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Characterisation of mechanical behaviour and damage analysis of 2D woven composites under bending

机译：二维编织复合材料弯曲时的力学行为表征和损伤分析

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摘要

In this paper, flexural loading of woven carbon fabric-reinforced polymer laminates is studied using a combination of experimental material characterisation, microscopic damage analysis and numerical simulations. Mechanical behaviour of these materials was quantified by carrying out tensile and large-deflection bending tests. A substantial difference was found between the materials' tensile and flexural properties due to a size effect and stress stiffening of thin laminates. A digital image-correlation technique capable of full-field strain-measurement was used to determine in-plane shear properties of the studied materials. Optical microscopy and micro-computed tomography were employed to investigate deformation and damage mechanisms in the specimens fractured in bending. Various damage modes such as matrix cracking, delaminations, tow debonding and fibre fracture were observed in these microstructural studies. A two-dimensional finite-element (FE) model was developed to analyse the onset and propagation of inter-ply delamination and intra-ply fabric fracture as well as their coupling in the fractured specimen. The developed FE model provided a correct prediction of the material's flexural response and successfully simulated the sequence and interaction of damage modes observed experimentally. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在本文中，结合了实验材料的表征，微观损伤分析和数值模拟，研究了机织碳纤维增强聚合物层压板的弯曲载荷。这些材料的机械性能通过进行拉伸和大挠曲弯曲试验来量化。由于尺寸效应和薄层压板的应力硬化，在材料的拉伸和弯曲性能之间发现了很大的差异。使用能够进行全场应变测量的数字图像相关技术确定所研究材料的面内剪切特性。利用光学显微镜和计算机断层扫描技术研究弯曲断裂试样的变形和损伤机理。在这些微观结构研究中，观察到各种破坏模式，例如基体开裂，分层，丝束剥离和纤维断裂。建立了二维有限元（FE）模型，以分析层间分层和层内织物断裂的发生，传播以及在断裂试样中的耦合。开发的有限元模型提供了材料弯曲响应的正确预测，并成功模拟了实验观察到的损伤模式的顺序和相互作用。 （C）2015 Elsevier Ltd.保留所有权利。

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