Multi-parameter inversion method and device for heterogeneous materials based on automatic image partitioning

An automatic partitioning and heterogeneous technology, applied in the field of multi-parameter inversion of heterogeneous materials, can solve the problems of manual partitioning, insufficient material parameters, complex experimental process, etc., and achieve the effect of improving accuracy and simplifying the measurement process

Active Publication Date: 2022-05-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing methods for the measurement of heterogeneous material parameters have complex experimental procedures, manual partitioning is required, the obtained material parameters are not comprehensive enough, and the accuracy is low due to the use of only one time displacement field deformation information.

Method used

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  • Multi-parameter inversion method and device for heterogeneous materials based on automatic image partitioning
  • Multi-parameter inversion method and device for heterogeneous materials based on automatic image partitioning
  • Multi-parameter inversion method and device for heterogeneous materials based on automatic image partitioning

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Effect test

Embodiment 1

[0078] Combine the following figure 1 A specific embodiment of the multi-parameter inversion method for heterogeneous materials based on automatic image partitioning described in the present invention is described, including:

[0079] S11: making a speckle test piece, where the speckle test piece includes speckle marking points;

[0080] S12: Fix the speckle specimen on the testing machine, collect the original speckle image of the speckle specimen before deformation, apply the first load to the speckle specimen through the testing machine, and collect the deformation of the speckle specimen in the elastic-plastic section M first speckle images in the process, the elastic-plastic segment includes an elastic phase and a plastic phase, and M is a positive integer;

[0081]When the external force is less than the elastic limit load, after the external force causing the deformation is removed, the specimen can completely restore its original shape. This recoverable deformation is...

Embodiment 2

[0097] The following combination figure 2 Another specific embodiment of the multi-parameter inversion method for heterogeneous materials based on automatic image partitioning described in the present invention is described, including:

[0098] S21: making a speckle test piece, where the speckle test piece includes speckle marking points;

[0099] In step S21, the speckle specimen is made in the following manner:

[0100] Spray white paint evenly on the piece to be tested as a white base, wait for the white paint to dry and form a film, and use black paint to evenly spray black speckles on the white base.

[0101] S22: Fix the speckle test piece on the testing machine, collect the original speckle image of the speckle test piece before deformation, apply the first load to the speckle test piece through the testing machine, and collect the deformation of the speckle test piece in the elastic-plastic section M first speckle images in the process, the elastic-plastic segment i...

Embodiment 3

[0178] This is a specific embodiment of the heterogeneous material multi-parameter inversion device based on automatic image partitioning described in the present invention, including:

[0179] The image acquisition module 301, the image acquisition module 301 is coupled with the displacement field calculation module 302, and is used to acquire the original speckle image of the speckle specimen before deformation and to acquire M images of the speckle specimen during the deformation process in the elastic-plastic section The first speckle image is transmitted to the displacement field calculation module 302, where M is a positive integer;

[0180] The displacement field calculation module 302 is coupled to the image acquisition module 301 and the range selection module 303 respectively, and is used to calculate the displacement field of the speckle specimen during the deformation process according to the original speckle image and the M first speckle images, Eliminate rigid bo...

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Abstract

The invention discloses a heterogeneous material multi-parameter inversion method and device based on automatic image partitioning. The method includes: making a speckle test piece, fixing the speckle test piece on a testing machine, collecting the original speckle image, and passing the test The machine applies the first load to the speckle specimen, collects M first speckle images; calculates the displacement field, excludes rigid body translation and rigid body rotation, and obtains M corrected second speckle images; on the original speckle image Select the range to be measured; calculate the strain gradient according to the displacement field, automatically divide the range to be measured into the first area to the Nth area, and calculate the elastic-plastic constitutive parameters of the first area to the Nth area respectively. The area to be tested can be automatically divided into multiple areas by calculating the strain gradient, which can automatically complete the area division of the area to be tested in one loading experiment, without the need for manual division by hardness testing and other methods before the loading test, simplifying the elasticity of heterogeneous materials. The process of plastic constitutive parameter measurement.

Description

technical field [0001] The invention relates to the technical field of optical measurement in experimental mechanics, more specifically, to a multi-parameter inversion method and device for heterogeneous materials based on automatic image partitioning. Background technique [0002] In the classical parameter inversion method, the specimen is usually a homogeneous material, that is, the material parameters in all regions of the specimen to be tested are consistent. However, in practical applications, there may be differences in the material properties of different regions of the specimen, such as welding materials. At present, the patent application publication number CN102778403A proposes a method for identifying weld material parameters. This method first needs to partition the material according to the results of the hardness test, and then conduct a tensile test, and use digital image correlation technology equipment to obtain each area of ​​the tensile test piece. Real-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/06G01B11/16G06T3/00
CPCG01N3/08G01N3/068G01B11/167G06T3/0006G01N2203/0003G01N2203/0075G01N2203/0647G01N2203/0682G06T2210/44
Inventor 刘战伟李伊炀赵家业周江帆吴东亮刘胜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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