Applying modified Weibull failure theory to bimaterial specimen under thermal loading

M. P.H. Khandaker, Stephen Ekwaro-Osire, K. Gautam

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Abstract

Failure of a thermally loaded bimaterial specimen was investigated in this research. A high-stress gradient due to thermal loading occurs around the free edge of the interface of the bimaterial specimen. This high-stress gradient plays an important role in the failure of the specimen. The Weibull failure theory has been shown to be unable to account for high-stress gradients in externally loaded bimaterial specimens. The objective of this work is to develop a weight function method to calculate the effective stress intensity factors in the vicinity of a high-stress gradient in a thermally loaded bimaterial specimen, and to develop a modified Weibull failure theory to handle the high-stress gradient. It was found that the modified Weibull failure theory generated monotonous trends for the probability of failure with respect to increasing Weibull moduli, as demonstrated in the literature.

Original languageEnglish
Pages (from-to)281-294
Number of pages14
JournalFatigue and Fracture of Engineering Materials and Structures
Volume31
Issue number3-4
DOIs
StatePublished - Mar 1 2008

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Keywords

  • Bimaterial
  • High-stress gradient
  • Thermal loading
  • Weibull failure theory

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