Method for achieving plasticity parameter parametric inversion recognition of welding nuclear area material

A technology of plastic parameters and regions, applied in the direction of analyzing materials, testing the hardness of materials, and testing the strength of materials by applying stable tension/pressure. The effect of improving efficiency

Inactive Publication Date: 2017-11-03
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Due to size factors, it cannot be obtained experimentally

Method used

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  • Method for achieving plasticity parameter parametric inversion recognition of welding nuclear area material
  • Method for achieving plasticity parameter parametric inversion recognition of welding nuclear area material
  • Method for achieving plasticity parameter parametric inversion recognition of welding nuclear area material

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Embodiment Construction

[0035] Such as figure 1 As shown, this embodiment includes the following steps:

[0036] Step 1, design the sample and carry out the Vickers hardness test: the test material selected in this embodiment is 304l stainless steel, and the designed hardness sample is as follows figure 2shown. In the hardness test, the variation range of the test load is 0.025-0.5kgf, four tests are carried out under each load and the diagonal length of the obtained indentation is measured. The relationship between the load and the diagonal length is shown in Table 1:

[0037] Table 1 304l stainless steel force-diagonal length measurement results

[0038]

[0039] Step 2. Convert the diagonal length of the indentation into the indentation depth: convert the diagonal length value in Table 1 into the indentation depth, and the obtained force-depth relationship data is shown in Table 2:

[0040] Table 2 304l stainless steel force-depth relationship data

[0041]

[0042] image 3 To draw th...

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Abstract

The invention discloses a method for achieving plasticity parameter parametric inversion recognition of a welding nuclear area material. The method comprises the following steps: testing the Vickers hardness of a material to be tested so as to obtain force-depth data, establishing a fitness optimization function, performing parameter optimization on a particle group algorithm according to the fitness optimization function, and performing recognition by using the optimized particle group algorithm, thereby obtaining optimal fitting plasticity parameters of the material to be tested. By adopting the method, the recognition precision and efficiency of plasticity parameters of materials can be remarkably improved, and a foundation can be made for improving the CAE (Computer Aided Engineering) simulation precision of a welding point structure.

Description

technical field [0001] The invention relates to a technology in the field of welding, in particular to a method for realizing the inversion identification of the plastic parameter of a weld nugget area based on a particle swarm algorithm and a hardness test. Background technique [0002] The plastic parameters such as the yield strength of the material in the weld nugget area must be input during the CAE modeling of the weld joint structure, which has a great impact on the simulation accuracy. Affected by size factors, it cannot be obtained by making samples and performing uniaxial tensile tests. [0003] According to the obvious difference in material properties, the resistance spot welding joint structure can be divided into three areas: the base metal area, the heat-affected area, and the weld nugget area. It was found that the area of ​​the heat-affected zone was small compared with the base metal zone and the weld nugget zone. When the finite element model is establis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/42
CPCG01N3/08G01N3/42G01N2203/0017G01N2203/0075G01N2203/0078G01N2203/0252G01N2203/0296
Inventor 刘钊朱平秦兴元
Owner SHANGHAI JIAO TONG UNIV
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