On fatigue crack growth in ductile materials by crack-tip blunting

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Abstract

One of the basic mechanisms for fatigue crack growth in ductile metals is that depending on crack-tip blunting under tensile loads and re-sharpening of the crack-tip during unloading. In a standard numerical analysis accounting for finite strains it is not possible to follow this process during many cycles, as severe mesh distortion at the crack-tip results from the huge geometry changes developing during the cyclic plastic straining. In the present numerical studies, based on an elastic-perfectly plastic material model, crack growth computations are continued up to 200 full cycles by using remeshing at several stages of the plastic deformation. Three different values of the load ratio R = K-min/K-max are considered. It is shown that the crack-up opening displacement, CTOD, typically undergoes a transient behaviour, with no crack closure during many cycles, before a steady-state cycling with crack closure at the tip starts to gradually develop. (C) 2004 Elsevier Ltd. All rights reserved.
Original languageEnglish
JournalJournal of the Mechanics and Physics of Solids
Volume52
Issue number9
Pages (from-to)2149-2166
ISSN0022-5096
DOIs
Publication statusPublished - 2004

Keywords

  • Fatigue
  • Plasticity
  • Crack growth
  • Large strains
  • Remeshing

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