Damage progression and defect sensitivity: An experimental study of representative wrinkles in tension
Damage progression and defect sensitivity: An experimental study of representative wrinkles in tension
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DOI：
10.1016/j.compositesb.2012.05.021
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发表时间：
2013-02-01
影响因子：
13.1
通讯作者：
Potter, K. D.
中科院分区：
文献类型：
--
作者：
Bloom, L. D.;Wang, J.;Potter, K. D.
本文对局部起皱缺陷对玻璃增强环氧树脂层板强度的影响进行了实验研究。一种基于“自然”形成机制的产生褶皱的方法被开发出来，并用于制造更大规模的层压板，目的是代表工业部件。皱折的严重程度是用光学显微镜来表征的，并与拉伸测试的结果相关联，拉伸测试表明，最严重的不对准会导致40%的强度断裂。两种光学系统-数字图像相关和视频延伸测量用于可视化应变分布，显示皱纹周围高度局部的集中。探讨了应变分布在损伤发生和发展过程中的作用，并对复合材料构件的设计提出了建议。(c) 2012 Elsevier Ltd.版权所有。
This paper presents an experimental study on the effect of localised wrinkling defects on the strength of glass reinforced epoxy laminates. A method for generating wrinkles based on the 'natural' mechanism of formation was developed and used to make larger scale laminates, with the aim of being representative of industrial components. Wrinkle severity was characterised using optical microscopy and correlated to the results obtained from tensile testing, which showed that the most serious misalignment can cause a 40% strength knock-down. Two optical systems - Digital Image Correlation and Video Extensometry were used to visualise the strain distribution, which showed highly localised concentrations surrounding the wrinkle. The role of the strain distribution in causing the initiation and progression of damage is explored, and finally some implications for the design of composite components are considered. (c) 2012 Elsevier Ltd. All rights reserved.