Finite element analysis of interface crack in bimaterial media using cohesive force model

Masaki Omiya, Kikuo Kishimoto, Toshikazu Shibuya

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The intent of this paper is to investigate mixed mode interface fracture toughness Jc. Many workers have shown by experiments that the interface fracture toughness depends on the mode mixity. However, the definition of the interface stress intensity factor is not clarified and therefore the mode mixity varies with the characteristic length L of the interface stress intensity factor. To evaluate the strength of an interface, it is important to model the fracture behavior of the interface. The cohesive force model is a direct way to represent the interface nonlinear properties. Based on the internal variable theory of thermodynamics, a continuum interface constitutive relation between interface traction and interface separation has been developed. In this paper, we apply this constitutive model to the interface crack. The interface fracture toughness is analyzed for a wide range of bimaterial constant by Finite Element Method. The results show that the fracture boundary curve is elliptical shape and changes with the ratio of the Young's modulus. The interface fracture toughness is strongly influenced by the mode mixity. However, if the characteristic length L of the interface stress intensity factor is chosen suitably, the intrinsic fracture criterion can be derived.

Original languageEnglish
Pages (from-to)532-539
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume66
Issue number643
DOIs
Publication statusPublished - 2000 Jan 1
Externally publishedYes

Keywords

  • Bimaterial
  • Cohesive force model
  • Damage mechanics
  • Finite Element Method
  • Fracture criterion
  • Fracture toughness
  • Interface crack
  • Mixed mode
  • Stress intensity factor

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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