Thickness-dependence of the translaminar fracture toughness: Experimental study using thin-ply composites
Thickness-dependence of the translaminar fracture toughness: Experimental study using thin-ply composites
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DOI：
10.1016/j.compositesa.2016.05.031
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发表时间：
2016-11-01
影响因子：
8.7
通讯作者：
Robinson, P.
中科院分区：
文献类型：
--
作者：
Teixeira, R. F.;Pinho, S. T.;Robinson, P.
层间0度跨层流断裂韧度的概念使得层合复合材料结构失效的大量层级数值模型得以发展。使用薄层预浸料，本文证明了这种跨层流韧性不是绝对的，而是原位的，并且强烈地依赖于0度铺层块厚度，即使在防止分层和扩散损伤的情况下也是如此。我们使用两种不同牌号的薄层碳-环氧树脂体系生产了四种不同厚度的0度铺层块，厚度从0.03 mm到0.12 mm不等，并用紧凑拉伸试验测量了各自的透层断裂韧性。扫描电子显微镜和X射线分析未见明显的剥离和弥漫性损伤。然而，在上述厚度范围内，层流断裂韧性从46 kJ/m(2)(起始)增加到104 kJ/m(2)(起始)，从49 kJ/m(2)增加到160 kJ/m(2)(扩展)。这一发现对于发展和使用铺层水平的数值失效模型、薄层复合材料的结构设计以及薄层材料体系的发展具有重要的意义。皇冠版权所有(C)2016由爱思唯尔有限公司出版。保留所有权利。
The concept of translaminar fracture toughness of 0 degrees plies has enabled the development of a considerable number of ply-level numerical models for structural failure of laminated composites. Using thin-ply pre-pregs, this paper demonstrates that this translaminar toughness is not an absolute, but rather in-situ, property and depends strongly on the 0 degrees ply-block thickness, even in situations where delamination and diffuse damage are inhibited. We used two different grades of a thin-ply carbon-epoxy system to produce four different 0 degrees ply-block thicknesses ranging from 0.03 mm to 0.12 mm, and measured the respective translaminar fracture toughness using compact tension tests. SEM and X-ray analysis showed no delamination nor diffuse damage. Yet, the translaminar fracture toughness increased from 46 to 104 kJ/m(2) (initiation), and from 49 to 160 kj/m(2) (propagation), for the thickness range above. This finding has significant implications for the development and use of ply-level numerical failure models, for structural design with thin-ply composites, and for the development of thin-ply material systems. Crown Copyright (C) 2016 Published by Elsevier Ltd. All rights reserved.