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Crack-Dislocation Modeling of Ductile-To-Brittle Transitions in Multilayered Materials

Published online by Cambridge University Press:  15 February 2011

Peter M. Anderson  and
Canhao Li
Peter M. Anderson
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, 116 W. 19th Ave., Columbus, OH 43210-1179
Canhao Li
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, 116 W. 19th Ave., Columbus, OH 43210-1179
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Abstract

Using elastic fields of dislocations in a layered material, a simple form of a periodic potential is proposed to account for the fluctuation in dislocation line energy with position in a multilayer. This potential is incorporated into a fracture analysis which uses a Rice-Thomson criterion for dislocation emission [1] and a corresponding local stress intensity factor condition for cleavage extension. The analysis is rate-dependent, in that the velocity of a nucleated dislocation is proportional to the energetic force on that dislocation. Predictions of dislocation patterns in the vicinity of a crack parallel to the interface, as well as initial R-curve behavior, are discussed as a function of loading rate, layer thickness, and elastic properties of a two-component multilayer.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 308: Symposium M1 – Thin Films: Stresses and Mechanical Properties IV , 1993 , 731
Copyright
Copyright © Materials Research Society 1993

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References

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