A plate model for compressive strength prediction of delaminated composites

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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.

Original languageEnglish
Pages (from-to)509-517
Number of pages9
JournalComposite Structures
Volume210
Early online date24 Nov 2018
DOIs
Publication statusPublished - 15 Feb 2019

Keywords

  • Buckling
  • CAI
  • Damage tolerance
  • Delamination
  • Impact
  • Modelling

ASJC Scopus subject areas

  • Ceramics and Composites
  • Civil and Structural Engineering

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