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Inversion Method of Constitutive Model of Welded Joint Based on Nanoindentation Test

A technology for welded joints and constitutive models, which is applied in instrumentation, geometric CAD, design optimization/simulation, etc., can solve the problems of difficult sampling of joint micro-areas and high test costs, achieve high expression accuracy, simple form, and save test costs. Effect

Active Publication Date: 2021-07-23
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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  • Inversion Method of Constitutive Model of Welded Joint Based on Nanoindentation Test
  • Inversion Method of Constitutive Model of Welded Joint Based on Nanoindentation Test
  • Inversion Method of Constitutive Model of Welded Joint 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] like 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] S...

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Abstract

The invention provides a method for inverting the constitutive model of the welded joint based on the nano-indentation test, which includes the following steps: Step 1: constructing the constitutive model of the welded joint; Step 2: performing dimensional analysis to obtain the infinite relationship between stress and strain step 3: select the material that satisfies the constitutive relationship in step 1, and perform finite element simulation on the process of the indenter pressing into the material; step 4: determine the selected material and the corresponding stress and strain, and substitute it into the dimensionless function to determine and The function value corresponding to each material; Step 5: Fit the obtained mechanical property parameters with the function value to obtain the expression of the dimensionless function; Step 6: Conduct a nano-indentation test on the welded joint to solve the mechanical properties of the welded joint Parameters; Step 7: Invert the constitutive model of the welded joint by using the mechanical properties parameters. The method for inverting the constitutive model of the welded joint based on the nano-indentation test provided by the present invention has the advantages of wide applicability, reduced 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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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F30/17G06F119/14
CPCG06F30/23
Inventor 刘小刚朱笑林杨磊郭海丁
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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