Buckle-driven delamination models for laminate strength prediction and damage tolerant design

Published on Apr 1, 2021in Thin-walled Structures4.033
· DOI :10.1016/J.TWS.2021.107468
Anton Köllner5
Estimated H-index: 5
(Imperial College London),
Mark Nielsen2
Estimated H-index: 2
(University of Bath)
+ 2 AuthorsRichard Butler21
Estimated H-index: 21
(University of Bath)
Sources
Abstract
Abstract Two state-of-the-art analytical compression after impact (CAI) modelling approaches are presented and evaluated for the problem of thin-film buckle-driven propagation of a delamination in composite laminates. Characteristic phenomena are investigated by evaluating the behaviour of the energy release rate of an anisotropic sublaminate above a 2D embedded delamination. These characteristics include extension-bend, shear-bend and bend-twist coupling as well as contact of sublaminate and base laminate. A holistic approach with the aid of a detailed analysis of deformation characteristics from artificial delamination experiments and finite element analysis provide strong validation of the modelling approaches. Suggestions are made regarding analytical methods suitable for use in the initial aerospace structural design stage. It is found that models which capture the mode-mixity and post-buckled energy terms accurately will allow for better design decisions to be made that are not overly conservative. Whereas methods, which do not account for such mixity and post-buckling, can nevertheless be used to design for damage tolerance.
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The authors gratefully acknowledge the support of the EPSRC (EP/N024354/1) funding for the ADAPT project. Richard Butler holds the Royal Academy of Engineering – GKN Aerospace Research Chair in Composites Analysis.
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