Damage in single lap joints of woven fabric reinforced polymeric composites subjected to transverse impact loading
Damage in single lap joints of woven fabric reinforced polymeric composites subjected to transverse impact loading
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DOI：
10.1016/j.ijimpeng.2015.02.003
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发表时间：
2015-06-01
影响因子：
5.1
通讯作者：
Day, R.
中科院分区：
文献类型：
--
作者：
Choudhry, R. S.;Hassan, Syed F.;Day, R.
在低速冲击范围内，采用半球形冲击器对具有4种不同重叠宽度的玻璃织物增强酚醛复合材料单搭接接头进行了不同速度的横向冲击。通过透射摄影、超声c扫描和x射线显微断层扫描（XMT）在不同长度尺度（从微观到宏观）上观察所产生的损伤，相互支持。这些实验观察结果被用于根据损伤规模、位置（即层、层之间的界面或两个粘附体之间的粘结破坏）和机制，以及重叠宽度和冲击速度的变化对损伤进行分类。此外，采用有限元方法模拟了分层和脱粘破坏。这些模拟进一步解释了观察到的损伤与重叠宽度和冲击速度的关系。这些实验和模拟的结果导致提出了上下特征重叠宽度的概念。在给定的冲击速度范围内，这些边界将主要的损伤模式（即规模、位置和机制）与关节的重叠宽度联系起来。(C) 2015 Elsevier Ltd.版权所有。
Single lap joints of woven glass fabric reinforced phenolic composites, having four different overlap widths, were impacted transversely using a hemispherical impactor with different velocities in the low velocity impact range. The resulting damage was observed at various length scales (from micro to macro) using transmission photography, ultrasonic c-scan and x-ray micro tomography (XMT), in support of each other. These experimental observations were used for classification of damage in terms of damage scale, location (i.e. ply, interfaces between plies or bond failure between the two adherends) and mechanisms, with changing overlap width and impact velocity. In addition, finite element analysis was used to simulate delamination and disbond failure. These simulations were used to further explain the observed dependence of damage on overlap width and impact velocity. The results from these experiments and simulations lead to the proposal of a concept of lower and upper characteristic overlap width. These bounds relate the dominant damage pattern (i.e. scale, location and mechanism) with overlap width of the joint for a given impact velocity range. (C) 2015 Elsevier Ltd. All rights reserved.