Toughening a bulk metallic glass through mode II fracture under mode I loading

被引：0
|
作者：
Yi, Jun [1 ]
Yang, Na [1 ,2 ]
Huang, Bo [1 ]
Jiang, Sida [3 ]
Kou, Shengzhong [2 ]
Wang, Gang [1 ]
机构：
[1] Shanghai Univ, Inst Mat, Sch Mat Sci & Engn, Shanghai 200444, Peoples R China
[2] Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Gansu, Peoples R China
[3] Harbin Inst Technol, Space Environm Simulat Res Infrastruct, Harbin 150001, Peoples R China
来源：
JOURNAL OF NON-CRYSTALLINE SOLIDS | 2023年 / 600卷
基金：
中国国家自然科学基金;
关键词：
Mode II fracture; Circular arc shear band; Prandtl slip line; Viscous fingering; HIGH-TOUGHNESS; BEHAVIOR;
D O I：
10.1016/j.jnoncrysol.2022.122007
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
High fracture toughness is vital for resisting catastrophic fracture of engineering structural materials which break through cavitation instability. We report a new toughening mechanism which totally suppressed cavitation through pure mode II fracture which was induced by pivoting around circular arc shear bands in a bulk metallic glass under mode I loading. We demonstrated that the mode II crack propagated along the outmost circular arc shear band along Prandtl slip line which is the orientation of maximum shear stress ahead of crack tip. Our theoretical investigation revealed that enhanced critical hydrostatic tension for cavitation which changed the stress field ahead of fatigue crack tip would be the trigger for pivoting which would increase energy dissipation and prevent hydrostatic tension ahead of crack tip from increasing. The present work would assist in guiding microstructure design to produce monolithic and composite materials with enhanced fracture toughness.
引用
收藏
页数：6
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