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聚合物基体的变形局部化在复合材料破坏过程中起着重要作用。采用有限元分析方法,借助用户材料子程序(UMAT),描述了具有应变软化特点的高聚物弹塑性的本构关系,研究了纤维/环氧树脂复合材料在拉伸破坏过程中基体局部变形的演化规律,分析了基体的局部应变软化对纤维/环氧树脂复合材料应力的影响。结果表明:纤维的应力分布及基体的塑性变形具有不均匀性;基体局部变形降低了邻近断点的完好纤维的应力集中程度;随着纤维间距的增加,邻近断点的完好纤维的应力集中区域变宽,而且应力集中程度降低。
Deformation localization of the polymer matrix plays an important role in the destruction of the composite material. The elasto-plastic constitutive relations of polymer with strain softening were described by means of finite element analysis and User Material Subroutine (UMAT). The local deformation of fiber / epoxy composite during tensile failure The influence of local strain softening on the stress of fiber / epoxy composites was analyzed. The results show that the stress distribution of the fiber and the plastic deformation of the substrate are inhomogeneous. The local deformation of the substrate reduces the stress concentration of the intact fiber adjacent to the breakpoint. As the fiber spacing increases, the stress concentration area of the intact fiber near the breakpoint Broaden, and reduce the degree of stress concentration.