Computational implementation of a novel constitutive model for multidirectional composites
Computational implementation of a novel constitutive model for multidirectional composites
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新型多向复合材料本构模型的计算实现
DOI：
10.1016/j.commatsci.2011.07.038
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发表时间：
2012
影响因子：
3.3
通讯作者：
Vyas G
中科院分区：
文献类型：
--
作者：
Vyas G
本文详细介绍了单向（UD）聚合物基纤维增强复合材料，这是能够准确地表示完整的非线性力学响应的本构模型的数值实现。特征，如静水压力的敏感性，多轴加载的效果和屈服应力对所施加的压力的依赖性往往被忽略的本构建模，但包括在这个模型中。本构模型包括一个新的屈服函数，非关联流动规则和非线性随动硬化规则。它与适当的破坏准则和相关的损伤模型相结合。完整的模型是在一个显式的有限元代码。实验测试数据表明，该模型能够预测单向和多向复合材料层合板的非线性响应。该模型被证明可以准确地预测复杂的多轴加载和卸载下的本构响应，包括显着的静水压力。预测也示出比较有利的演变后，初始基体开裂检测到的故障标准的基体开裂。
This paper details the numerical implementation of a constitutive model for unidirectional (UD) polymer-matrix fibre-reinforced composites, which is able to accurately represent the full non-linear mechanical response. Features such as hydrostatic pressure sensitivity, the effect of multiaxial loading and the dependence of the yield stress on the applied pressure are often neglected in constitutive modelling, but are included in this model. The constitutive model includes a novel yield function, non-associative flow rule and a non-linear kinematic hardening rule. It is combined with suitable failure criteria and associated damage model. The complete model is implemented in an explicit finite element code. Experimental test data is used to show that the model is able to predict the non-linear response of both unidirectional and multidirectional composite laminates. The model is shown to accurately predict the constitutive response under complex multiaxial loading and unloading, including significant hydrostatic pressure. Predictions are also shown to compare favourably for the evolution of matrix cracking after initial matrix cracking is detected by the failure criteria.
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