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Subject Keyword Abstract Author
 
 
Recresistance of high-toughness grains to cleavage cracking in a polycrystalline, brittle material

Weiyi Lu, Jin Chen, Srinivas S. Chakravarthula, Falgun B. Surani and Yu Qiao*
The Journal of Mechanical Science and Technology, vol. 25, no. 10, pp.2545-2549, 2011

Abstract : As a cleavage crack propagates through a field of randomly oriented grains, due to the variation in local fracture resistance, the crack front advance is nonuniform. The crack would first penetrate into the low-toughness grains, leaving the high-toughness ones behind its front. In this article, the barrier effect of the high-toughness grains is investigated in considerable detail through a computational analysis. The dominant factors are the grain size and the effective content of high-toughness grains.

Keyword : Fracture toughness; Grain boundary; Cleavage; Crack trapping effect
 
 
 
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