CN-122024948-A - Inversion analysis method and device of material mechanics structure and electronic equipment

CN122024948ACN 122024948 ACN122024948 ACN 122024948ACN-122024948-A

Abstract

The invention relates to the technical field of mechanical property testing of a material micro-area, and discloses an inversion analysis method, a device and electronic equipment of a material mechanical structure, wherein the method comprises the steps of carrying out a nanoindentation test on a material to be tested to obtain an average load-depth curve; the method comprises the steps of extracting inversion input parameters based on an average load-depth curve, constructing a dimensionless function based on a dimensional analysis and characteristic strain method, fitting the dimensionless function, establishing a Ludwick constitutive inversion model, and solving to obtain mechanical constitutive parameters based on the inversion input parameters and Ludwick constitutive inversion model.

Inventors

YANG RIMING
HUANG XING
HE QI
LI WEI
ZHU LEI
WANG QIAN
HUANG JUNJIE
WU JICHANG

Assignees

中国航发湖南动力机械研究所

Dates

Publication Date: 20260512
Application Date: 20260112

Claims (10)

1. An inversion analysis method of a material mechanics principal structure, the method comprising: Carrying out nano indentation test on the material to be tested to obtain an average load-depth curve; Extracting inversion input parameters based on the average load-depth curve; Constructing a dimensionless function based on dimension analysis and a characteristic strain method, fitting the dimensionless function, and establishing Ludwick constitutive inversion model; And solving to obtain mechanical constitutive parameters based on the inversion input parameters and the Ludwick constitutive inversion model.
2. The inversion analysis method of a material mechanics mechanism according to claim 1, wherein the performing a nanoindentation test on the material to be tested to obtain a load-depth curve includes: preparing a material to be tested into a standard sample, and obtaining a change trend that the elastic modulus and the hardness are continuously increased along with a preset maximum indentation depth based on a nano indentation continuous stiffness method; selecting the corresponding maximum pressing load when the elastic modulus and the hardness are stable from the variation trend; and carrying out nano indentation test based on the maximum indentation load to obtain an average load-depth curve.
3. The inversion analysis method of a material mechanics principal structure according to claim 2, wherein performing a nanoindentation test based on a maximum indentation load to obtain an average load-depth curve includes: based on the maximum indentation load, adopting a conical pressure head to perform a nano indentation test in an array matrix indentation mode to obtain a plurality of initial load-depth curves, wherein the indentation interval is a preset multiple of a preset maximum indentation depth when the nano indentation test is performed; And after eliminating abnormal curves in the plurality of initial load-depth curves, carrying out averaging treatment on depth values of the rest initial load-depth curves under the same load to obtain an average load-depth curve.
4. The inversion analysis method of a material mechanics principal component according to claim 1, characterized in that extracting inversion input parameters based on the average load-depth curve includes: Calculating a reduced elastic modulus by adopting an elastic modulus and hardness analysis method based on the average load-depth curve, and extracting the indentation work and the actual maximum indentation depth; And taking the reduced elastic modulus, the indentation work and the actual maximum indentation depth as inversion input parameters.
5. The inversion analysis method of a material mechanics principal structure according to claim 1, wherein the constructing a dimensionless function based on the dimensional analysis and the characteristic strain method includes: Based on a preset hardening model, systematically combining a plurality of groups of preset material constitutive parameters, and carrying out nano indentation numerical simulation on each group of preset material constitutive parameters by adopting finite element software to obtain a simulation data set; based on the simulation data set, a dimensionless function is constructed by adopting a dimension analysis and characteristic strain method.
6. The inversion analysis method of the material mechanics principal component according to claim 5, wherein the step of performing nanoindentation numerical simulation on each set of preset material parameters by finite element software to obtain a simulation data set includes: Carrying out nano indentation numerical simulation on each group of preset material constitutive parameters by adopting finite element software to obtain a plurality of groups of simulation results, and extracting corresponding nano indentation response parameters from each group of simulation results; and correspondingly matching each group of preset material constitutive parameters with the nanoindentation response parameters to obtain a simulation data set.
7. The inversion analysis method of a material mechanics principal structure according to claim 5, wherein based on the simulation data set, a dimensionless function is constructed by using a dimension analysis and a feature strain method, comprising: Combining preset material constitutive parameters and nanoindentation response parameters in the simulation data set to form a plurality of dimensionless numbers; and introducing the characteristic strain and the characteristic stress as intermediate variables, taking the dimensionless number as a data point, and adopting a numerical fitting method to obtain a dimensionless function by fitting.
8. The inversion analysis method of a material mechanics primitive of claim 4, wherein solving to obtain a mechanics primitive parameter based on the inversion input parameter and the Ludwick primitive inversion model comprises: Substituting the reduced elastic modulus, the pressing work and the actual maximum pressing depth into the Ludwick constitutive inversion model to obtain mechanical constitutive parameters, wherein the mechanical constitutive parameters comprise yield strength, hardening index and hardening strength.
9. An inversion analysis device of a mechanics of materials architecture, the device comprising: the nanometer indentation test module is used for carrying out nanometer indentation test on the material to be tested to obtain an average load-depth curve; the inversion input parameter extraction module is used for extracting inversion input parameters based on the average load-depth curve; Ludwick the constitutive inversion model building module is used for building a dimensionless function based on dimension analysis and a characteristic strain method, fitting the dimensionless function and building a Ludwick constitutive inversion model; and the inversion analysis module is used for solving to obtain the mechanical constitutive parameters based on the inversion input parameters and the Ludwick constitutive inversion model.
10. An electronic device, comprising: A memory and a processor, the memory and the processor being communicatively connected to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the inversion analysis method of the mechanics of materials of any one of claims 1 to 8.

