Experimental determination of mode I fracture parameters in orthotropic materials by means of Digital Image Correlation

Riccardo Cappello, Giuseppe Pitarresi, José Xavier, Giuseppe Catalanotti*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The mode I fracture parameters for an orthotropic body are directly calculated from full-field deformation measurements provided by Digital Image Correlation (DIC). Three complementary and direct approaches are evaluated and compared: (i) the determination of the Stress Intensity Factor (SIF) by fitting the displacement field using the analytical expression proposed by Lekhnitskii; (ii) the determination of the J-Integral by using the Energy Domain Integral (EDI) formulation on the raw DIC data; and (iii) the calculation of the J-Integral using the EDI approach on the displacement data fitted using Lekhnitskii's formulation. A comparative experimental study is performed by testing an IM7/8552 cross-ply laminate, and the effect of different parameters is analysed and discussed. The outcomes of this work show that, if an accurate choice of the parameters is performed, the different approaches lead to the same results.

Original languageEnglish
Article number102663
JournalTheoretical and Applied Fracture Mechanics
Volume108
Early online date30 May 2020
DOIs
Publication statusPublished - 01 Aug 2020

Keywords

  • Digital image correlation
  • Energy domain integral
  • J-integral
  • Least squares fitting
  • Stress intensity factor

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Applied Mathematics

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