Determination of mode I dynamic fracture toughness of IM7-8552 composites by digital image correlation and machine learning

Rafael A. Cidade*, Daniel S.V. Castro, Enrique M. Castrodeza, Peter Kuhn, Giuseppe Catalanotti, Jose Xavier, Pedro P. Camanho

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Citations (Scopus)
139 Downloads (Pure)

Abstract

An optical experimental procedure for evaluating the J-Integral from full-field displacement fields under dynamic loading is proposed in this work. The methodology is applied to measure the J-integral in the dynamic compressive loading of fiber-reinforced composites and to calculate the dynamic fracture toughness associated with the propagation of a kink-band. A modified J-Integral that considers inertia effects is calculated over the full-field measurements obtained by digital image correlation, for double edge-notched specimen of IM7-8552 laminates dynamically loaded in a split-Hopkinson pressure bar (SHPB). A sensibility study is conducted to address the influence of the speckle parameters. The results show good agreement with experimental observations obtained by using a different data reduction method, suggesting the existence of a rising R-curve for the studied material under dynamic loading. Furthermore, it was noticed that the inertia effect can be negligible, indicating a state of dynamic equilibrium in which quasi-static approaches may comfortably be used.
Original languageEnglish
Pages (from-to)707-714
Number of pages8
JournalComposite Structures
Volume210
Early online date01 Dec 2018
DOIs
Publication statusPublished - 15 Feb 2019

Keywords

  • Digital image correlation (DIC)
  • Dynamic fracture toughness
  • Fiber-reinforced composite materials
  • J-Integral

ASJC Scopus subject areas

  • Ceramics and Composites
  • Civil and Structural Engineering

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