Effect of Temperature and Strain Amplitude on Fatigue Behaviour of BCC Iron Single Crystal using Molecular Dynamics Simulation

Abstract

Fatigue simulations on single crystal bcc iron have been carried out by using Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) package. Finnis-Sinclair potential suitable for bcc iron has been chosen to desc ibe the interatomic interactions. Fatigue simulation was carried out at 573 K by employing fully reversed, total strain controlled cycling at various strain amplitudes in the range of ± 7% to ± 10%. From the simulation results, effect of cyclic strain amplitude on cyclic stress response and cyclic stress-strain behaviour has been determined. The development of fatigue damage with successive number of cycles using Atom Eye software has been examined.