期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 90, 期 -, 页码 33-44出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2016.05.031
关键词
Thin-ply prepreg; Translaminar fracture toughness; Size effects; Ply-blocking; SEM; X-ray
资金
- Portuguese Foundation for Science and Technology [SFRH/BD/66414/2009]
- Airbus
- Fundação para a Ciência e a Tecnologia [SFRH/BD/66414/2009] Funding Source: FCT
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.
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