Description

Inversion analysis method and device of material mechanics structure and electronic equipment Technical Field The invention relates to the technical field of material micro-region mechanical property testing, in particular to an inversion analysis method and device of a material mechanical structure and electronic equipment. Background The Ti 2 AlNb alloy has the advantages of nickel-based superalloy heat strength and titanium alloy low density, and has wide application prospect in components such as an aeroengine high Wen Jixia. In actual processing, a welding process is often adopted to reduce the molding difficulty, but the welding-type casing has the problem of uneven microstructure and mechanical property of a welding joint, so that the reliability of the performances such as the elastic modulus, the strength and the like of the whole welding joint obtained by a traditional testing method (such as a uniaxial tensile test) is low, and the strength evaluation of the casing is influenced. Namely, for advanced alloys such as Ti 2 AlNb and the like, particularly welded joints thereof, the microstructure unevenness causes insufficient reliability of the traditional integral uniaxial tensile test result, and the micro-region performance cannot be represented. While nanoindentation technology is suitable for use in micro-area testing, inversion analysis presents challenges. However, the main current research focuses on Hollomon power law hardening models with few parameters (only 2), and complex materials (such as Ti 2 AlNb alloy) cannot be accurately described. Although individual researches try to invert Ludwick hardening models with more parameters (such as 3), the adopted method (such as based on spherical pressure head and needing a large number of data point fitting) has the defects of high experimental cost, complex flow, large inversion result error (> 15%), and difficult guarantee of uniqueness. Therefore, there is a need for an analytical method that can conveniently, accurately, and uniquely invert multiple plastic parameters of a hardening model of a material Ludwick. Disclosure of Invention The invention provides an inversion analysis method, an inversion analysis device and electronic equipment of a material mechanics structure, and aims to solve the problems that a Ludwick hardening model inversion method in the prior art is complex in process, large in inversion result error and difficult to obtain a plurality of plastic parameters. In a first aspect, the present invention provides a method for inversion analysis of a mechanical structure of a material, the method comprising: Carrying out nano indentation test on the material to be tested to obtain an average load-depth curve; extracting inversion input parameters based on the average load-depth curve; based on dimension analysis and a characteristic strain method, constructing a dimensionless function, fitting the dimensionless function, and establishing Ludwick constitutive inversion models; And solving to obtain the mechanical constitutive parameters based on the inversion input parameters and Ludwick constitutive inversion model. The inversion analysis method of the material mechanics principal structure, provided by the invention, constructs a closed dimensionless function system suitable for a three-parameter Ludwick hardening model by combining dimensional analysis and a characteristic strain method, can directly and uniquely invert a plurality of mechanical principal parameters of a material by only obtaining an average load-depth curve through a conventional nanoindentation test and extracting a few key response parameters, obviously reduces experimental complexity and cost while ensuring accuracy and uniqueness of inversion results, and solves the problems of complex process, large inversion result error and difficulty in obtaining a plurality of plastic parameters of the inversion method of the Ludwick hardening model in the prior art. In an alternative embodiment, the nano-indentation test is performed on the material to be tested to obtain a load-depth curve, including: preparing a material to be tested into a standard sample, and obtaining a change trend that the elastic modulus and the hardness are continuously increased along with a preset maximum indentation depth based on a nano indentation continuous stiffness method; Selecting the corresponding maximum pressing load when the elastic modulus and the hardness are stable from the variation trend; and carrying out nano indentation test based on the maximum indentation load to obtain an average load-depth curve. According to the inversion analysis method of the material mechanics structure, the test load is accurately determined through the continuous stiffness method, and the average load-depth curve is obtained based on the test load, so that stability and repeatability of a nano indentation test are remarkably improved, and reliability and representativeness of input data acco