Modeling the response of HCP polycrystals deforming by slip and twinning using a finite element representation of the orientation space |
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Authors: | Babak Kouchmeshky Nicholas Zabaras |
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Affiliation: | aMaterials Process Design and Control Laboratory, Sibley School of Mechanical and Aerospace Engineering, 101 Frank H. T. Rhodes Hall, Cornell University, Ithaca, NY 14853-3801, USA |
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Abstract: | A continuum approach is presented for predicting the constitutive response of HCP polycrystals using a simple non-hardening constitutive model incorporating both slip and twinning. This has been achieved by considering a physically based methodology for restricting the amount of the twinning activity. A continuum approach is used in modeling the texture evolution that eliminates the need for increasing the number of discrete crystal orientations to account for new orientations created by twinning during deformation. The polycrystal is represented by an orientation distribution function using the Rodrigues parameterization. A total Lagrangian framework is used to model the evolution of microstructure. Numerical examples are used to show the application of the methodology for modeling deformation processes. |
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Keywords: | Polycrystal plasticity Texture Twinning Slip Finite element analysis |
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