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Crack Kinking Criterion for Bimaterial System

[+] Author Affiliations
Jianliang Yao, Toshihisa Nishioka, Takuma Nozaki, Takehiro Fujimoto

Kobe University of Mercantile Marine, Kobe, Hyogo Prefecture, Japan

Paper No. PVP2002-1204, pp. 163-170; 8 pages
doi:10.1115/PVP2002-1204
From:
  • ASME 2002 Pressure Vessels and Piping Conference
  • New and Emerging Computational Methods: Applications to Fracture, Damage, and Reliability
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-1949-3
  • Copyright © 2002 by ASME

abstract

This paper is aimed to find out a suitable criterion for predicting the interfacial crack in the bimaterial system. An investigation was undertaken into the interfacial crack kinking phenomena in a bimaterial specimen of epoxy and aluminum alloy using a combination of experimental method and numerical simulation. It was found that all kinked fractures occurred at loading angles equal to or larger than 120°, so the kinking direction heavily dependeds on the loading mode mixity. Three categories of fracture pattern were identified (A, B and C). In the case of type A fracture, the (J1 0 )kink integrals were generally higher than the homogeneous epoxy Jic at loading angles of 120° and above. In contrast, for types B and C fracture, the J1 0 integrals were consistently lower than the homogeneous epoxy Jic . Predictions of crack kinking behavior made using the Maximum Energy Release Rate Criterion (MG-criterion) were found to agree well with the observed experimental results. The kinked deformation of crack tip observed by moiré interferometry, is well agreed with the result of numerical simulation.

Copyright © 2002 by ASME

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