Role of strain-rate sensitivity in the crystal plasticity of hexagonal structures |
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Authors: | Benoît Beausir László S Tóth Kenneth W Neale |
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Institution: | 1. Laboratoire de Physique et Mécanique des Matériaux, Université de Metz, Ile du Saulcy, 57045 Metz, France;2. Faculté de génie, Université de Sherbrooke, Sherbrooke, Que., Canada J1K 2R1 |
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Abstract: | In the first part of this paper the stress and strain-rate response of hexagonal crystal structures are examined when slip is viscoplastic according to a power law. The stress and strain-rate equi-potential surfaces are constructed and discussed as a function of the strain-rate sensitivity index m. The second part of this paper deals with the case of linear viscous slip; i.e., for the case when m is equal to one. A simple analytic solution is presented to obtain the deviatoric stress state for a given strain-rate. It is shown that the plastic spin is not zero for m = 1 in hexagonal crystal structures, contrary to the cubic case where the plastic spin vanishes. In addition, the rate of texture evolution in simple shear of a magnesium polycrystal is examined as a function of m. |
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Keywords: | Crystal plasticity Strain-rate sensitivity Plastic spin Hexagonal Viscous slip |
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