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Journal of Materials Science

, Volume 30, Issue 20, pp 5281–5286 | Cite as

Effects of residual stress on toughening of brittle polycrystals

  • D. K. M. Shum
Article

Abstract

The effects of residual stress on toughening of brittle polycrystalline materials, in the absence of microcracking, were investigated by considering the mode I stress intensity factor reduction at the tip of a stationary crack under combined applied and residual stress loading. Toughness enhancement associated with a number of model singular and non-singular residual stress fields was evaluated. The singular residual stress fields were used to model grain-sized thermal expansion anisotropy due to grain-orientation differences in a polycrystal. The numerical results indicate that residual stress can significantly toughen a stationary crack against initiation. For the same average value of residual stress, toughness enhancement due to singular residual stress fields is more substantial than that due to non-singular residual stress fields. Sample toughness enhancement results are presented for a single-phase polycrystal failing by intergranular fracture.

Keywords

Brittle Residual Stress Thermal Expansion Stress Intensity Intensity Factor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • D. K. M. Shum
    • 1
  1. 1.Saint-Gobain/Norton Industrial Ceramics CorporationNorthboroUSA

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