Method for realizing inversion identification of crystal plastic material parameters based on nanoindentation experiment

A technology of material parameters and nano-indentation, which is applied in the direction of applying stable tension/pressure to test material strength, analyze materials, and test material hardness. It can solve the problems of difficult material constitutive parameter identification and calculation result errors, and achieve calculation Effects of high convergence, improved precision, high practical value and reference significance

Active Publication Date: 2020-05-22
DALIAN UNIV OF TECH
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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 ca

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  • Method for realizing inversion identification of crystal plastic material parameters based on nanoindentation experiment
  • Method for realizing inversion identification of crystal plastic material parameters based on nanoindentation experiment
  • Method for realizing inversion identification of crystal plastic material parameters based on nanoindentation experiment

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with specific examples.

[0035] See attached figure 1 As shown, the specific implementation steps of the method for calibrating the microscopic constitutive parameters of metal materials based on nanoindentation and finite element simulation of crystal plastic material parameters include:

[0036] Step 1: Nanoindentation experiment of the metal material to be tested

[0037] 1-1: Select 304 stainless steel material as the test piece, cut the material, and use mechanical polishing and vibration polishing to obtain the nano-indentation test piece that meets the requirements;

[0038] 1-2: Use the nano-indentation xp system to carry out indentation test on the indentation specimen. In the test, the indentation depth was set to 2 microns, and the experimental indentation response including load-displacement curve, maximum load, contact stiffness and contact hardness was obtained. Repeat the test many t...

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Abstract

The invention belongs to the technical field of characterization of mechanical properties of materials, and provides a method for realizing inversion identification of crystal plastic material parameters based on a nanoindentation experiment. The method comprises the steps that firstly, the elasticity modulus of a material is obtained through an Oliver-Parr method; secondly, a piecewise linear/power law hardening material model is utilized to establish a nanoindentation macroscopic parameter inversion model by combining MATLAB and ABAQUS, the actual nanoindentation experimental data is corrected by utilizing accumulation/subsidence parameters, and the macroscopic constitutive parameters of the indentation material are calculated by combining a Kriging agent model and a genetic algorithm; and finally, a polycrystalline finite element model of the tensile test piece based on the crystal plasticity finite element is established by combining MATLAB and ABAQUS, and the parameters of the crystal plastic material are calculated according to the constitutive parameters of the material in combination with the Kriging agent model and the genetic algorithm. Compared with the prior art, the method has the advantages that the accuracy of calculation data can be improved, the calculation amount is remarkably reduced and the calculation convergence is improved, and the method has very high practical value and reference significance in inversion identification of the 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. important meaning. 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...

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Application Information

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IPC IPC(8): G01N3/08G01N1/32
CPCG01N3/08G01N1/32G01N3/42G01N2203/0218G01N2203/0286
Inventor 蒋玮李银银
Owner DALIAN UNIV OF TECH
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