Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 26, Issue 12, Pages 1772-1791Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2010.03.005
Keywords
Polycrystal; Texture; Neutron diffraction; Finite strain; Jaumann derivative
Funding
- Department of Energy's Office of Basic Energy Sciences
- DOE [DE-AC52-06NA25396]
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering
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An elasto-plastic self-consistent (EPSC) polycrystal model is extended to account, in an approximate fashion, for the kinematics of large strains, rigid body rotations, texture evolution and grain shape evolution. In situ neutron diffraction measurements of the flow stress, internal strain, texture and diffraction peak intensity evolutions were performed on polycrystalline copper and stainless steel, up to true tensile strains of epsilon = 0.3. Suitably adjusted slip system hardening model parameters enable the model to quantitatively describe the flow stress of the polycrystalline aggregate. Quantitative predictions of the texture evolution and the internal strain evolution along the stress axis are good, while predictions of transverse internal strains (perpendicular to the tensile loading direction) are less satisfactory. The latter exhibit a large dispersion from grain to grain around a macroscopic average, and the implications of this finding for the interpretation of in situ neutron diffraction method are explored. Finally, as a demonstration of the applicability of the model to problems involving finite rotation, as well as deformation, simulations of simple shear were conducted which predict a texture evolution in agreement with published experimental data, and other modeling approaches as well. (C) 2010 Elsevier Ltd. All rights reserved.
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