Dynamic cleavage in ductile materials

被引:13
作者
Lin, I. -H. [1 ]
Thomson, R. M. [2 ]
机构
[1] Natl Bur Stand, Fracture & Deformat Div, Boulder, CO 80303 USA
[2] Natl Bur Stand, Inst Mat Sci & Engn, Gaithersburg, MD USA
关键词
D O I
10.1557/JMR.1986.0073
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Ductile materials are found to sustain brittle fracture when the crack moves at high speed. This fact poses a paradox under current theories of dislocation emission, because even at high velocities, these theories predict ductile behavior. A theoretical treatment of time-dependent emission and cleavage is given which predicts a critical velocity above which cleavage can occur without emission. Estimates suggest that this velocity is in the neighborhood of the sound velocity. The paper also discusses the cleavage condition under mixed mode loading, and concludes that the cleavage condition involves solely the mode I loading, with possible sonic emission under such loadings.
引用
收藏
页码:73 / 80
页数:8
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