A plate model for compressive strength prediction of delaminated composites
Journal article
Choudhry, Rizwan Saeed, Rhead, Andrew T., Nielsen, Mark W.D. and Butler, Richard 2018. A plate model for compressive strength prediction of delaminated composites. Composite Structures. https://doi.org/10.1016/j.compstruct.2018.11.066
| Authors | Choudhry, Rizwan Saeed, Rhead, Andrew T., Nielsen, Mark W.D. and Butler, Richard |
|---|---|
| Abstract | Damage tolerance is of critical importance to laminated composite structures. In this paper, we present a new semi-analytical method for predicting the strain at which delamination propagation will initiate following sublaminate buckling. The method uses a numerical strip model to determine the thin-film buckling strain of an anisotropic sub-laminate created by delamination, before evaluating the strain energy release rate for delamination propagation. The formulation assumes that all energy is available for propagation in a peeling mode (Mode I); avoiding an approximate mixed-mode criterion. Results are compared with twelve experimentally obtained propagations strains, covering a variety of laminates each containing a circular PTFE delamination. Comparison shows agreement to within 12% for balanced sublaminate tests in which delamination propagation occurred before intra-ply cracking. The method can be used to significantly improve the damage tolerance of laminates, opening up new opportunities for structural efficiency using elastic tailoring, non-standard ply angles and material optimisation. |
| Keywords | Damage tolerance; Delamination; CAI; Modelling; Impact; Buckling |
| Year | 2018 |
| Journal | Composite Structures |
| Publisher | Elsevier |
| ISSN | 0263-8223 |
| 1879-1085 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1016/j.compstruct.2018.11.066 |
| Web address (URL) | http://hdl.handle.net/10545/623174 |
| hdl:10545/623174 | |
| Publication dates | 24 Nov 2018 |
| Publication process dates | |
| Deposited | 04 Dec 2018, 15:07 |
| Accepted | 23 Nov 2018 |
| Rights | Archived with thanks to Composite Structures |
| Contributors | University of Derby and University of Bath |
| File | File Access Level Open |
| File |
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