Negative through-the-thickness Poisson’s ratio of elastic–viscoplastic angle-ply carbon fiber-reinforced plastic laminates: Homogenization analysis
Negative through-the-thickness Poisson’s ratio of elastic–viscoplastic angle-ply carbon fiber-reinforced plastic laminates: Homogenization analysis
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DOI：
10.1016/j.ijplas.2014.05.007
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发表时间：
2014-12
影响因子：
9.8
通讯作者：
T. Matsuda;K. Goto;N. Kubota;N. Ohno
中科院分区：
文献类型：
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作者：
T. Matsuda;K. Goto;N. Kubota;N. Ohno
从宏观和微观两个方面研究了碳纤维增强塑料（CFRP）角铺设层合板的弹粘塑性行为中的负泊松比。为此，提出了一种基于均匀化理论的分析方法，用于分析具有点对称内部结构的非线性时变复合材料。该方法能够有效地分析由纤维和基体组成的微结构完全建模的角铺设CFRP层合板的宏观和微观弹粘塑性性能。使用所提出的方法，角铺设碳纤维/环氧树脂层合板与各种层合板配置的弹粘塑性分析进行调查，在粘塑性区域的泊松比。据透露，对于一系列的层压板配置，通过厚度泊松比表现出负值，变得越来越负的粘塑性变形的进展，在层压板。应变率对这种增加的负性的影响也被证明，并研究微观机制来解释这一趋势。它进一步表明，增加负显着影响微观层间应力分布。
Negative through-the-thickness Poisson’s ratios are investigated macroscopically and microscopically in the elastic–viscoplastic behavior of angle-ply carbon fiber-reinforced plastic (CFRP) laminates. For this purpose, an analysis method is proposed based on a homogenization theory for nonlinear time-dependent composites with point-symmetric internal structures. This method is able to efficiently analyze both the macroscopic and microscopic elastic–viscoplastic properties of angle-ply CFRP laminates fully modeled with microstructures consisting of fibers and a matrix. Using the proposed method, the elastic–viscoplastic analysis of angle-ply carbon fiber/epoxy laminates with various laminate configurations is performed to investigate their Poisson’s ratios in the viscoplastic region. It is revealed that, for a range of laminate configurations, the through-the-thickness Poisson’s ratios exhibit negative values which become increasingly negative as the viscoplastic deformation progresses in the laminates. The effect of strain rate on this increasing negativity is also demonstrated, and microscopic mechanisms are investigated to explain this trend. It is further shown that the increasing negativity significantly affects microscopic interlaminar stress distributions.