Propagation of a cleavage crack front across a field of persistent grain boundaries

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:49

Article

Lu, Weiyi¹  Chakravarthula, Srinivas S.²  Chen, Jin¹  Qiao, Yu¹ 

[1] Univ Calif San Diego, Dept Struct Engn, La Jolla, CA 92093 USA

[2] Univ Akron, Dept Civil Engn, Akron, OH 44325 USA

关键词: Fracture toughness;    Grain boundary;    Cleavage;    Nonuniform;   

DOI  :  10.1016/j.ijsolstr.2011.11.003

来源: Elsevier

【 摘 要 】

The nonuniform propagation of a cleavage front across a field of persistent grain boundaries is analyzed. When a cleavage crack advances in a field of grains, some of the grain boundaries cannot be directly broken through, which interrupts the crack growth process. When the crack front bypasses such persistent grain boundaries (PGB), the overall crack growth driving force must be increased so that the local stress intensity can overcome the local fracture resistance. A theoretical model is developed based on the R-curve analysis. A closed-form expression of the critical stress intensity factor is given as a function of the line content of PGB. (C) 2011 Elsevier Ltd. All rights reserved.

【 授权许可】

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