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Philosophical Magazine Volume 92, 2012 - Issue 7
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Part A: Materials Science

Crystal plasticity-based constitutive modelling of irradiated bcc structures

Anirban Patra School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USACorrespondence[email protected]
&
David L. McDowell School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA; GWW School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
Pages 861-887 | Received 16 May 2011, Accepted 10 Oct 2011, Published online: 24 Nov 2011
 
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Abstract

A constitutive crystal plasticity model is proposed and developed for the inelastic deformation of irradiated bcc ferritic/martensitic steels. Defects found in these irradiated materials are used as substructure variables in the model. Insights from lower length- and time-scale simulations are used to frame the kinematic and substructure evolution relations of the governing deformation mechanisms. Models for evolution of mobile and immobile dislocations, as well as interstitial loops (formed due to irradiation), are developed. A rate theory-based approach is used to model the evolution of point defects generated during irradiation. The model is used to simulate the quasi-static tensile and creep response of a martensitic steel over a range of loading histories.

Acknowledgements

The authors are grateful to Professor C.S. Deo and Professor T. Zhu of Georgia Tech for valuable discussions regarding this work and bridging to atomistic studies. This research has been supported by DOE NEUP award DE-AC07-05ID14517 09-269.

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