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Dynamic cleavage in ductile materials

Published online by Cambridge University Press:  03 March 2011

I.-H. Lin  and
R. M. Thomson
I.-H. Lin
Affiliation:
Fracture and Deformation Division, National Bureau of Standards, Boulder, Colorado 80303
R. M. Thomson
Affiliation:
Institute for Materials Science and Engineering, National Bureau of Standards, Gaithersburg, Maryland 20899
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Abstract

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

Type
Articles
Information
Journal of Materials Research , Volume 1 , Issue 1 , February 1986 , pp. 73 - 80
Copyright
Copyright © Materials Research Society 1986

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References

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