材料科学
剪切带
剪切(地质)
复合材料
可塑性
非晶态金属
绝热剪切带
变形(气象学)
极限抗拉强度
变形机理
微观结构
合金
作者
J.Y. Lee,Kichang Han,J.M. Park,K. Chattopadhyay,W.T. Kim,D.H. Kim
出处
期刊:Acta Materialia
[Elsevier]
日期:2006-11-01
卷期号:54 (19): 5271-5279
被引量:49
标识
DOI:10.1016/j.actamat.2006.07.014
摘要
Shear band formation and failure mechanism in monolithic glasses and glass matrix composite exhibiting a wide range of plasticity were investigated by interrupted compression experiments. The major shear bands in monolithic glasses appear rapidly after a small deformation, and their numbers remain almost same in the later stages of deformation. The path of the crack growth does not coincide strictly with the shear band. The larger plastic strain in glasses exhibiting higher ductility is mainly accommodated in the primary shear band by forming larger shear offset prior to failure. The failure mechanism under compression is not pure shear, but mixed mode with evidence of a tensile component, which leads to the formation of microvoids (microcracks). Bridging of the microvoids leads to final fracture. In the case of glass composite containing particles, the microcracks at the interface arrest the propagation of the existing shear bands and form additional shear bands, improving plasticity.
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