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

Anton Köllner, Mark W.D. Nielsen, Jiraphant Srisuriyachot, Andrew T. Rhead, Richard Butler

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number107468
JournalThin-Walled Structures
Volume161
Early online date29 Jan 2021
DOIs
Publication statusE-pub ahead of print - 29 Jan 2021

Keywords

  • BVID
  • CAI
  • Damage tolerance
  • Delamination buckling
  • Energy release rate
  • Mixed-mode fracture

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering

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