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Journal of Applied Mechanics and Technical Physics

2019 year, number 4

Numerical Study of Stress Relaxation in Nanostructures in the Course of Uniaxial Straining

I. F. Golovnev1, E. I. Golovnevaa1, M. S. Voronin2,3, E. R. Pruuel2
1Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia
2Lavrentyev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia
3Novosibirsk State Technical University, Novosibirsk, 630087, Russia
Keywords: метод молекулярной динамики, релаксация напряжения, наноразмерный стержень, дефекты кристаллической решетки, носитель необратимой деформации, molecular dynamics method, stress relaxation, nano-sized rod, crystal lattice defects, carrier of irreversible deformation


Stress relaxation in a nano-sized rod containing structural defects in the course of constant-rate uniaxial straining is studied, and the reasons for the onset of this phenomenon are determined. Under the assumption that structural defects can serve as carriers of irreversible deformation of a higher level than dislocations, the problem is solved by the molecular dynamics method. It is found that stress relaxation is accompanied by the transition of the entire system to a steady state with a deeper potential minimum as compared to the system energy before the stress relaxation process, resulting in a temperature increase and reduction of the strain tensor components.