Measurement of resistance curves in the longitudinal failure of composites using digital image correlation

G. Catalanotti, P. P. Camanho*, J. Xavier, C. G. Dávila, A. T. Marques

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

123 Citations (Scopus)

Abstract

This paper presents a new methodology to measure the crack resistance curves associated with fiber-dominated failure modes in polymer-matrix composites. The crack resistance curves not only characterize the fracture toughness of the material, but are also the basis for the identification of the parameters of the softening laws used in the numerical simulation of fracture in composite materials. The proposed method is based on the identification of the crack tip location using Digital Image Correlation and the calculation of the J-integral directly from the test data using a simple expression derived for cross-ply composite laminates. It is shown that the results obtained using the proposed methodology yield crack resistance curves similar to those obtained using Finite Element based methods for compact tension carbon-epoxy specimens. However, it is also shown that, while the Digital Image Correlation based technique mitigates the problems resulting from Finite Element based data reduction schemes applied to compact compression tests, the delamination that accompanies the propagation of a kink-band renders compact compression test specimens unsuitable to measure resistance curves associated with fiber kinking.

Original languageEnglish
Pages (from-to)1986-1993
Number of pages8
JournalComposites Science and Technology
Volume70
Issue number13
DOIs
Publication statusPublished - Nov 2010
Externally publishedYes

Keywords

  • A. Polymer-matrix composites (PMCs)
  • B. Fracture toughness

ASJC Scopus subject areas

  • Engineering(all)
  • Ceramics and Composites

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