A two-dimensional in situ fatigue cohesive zone model for crack propagation in composites under cyclic loading

S. Nojavan, D. Schesser, Q. D. Yang

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

In this paper a two-dimensional fatigue cohesive zone model (CZM) for crack propagation in composites under cyclic loading has been formulated and validated through successful predictions of fatigue crack growth under pure and mixed mode conditions for several different composites. The proposed fatigue CZM assumes simple power-law functions for fatigue damage accumulation of which the damage parameters can be calibrated from simple fatigue tests under pure mode I and mode II conditions. The model relies solely on the in situ cohesive responses for fatigue damage rate calculation, enabling the differentiation of the local elemental load history from the global load history. An effective cycle jump strategy for high-cycle fatigue has also been proposed. It has been demonstrated that once calibrated, the fatigue CZM can predict the Paris laws for the pure modes. Furthermore, it can predict the Paris laws of any mixed-mode conditions without the need of additional empirical parameters. This is of significant practical importance because it leads to greatly reduced experimental needs for mixed mode crack propagation widely observed in composites under cyclic loads.

Original languageEnglish (US)
Pages (from-to)449-461
Number of pages13
JournalInternational Journal of Fatigue
Volume82
DOIs
StatePublished - Jan 1 2016

Keywords

  • Cohesive zone models
  • Composite fracture
  • Fatigue

ASJC Scopus subject areas

  • Modeling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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