In this paper we propose a new mesoplasticity theory that relates crystallineplasticity theory to dislocation theory. The new theoryrelates slip deformation in a crystal to the evolutionof dislocation loops to estimate the accumulation rateof dislocations in a crystal. The theory also relatesthe recovery process to the dislocation annihilationmechanism, and estimates its rate from therearrangement energy of dislocations. Based ondislocation densities calculated from the accumulationrate and the annihilation rate, the work- hardeningequation for a crystal is proposed. Using this equation,we develop a new meso-plasticity FEM that can take intoaccount effects of both plastic deformation and heattreatment on crystalline materials. Stretching andannealing processes of copper single crystal aresimulated by the FEM, and results show that the FEM cansimulate the effects of annealing on the mechanical properties appropriately.
展开▼
