Numerical Analysis of the Influence of Residual Stress and Grain Size on the Indentation Behavior of Beryllium
Information on the micromechanical behavior(properties)of beryllium metal surfaces at the grain scale were obtained by using nanoidentation and electron backscattered diffraction(EBSD)techniques,and finite element simulations of the nanoindentation process were conducted using ABAQUS software.As the numerical simulation results were consistent with the measured data,fundamental mechanical property parameters of the simulation process could be obtained.Based on these parameters,a numerical analysis was performed to investigate the effects of residual stress and grain size on the nanoindentation behavior of beryllium.The results indicated a clear linear relationship between residual stress,crystal size,and the plastic work of nanoindentation,maximum depth,and residual depth.When considering plastic work for comparison,the influence coefficient of residual stress was found to be 0.852 5×10-12 J/MPa,and the influence coefficient of grain size was 95.373×10-12 J/μm.This study provides valuable insights for the understanding of mechanical properties in nanoindentation and for estimating residual stress within grains.
metal berylliumnanoindentationfinite element methodresidual stressgrain size
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