IMPLEMENTATION METHOD FOR CRYSTAL PLASTIC MATERIAL PARAMETER INVERSION IDENTIFICATION BASED ON NANO-INDENTATION EXPERIMENT

摘要

An implementation method for crystal plastic material parameter inversion identification based on a nano-indentation experiment, relating to the technical field of material mechanical property characterization. The method comprises: first, obtaining a modulus of elasticity of a material by using an Oliver-Pharr method; next, establishing a nano-indentation macroscopic parameter inversion model by using a piecewise linear/power law hardening material model in combination with MATLAB and ABAQUS, correcting actual nano-indentation experiment data by using a stacking/subsidence parameter, and calculating macro constitutive parameters of the indentation material by combining a Kriging agent model and a genetic algorithm; and finally, building a multi-crystal finite element model of a tensile test piece based on a crystal plasticity finite element by combining MATLAB and ABAQUS, and calculating crystal plastic material parameters according to the obtained constitutive parameters of the material in combination with the Kriging agent model and the genetic algorithm. The method can improve the accuracy of calculation data, significantly reduce the calculation amount, and improve calculation convergence, and has high practical value and reference significance in the crystal plastic material parameter inversion identification.