Experimental Evaluation of the Taylor-Type Polycrystal Model for the Finite Deformation of an FCC Metal (OFHC Copper)
ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
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Large deformation uniaxial compression and fixed-end torsion simple shear experiments were conducted on annealed OFHC Copper to obtain its stress- strain behavior. This material behavior was also predicted using the Taylor-type rate dependent polycrystal model by Asaro and Needleman. Simulations of the experiments were conducted in personal computers, using a recently developed, highly efficient, fully implicit, time integration scheme by Kalidindi et al. In the initial phase of the simulation, the evolution of the constituent single crystal slip system deformation resistance was estimated using the experimentally determined compressive stress-strain behavior of the polycrystal. With this crystal constituent behavior, the stress-strain behavior of the polycrystal for simple shear was computed.