A Study of Energy Balance in Deformed Metals for Assessment of Damage Accumulation Stage

Abstract

The work is devoted to study of energy balance in metals under plastic deformation and failure. Based on our previous experimental results we develop a phenomenological thermodynamic model of heat dissipation in metals. It allows us to simulate the energy balance under plastic deformation, to study the failure process of metals based on the stored energy criterion and the process of fatigue crack propagation. New internal thermodynamic variable is introduced as defect induced deformation and calculated based on the solution of statistical problem of mesodefect evolution. The developed model is adapted for using in standard final-elements numerical code (Abaqus) to simulate energy dissipation under quasi-static and cyclic loading in 3D geometries. The theoretical results were illustrated by computing of energy dissipation both under tensile test of Armco iron specimens and crack propagation under cyclic loading.