ABSTRACT

This paper presents novel multi-scale modeling and failure analysis of hybrid carbon fiber reinforced polymer (CFRP) composites enhanced by zinc oxide (ZnO) nanowires. Vertically aligned ZnO nanowires on CFRP plies create enhancement layers, leading to the increased interfacial properties in composites. A multi-scale model bridging from micro-scale to macro-scale investigates the enhanced interlaminar shear properties in the hybrid composite. At the micro-scale, the effective material properties of the enhancement layer are extracted by the homogenization of an appropriate representative volume element. At the mesoscale, the cohesive zone model is employed to investigate the adhesion bonding and the delamination between the plies. At the macro-scale, the progressive intralaminar failure analysis is developed to explore damage initiation and evolution in fiber and matrix utilizing the user subroutine to define material behavior (VUMAT). Finite element analysis of a three-dimensional hybrid composite short beam under three-point bending (3PB) load is performed to extract the damage behavior. Numerical results demonstrate that interlaminar shear strength of the hybrid CFRP composites is improved by 43% under 3PB load. The effect of diameter and length of ZnO nanowires on the shear strength of the hybrid laminated structure is discussed.

摘要

本文介绍了氧化锌 (ZnO) 纳米线增强的混合碳纤维增强聚合物 (CFRP) 复合材料的新型多尺度建模和失效分析。CFRP 层上垂直排列的 ZnO 纳米线形成增强层，从而提高复合材料的界面性能。从微观尺度到宏观尺度的多尺度模型研究了混合复合材料中增强的层间剪切性能。在微观尺度上，增强层的有效材料特性是通过适当的代表性体积元素的均匀化来提取的。在中尺度上，内聚区模型用于研究层间的粘合和分层。在宏观层面，渐进式层内失效分析旨在利用用户子程序定义材料行为 (VUMAT) 来探索纤维和基体中的损伤起始和演变。对三点弯曲 (3PB) 载荷下的三维混合复合短梁进行有限元分析，以提取损坏行为。数值结果表明，在3PB载荷下，混合CFRP复合材料的层间剪切强度提高了43%。讨论了ZnO纳米线的直径和长度对混合层状结构剪切强度的影响。数值结果表明，在3PB载荷下，混合CFRP复合材料的层间剪切强度提高了43%。讨论了ZnO纳米线的直径和长度对混合层状结构剪切强度的影响。数值结果表明，在3PB载荷下，混合CFRP复合材料的层间剪切强度提高了43%。讨论了ZnO纳米线的直径和长度对混合层状结构剪切强度的影响。