Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 69, Issue 14, Pages 2345-2351Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2009.01.034
Keywords
Polymer matrix composites; Fracture; Delamination; Fractography; Failure criteria
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Funding
- Engineering and Physical Sciences Research Council [GR/T26696/01] Funding Source: researchfish
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This paper describes fractographic observations from the detailed examination of delamination fracture surfaces and offers an interpretation of the key growth mechanisms. Firstly, the relationship between toughness, delamination failure criteria and fracture morphology is presented and the influence of cusp formation and deformation on toughness is discussed. Observations regarding delaminations migrating through the lamina at multidirectional ply interfaces are then discussed. It is demonstrated how this migration process can be avoided in fracture toughness coupons and consequently the toughness of multidirectional ply interfaces can be characterised. The influence of migration on delamination growth from embedded defects in laminates under compression is presented, and these results are extended to demonstrate how migration influences damage growth in structures. The paper concludes by making recommendations for realistic modelling of migration, and suggests how it can be exploited in damage tolerant structural design. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
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