期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 106, 期 -, 页码 110-119出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2014.10.022
关键词
Discontinuous-ply composites; Non-linear behaviour; Delamination; Damage mechanics; Stress transfer
资金
- EPSRC [EP/I02946X/1]
- Engineering and Physical Sciences Research Council [EP/I02946X/1] Funding Source: researchfish
- EPSRC [EP/I02946X/1] Funding Source: UKRI
The inherent brittleness of continuous unidirectional fibre reinforced composites is a major drawback to their otherwise outstanding mechanical performance. This paper exploits composites with overlapped discontinuities at the ply level to create a significantly non-linear response, due to progressive interlaminar damage under tensile loading. Two distinct configurations were manufactured with the same carbon/epoxy system and tested under quasi-static tension, showing that varying the thickness and length of the overlapping ply blocks resulted in significantly different mechanical responses and failure. modes. A previously developed generalised shear-lag model was successfully used to optimise the overlap configuration, and accurately predicted the response in both strength- and toughness-dominated cases. This work demonstrates that unidirectional composites with well-designed discontinuities at the ply level can provide a significantly non-linear response with clear warning before failure, while retaining similar stiffness and up to 50% of the strength of their continuous counterparts. (C) 2014 The Authors. Published by Elsevier Ltd.
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