https://doi.org/10.1051/epjconf/20159404039
Relaxation model for dynamic plastic deformation of materials
1 IPME RAS, Extreme States Dynamics Department, V.O., 199178 Bolshoj pr., 61 St. Petersburg, Russia
2 Saint Petersburg State University, 7/9, 199034, Universitetskaya nab., St. Petersburg, Russia
3 Chelyabinsk State University, 454001 Br. Kashirinykh, 129, Russia
4 University of Applied Sciences of Southern Switzerland, DynaMatLab, 6952 Canobbio, Switzerland
a Corresponding author: elbor7@gmail.com
Published online: 7 September 2015
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.
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