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基体局部软化对纤维/环氧树脂复合材料力学行为影响的数值分析

, PP. 215-221

Keywords: 复合材料,基体软化,应力集中,数值分析,细观力学

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Abstract:

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。

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