Constitutive modelling of fibre-reinforced composites with unidirectional plies using a plasticity-based approach
Constitutive modelling of fibre-reinforced composites with unidirectional plies using a plasticity-based approach
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DOI：
10.1016/j.compscitech.2011.03.009
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发表时间：
2011-05-31
影响因子：
9.1
通讯作者：
Robinson, P.
中科院分区：
文献类型：
--
作者：
Vyas, G. M.;Pinho, S. T.;Robinson, P.
本文提出了一个本构模型的发展，能够准确地代表完整的非线性力学响应的聚合物基纤维增强复合材料的单向（UD）层在准静态载荷下。这是通过利用弹塑性建模框架来实现的。该模型捕捉了UD复合材料本构建模中经常被忽略的关键特征，例如静水压力对弹性和非弹性材料响应的影响，多轴加载的影响和屈服应力对施加压力的依赖性。本构模型包括一个新的屈服函数，它准确地代表了单向纤维内基体的屈服，通过消除对纤维方向上的应力的依赖性来增强复合材料。非关联流动规则用于捕获材料的压力敏感性。随后的屈服面的实验观察到的翻译建模使用非线性运动硬化规则。此外，演化规律提出的非线性硬化，涉及到所施加的静水压力。多轴试验数据表明，该模型能够预测在复杂的加载组合下的非线性响应，只有从两个单轴试验的实验响应。(C)2011爱思唯尔有限公司保留所有权利。
This paper presents the development of a constitutive model able to accurately represent the full non-linear mechanical response of polymer-matrix fibre-reinforced composites with unidirectional (UD) plies under quasi-static loading. This is achieved by utilising an elasto-plastic modelling framework. The model captures key features that are often neglected in constitutive modelling of UD composites, such as the effect of hydrostatic pressure on both the elastic and non-elastic material response, the effect of multiaxial loading and dependence of the yield stress on the applied pressure.The constitutive model includes a novel yield function which accurately represents the yielding of the matrix within a unidirectional fibre-reinforced composite by removing the dependence on the stress in the fibre direction. A non-associative flow rule is used to capture the pressure sensitivity of the material. The experimentally observed translation of subsequent yield surfaces is modelled using a non-linear kinematic hardening rule. Furthermore, evolution laws are proposed for the non-linear hardening that relate to the applied hydrostatic pressure.Multiaxial test data is used to show that the model is able to predict the non-linear response under complex loading combinations, given only the experimental response from two uniaxial tests. (C) 2011 Elsevier Ltd. All rights reserved.