A realization method of inversion and identification of crystal plastic material parameters based on nanoindentation experiment

Abstract

The invention belongs to the technical field of characterization of mechanical properties of materials, and provides a method for realizing parameter inversion identification of crystal plastic materials based on nano-indentation experiments. In this method, firstly, the Oliver-Pharr method is used to obtain the elastic modulus of the material; secondly, the piecewise linear / power law hardening material model is used, combined with MATLAB and ABAQUS to establish a nanoindentation macro parameter inversion model, and the accumulation / sinking parameters are used to analyze the actual The nano-indentation experimental data is corrected, and the macro-constitutive parameters of the indented material are calculated by combining the Kriging proxy model and the genetic algorithm; finally, the polycrystalline finite element model of the tensile specimen based on the crystal plastic finite element is established by combining MATLAB and ABAQUS, according to The obtained material constitutive parameters are combined with the Kriging surrogate model and the genetic algorithm to calculate the crystal plastic material parameters. Compared with the prior art, the present invention can improve the accuracy of calculation data, significantly reduce the amount of calculation, and improve the convergence of calculation, and has high practical value and reference significance in the inversion identification of crystal plastic material parameters.

Description

technical field [0001] The invention belongs to the technical field of characterization of mechanical properties of materials, and relates to a method for inverting and calibrating microscopic constitutive parameters of metal materials based on nano-indentation experiments of crystal plastic material parameters. Background technique [0002] The mesoscopic mechanical behavior of materials directly affects the strength and other macroscopic mechanical properties of materials. Studying the mechanical behavior of materials from the mesoscopic scale is helpful to deepen the understanding of the mechanism of material deformation and damage, and has a positive impact on the use and performance improvement of materials. Significance. In the study of mesomechanics, the strengthening of crystalline materials is an important part of the elastic-plastic constitutive description of crystalline materials. A simple form of the crystal slip hardening modulus was proposed by Peirce et al. ...

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Problems solved by technology

However, when there is no accurate load-displacement (indentation depth) curve, there may be large errors in the calculation results, so it is difficult to quickly and accurately identify the constitutive parameters of the material

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