Relaxation model of dynamic plastic deformation of materials

Abstract

Abstract.Mechanical model for plastic relaxation of stresses in metals has been proposed. Our approach based on a characteristic plastic relaxation time, which is assumed as a material parameter. In a number of tasks values of its parameter become similarly high and it leads to dynamic effect appearing even at low strain rates deformation condition. The phenomenon of yield drop is one of these manifestations. We also discuss a physically based assumption (in the frames of dislocation theory) for analytical form of relaxation time. We find that there are two different characteristic relaxation time parameters, which is playing a main role for different stages of plastic deformation in low defect crystals.

Comparative Analysis of Dynamic Plasticity Models

“…We see that the parameter  effects on the relaxation function (t). In initial formulation of the relaxation model of plasticity [42,53], acceptable region of the parameter  is from 0 to 1.…”

Прогнозирование Динамического Предела Текучести Металлов С Помощью Двух Структурно-Временных Параметров

“…Это возможно за счет внедрения в расчеты постоянного параметра инкубационного времени, учитывающего про-цессы релаксации напряжений при переходе на стадию пластического деформирования как временные и свя-занные с движением дефектов. Как было установлено ранее [1,17,18], параметр инкубационного времени теку-чести не зависит от механизма пластичности, а только от дефектной структуры материала.…”