A Plastic Zone Equation Based on Mean Yield Criterion

Wei Deng; De Wen Zhao; Xiao Mei Qin; Xiu Hua Gao; Chun Lin Qiu; Lin Xiu Du

doi:10.4028/www.scientific.net/AMR.97-101.534

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 97-101A Plastic Zone Equation Based on Mean Yield...

A Plastic Zone Equation Based on Mean Yield Criterion

Abstract:

Based on mean yield criterion, an analytical solution for the mode I crack tip plastic zone (CTPZ) under small scale yielding was derived. The results reveal that the size of CTPZ determined by MY criterion is between those by Mises’ yield criterion the smallest, and by Tresca’s criterion the largest; while the zone is almost coincide with that by Mises’ one. The size of CTPZ is related to the ratio of fracture toughness to yield strength; with increasing of the ratio, the size of the zone increases, meaning the better of fracture toughness.