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Microstructural Behavior and Failure of FCC Crystalline Aggregates

Published online by Cambridge University Press:  26 July 2012

O. Rezvanian ,
M. A. Zikry  and
A. M. Rajendran
O. Rezvanian
Affiliation:
orezvan@ncsu.edu, North Carolina State University, Mechanical and Aerospace Engineering, 2601 Stinson Dr, Campus Box 7910, Raleigh, NC, 27695, United States
M. A. Zikry
Affiliation:
zikry@ncsu.edu, North Carolina State University, Department of Mechanical and Aerospace Engineering, Raleigh, NC, 27695, United States
A. M. Rajendran
Affiliation:
raj.rajendran@us.army.mil, North Carolina State University, Department of Mechanical and Aerospace Engineering, Raleigh, NC, 27695, United States
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Abstract

A unified dislocation density-based microstructural representation of f.c.c. crystalline materials, has been developed such that the microstructural behavior can be accurately predicted at different physical scales. This microstructural framework is based on coupling a multiple-slip crystal plasticity formulation to three distinct dislocation densities, which pertain to statistically stored dislocations (SSDs), geometrically necessary dislocations (GNDs), and grain boundary dislocations (GBDs). This interrelated dislocation-density formulation is then used with specialized finite-element modeling techniques to predict the evolving heterogeneous microstructure and the localized phenomena that can contribute to failure initiation as a function of inelastic deformation.

Keywords

microstructuredislocationspolycrystal
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 976: Symposium EE – Size Effects in the Deformation of Materials – Experiments and Modeling , 2006 , 0976-EE02-02
Copyright
Copyright © Materials Research Society 2007

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