An analytical model for the translaminar fracture toughness of fibre composites with stochastic quasi-fractal fracture surfaces
An analytical model for the translaminar fracture toughness of fibre composites with stochastic quasi-fractal fracture surfaces
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DOI：
10.1016/j.jmps.2014.02.001
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发表时间：
2014-05-01
影响因子：
5.3
通讯作者：
Pinho, Silvestre T.
中科院分区：
文献类型：
--
作者：
Pimenta, Soraia;Pinho, Silvestre T.
纤维增强复合材料的跨层断裂韧性是一个尺寸依赖性的性质，它决定着这些材料的损伤容限和失效。本文介绍了一个原始的分析模型的开发，实施和验证，以预测复合材料层片和束的拉伸跨层（纤维为主）韧性，以及相关的尺寸效应。该模型认为，作为能量耗散机制，脱粘和拔出的束从准分形断裂表面，相应的长度是随机变量预测的模型，根据各自的束强度分布和断裂力学。参数研究表明，复合材料的韧性更强的纤维具有较大的强度变化，和中间值的界面韧性和摩擦。预测验证对四个不同的复合材料铺层系统在文献中测试，证明模型的能力，捕捉不仅尺寸效应，而且不同的纤维和树脂的影响。(C)2014爱思唯尔有限公司版权所有。
The translaminar fracture toughness of fibre-reinforced composites is a size-dependent property which governs the damage tolerance and failure of these materials. This paper presents the development, implementation and validation of an original analytical model to predict the tensile translaminar (fibre-dominated) toughness of composite plies and bundles, as well as the associated size effect. The model considers, as energy dissipation mechanisms, debonding and pull-out of bundles from quasi-fractal fracture surfaces; the corresponding lengths are stochastic variables predicted by the model, based on the respective bundle strength distributions and fracture mechanics. Parametric studies show that composites are toughened by stronger fibres with large strength variability, and intermediate values of interfacial toughness and friction. Predictions are validated against four different composite ply systems tested in the literature, proving the models ability to capture not only size effects, but also the influence of different fibres and resins. (C) 2014 Elsevier Ltd. All rights reserved.