Damage accumulation in a carbon/epoxy composite: Comparison between a multiscale model and computed tomography experimental results
Damage accumulation in a carbon/epoxy composite: Comparison between a multiscale model and computed tomography experimental results
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DOI：
10.1016/j.compositesa.2012.03.011
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发表时间：
2012-09-01
影响因子：
8.7
通讯作者：
Bunsell, A. R.
中科院分区：
文献类型：
--
作者：
Scott, A. E.;Sinclair, I.;Bunsell, A. R.
高分辨率的计算机断层扫描已进行了碳/环氧树脂层压板现场加载失败。实验数据可以在三维空间中以一种明确的、具有力学代表性的方式量化主要的损伤机制，而以往的实验分析是有限的。将预测拉伸载荷下复合材料损伤累积的多尺度模型与实验分析进行比较，以验证模型中的基础假设和整体性能。该模型考虑了纤维强度的随机性、纤维断裂引起的应力传递、纤维/基体脱粘和基体的粘度。在模型中的假设，以减少计算时间，同时考虑到整个结构的微观behavior.Both模型和实验结果表明，失败的复合材料的进展，通过单纤维断裂，其中，在较高的负载，演变成集群的断裂纤维。该模型对结构的前期损伤累积和最终破坏荷载进行了合理的预测。(C)2012爱思唯尔有限公司保留所有权利。
High-resolution computed tomography has been carried out for carbon/epoxy laminates loaded in situ to failure. The experimental data allows major damage mechanisms to be quantified in 3D, in an unambiguous and mechanically representative way, where previous experimental analysis is limited.A multi-scale model that predicts damage accumulation in tensile loaded composites is compared to the experimental analysis, to validate the underpinning assumptions within the model and overall performance. The model considers the random nature of fibre-strengths, stress transfer resulting from fibre breaks, fibre/matrix debonding and viscosity of the matrix. Assumptions within the model are made to reduce computational times whilst considering the microscopic behaviour of the whole structure.Both model and experimental results indicate failure of the composite progresses via single fibre breaks, which, at higher loads, evolve into clusters of broken fibres. The model resulted in reasonable predictions of the preceding damage accumulation and final failure load of the structure. (C) 2012 Elsevier Ltd. All rights reserved.