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Constitutive model of welded joints based on nanoindentation test

A technology of welded joints and constitutive models, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of difficult sampling of joint micro-areas and high test costs

Active Publication Date: 2019-02-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0006] 1. For some welded joints with small micro-areas, it is still very difficult to sample in the micro-areas of the joints;
[0007] 2. The test cost is high

Method used

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  • Constitutive model of welded joints based on nanoindentation test
  • Constitutive model of welded joints based on nanoindentation test
  • Constitutive model of welded joints based on nanoindentation test

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Embodiment Construction

[0054] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0055] Such as figure 1 As shown, a method for inversion of constitutive model of welded joints based on nanoindentation test, including the following steps:

[0056] Step 1: Determine the constitutive model that the welded joint conforms to, and construct the mathematical expression of the constitutive model expressed by the mechanical property parameters of the material;

[0057] Step 2: Use the π theorem to conduct a dimensional analysis on the process of the indenter pressing into the surface of the welded joint, and derive the dimensionless π function relationship between the basic mechanical property parameters of the material during the loading / unloading process and the indenter pressing process parameters;

[0058]...

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Abstract

The invention provides a method for backward deducing a constitutive model of a welding joint based on a nanoindentation test, comprising the following steps: step 1, constructing a constitutive modelof the welding joint; 2, carry out dimensional analysis to obtain a dimensionless function between stress and strain; 3, selecting that material satisfying the constitutive relation of the step 1, and carry out finite element simulation on the process of pressing the indenter into the material; 4, determining the selected material and the corresponding stress and strain, substituting the selectedmaterial into a dimensionless function, and determining the function value corresponding to each material; 5, fitting the obtained mechanical property parameter and the function value to obtain the expression of the dimensionless function; 6, perform nano indentation test on that weld joint to obtain the mechanical property parameters of the weld joint; Step 7: The constitutive model of the welded joint is deduced backwards by using the mechanical property parameters. The invention provides a reverse inference method for welding joint constitutive model based on nano-indentation test, which has the advantages of wide applicability, low cost and high accuracy.

Description

technical field [0001] The invention relates to the technical field of testing methods for the mechanical properties of metal materials, in particular to a method for inverting constitutive models of welded joints based on nano-indentation tests. Background technique [0002] The process characteristics of metal welding and forming determine that the mechanical properties of materials in different regions of the welded joint are non-uniform. Obtaining the constitutive relationship of each region of the heterogeneous material is one of the important prerequisites for analyzing its failure behavior. [0003] At present, most of the research on the constitutive model of welded joints is carried out in accordance with the national standard, taking standard samples perpendicular to the welding direction. Conventional methods can obtain relevant parameters such as elastic modulus, yield strength, and tensile strength of welded joints in the "average" sense, but cannot reflect the ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 刘小刚朱笑林杨磊郭海丁
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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