A modified criterion for shear band formation in bulk metallic glass under complex stress states

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:527

Article

Guo, Y. Z.¹  Li, Y. L.¹  Wu, X. L.²  Wei, Q.³ 

[1] Northwestern Polytech Univ, Sch Aeronaut, Xian 710072, Shaanxi, Peoples R China

[2] Chinese Acad Sci, Inst Mech, Beijing 100910, Peoples R China

[3] Univ N Carolina, Dept Mech Engn, Charlotte, NC USA

关键词: Bulk metallic glasses;    Shear bands;    Yielding criterion;   

DOI  :  10.1016/j.msea.2009.12.045

来源: Elsevier

【 摘 要 】

A new criterion for shear band formation in metallic glasses is proposed based on the shear plane criterion proposed by Packard and Schuh [1]. This modified shear plane (MSP) criterion suggests that a shear band is not initiated randomly throughout the entire material under stress but is initiated at the physical boundaries or defects and at locations where the highest normal stress modified maximum shear stress occurs. Moreover, the same as in the shear plan criterion, the shear stress all over the shear band should exceed the shear yield strength of the material. For a complete shear band to form, both requirements need to be fulfilled. The shear yield strength of the material is represented by the shear stress of the point at which the shear band stops. The new criterion agrees very well with experimental results in both the determination of the shear yield strength and the shear band path. (C) 2010 Elsevier B.V. All rights reserved.

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