stress, the rupture mechanisms of the materials and the corresponding strength criterion were discussed. The analytical results indicate that Tsai-Hill criterion is applicable under the pure tensile or pure shear mode. However, it is less suitable under the tensile-shear mixture mode.
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