Fracture toughness of a constrained metal layer

Guoyu Lin, Yun Jae Kim, A. Cornec, K. H. Schwalbe

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Abstract

Crack growth in a metal layer constrained by two elastic substrates, with a crack lying in the center of the metal layer, was simulated via a 2D plane strain, finite element (FE) analysis. The fracture process was modeled using a cohesive zone model (CZM) where the fracture process zone is represented by a microscale strip (cohesive zone) and is described by a continuum traction-separation law with a constant traction T0 and the work of separation per unit area, Γ0. The interfaces between the ductile layer and the elastic substrates were assumed to be perfectly bonded. The crack growth resistance curves were computed by applying mode I loading under small scale yielding conditions. Attention was focused on the effect of the CZM parameter, T0, and the layer thickness on fracture resistance. Two fracture mechanisms were found: (1) near-tip void growth and coalescence with the main crack and (2) cavitation at highly stressed sites far ahead of the crack tip. The steady-state toughness and the toughness at which first cavitation occurs were quantitatively given in terms of the CZM parameter, T0, and the layer thickness for both fracture mechanisms.

Original languageEnglish
Pages (from-to)36-47
Number of pages12
JournalComputational Materials Science
Volume9
Issue number1-2
Publication statusPublished - 1997 Dec 1

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ASJC Scopus subject areas

  • Computer Science(all)
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Computational Mathematics

Cite this

Lin, G., Kim, Y. J., Cornec, A., & Schwalbe, K. H. (1997). Fracture toughness of a constrained metal layer. Computational Materials Science, 9(1-2), 36-47.