The influence of fibre angle on the compressive strength of delaminated surface plies

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Abstract

An extremely efficient Strip Model which predicts
the applied strain below which initial local buckledriven
propagation of a delamination will not occur
is applied to a ±o surface sublaminate. The Strip
Model is shown to perform well, compared to
experiments and Finite Element Analysis, when the
mismatch between the Poisson’s ratio of the full
laminate and surface sublaminate is less than 0.5.
Laminates with larger mismatches which induce
lateral compression in the sub-laminate propagate
earlier than predicted. Mismatches that put the
delaminated sublaminate into transverse tension are
shown to improve resistance to delamination
propagation. The most favourable surface plies, both
in terms of strength following delamination and
buckling capacity of the full laminate are confirmed
to be ±45o.
Original languageEnglish
Number of pages10
Publication statusPublished - 21 Aug 2011

Keywords

  • Buckling
  • Delamination
  • Propagation
  • Poisson's ratio

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