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Mode III interlaminar fracture of carbon/epoxy laminates using the edge crack torsion (ECT) test

Authors
Journal
Composites Science and Technology
0266-3538
Publisher
Elsevier
Publication Date
Volume
69
Issue
5
Identifiers
DOI: 10.1016/j.compscitech.2008.12.019
Keywords
  • A. Polymer–Matrix Composites (Pmcs)
  • B. Fracture Toughness
  • B. Delamination
  • C. Finite Element Analysis (Fea)
  • Mode Iii
Disciplines
  • Mathematics

Abstract

Abstract The mode III interlaminar fracture of carbon/epoxy laminates was evaluated with the edge crack torsion (ECT) test. Three-dimensional finite element analyses were performed in order to select two specimen geometries and an experimental data reduction scheme. Test results showed considerable non-linearity before the maximum load point and a significant R-curve effect. These features prevented an accurate definition of the initiation point. Nevertheless, analyses of non-linearity zones showed two likely initiation points corresponding to G III c values between 850 and 1100 J/m 2 for both specimen geometries. Although any of these values is realistic, the range is too broad, thus showing the limitations of the ECT test and the need for further research.

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