以分段线弹性方法考虑了单向复合材料纵向、横向与剪切的非线性特性,建立了静拉伸热塑性PE/PE层合板逐渐损伤模型,利用有限元技术模拟研究了UHMWPE/LDPE层合板逐渐损伤的过程及机理.研究表明,纵向非线性对层合板的拉伸力学行为非线性有显著影响;各向非线性的分段线弹性处理可简便有效地分析复合材料及其结构的非线性问题,结合逐渐损伤分析可清楚揭示基体开裂、纤一基剪切和纤维断裂等损伤模式及其进程.算例分析的理想结果验证了模型的有效性.
A progressive damage model has been developed for thermoplastic PE/PE laminates subjec-ted to static tensile loading, by considering the nonlinear properties of unidirectional composites in longitudinal, transverse and shear stress-strain behavior as piecewise linear-elastic properties. Finite element method was used for simulating the progressive failure of UHMWPE/LDPE laminates to study the damage mechanisms. It was showed that longitudinal nonlinearity of the composites bad re-markable effect on the nonlinear behavior of the laminates. The nonlinearity of composites and struc-tures was conveniently and effectively included by the piecewise linear elasticity treatment. Combining with the progressive failure analysis, damage modes such as matrix cracking, fiber-matrix shearing and fiber fracture were revealed and the damage propagation was presented. The analytical prediction showed excellent agreement with the experimental data, proving that the numerical modeling is valid.
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