The present article provides a review on the nonlinear mechanical behavior of polymer matrix composites (PMCs). Initially, essential mechanisms driving the nonlinear response of PMCs under different loading conditions are discussed. Rate-dependence, tension-compression asymmetry, viscous behavior, unloading characteristics, interaction between stress components and effects of environmental factors on mechanical properties are briefly reviewed. This is followed by a review of major approaches and constitutive models for predicting stress–strain behavior of PMCs. Following an increasing degree of complexity, models are categorized into four major classes: nonlinear elasticity models, elastic-plastic models, elastic-plastic-viscous models and Damage-Plasticity models. The vast number of existing models is mainly due to the anisotropy and inhomogeneity of PMCs. In brief, this review focuses on informing the reader of major frameworks, rather than addressing all the models in detail.

中文翻译：

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聚合物基复合材料的非线性力学响应：综述

本文提供了对聚合物基复合材料（PMCs）的非线性力学行为的审查。最初，讨论了在不同负载条件下驱动PMC非线性响应的基本机制。简要回顾了速率相关性，拉压压缩不对称性，粘性行为，卸载特性，应力分量之间的相互作用以及环境因素对机械性能的影响。接下来是对预测PMC应力-应变行为的主要方法和本构模型的综述。随着复杂度的提高，模型分为四大类：非线性弹性模型，弹塑性模型，弹塑性粘稠模型和损伤​​塑性模型。现有模型的数量众多主要是由于PMC的各向异性和不均匀性。简而言之，本文的重点是向读者介绍主要框架，而不是详细介绍所有模型。