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A Strain field subarea dynamic selection methodmethod for dynamically selecting strain field sub-region in digital image correlation method

A technology of digital image and correlation method, applied in the fields of fluid pressure measurement, electrical digital data processing, special data processing application using optical methods, etc., can solve problems such as unreasonable and loss of strain calculation accuracy

Inactive Publication Date: 2019-08-30
JIANGSU OPEN UNIV
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Problems solved by technology

It is very unreasonable to calculate the strain field by using the uniform size strain sub-region
The traditional method is to set the global sub-area close to the calculation lower limit, so as to effectively calculate the near-field data of the crack tip, but this also loses the strain calculation accuracy of the area far from the crack tip

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  • A Strain field subarea dynamic selection methodmethod for dynamically selecting strain field sub-region in digital image correlation method
  • A Strain field subarea dynamic selection methodmethod for dynamically selecting strain field sub-region in digital image correlation method
  • A Strain field subarea dynamic selection methodmethod for dynamically selecting strain field sub-region in digital image correlation method

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Embodiment Construction

[0066] The present invention is described in further detail now in conjunction with accompanying drawing.

[0067] figure 1 is a schematic diagram of the dynamic selection of the size of the strain field sub-region, which is represented by figure 1 It can be seen that a smaller strain calculation sub-area r should be selected in the larger deformation gradient region L , a larger strain calculation sub-area r should be selected in the area of ​​smaller deformation gradient S .

[0068] figure 2 It is a schematic diagram of the relationship between the local displacement field error and non-uniformity. The horizontal plane coordinates represent the scale of the grid nodes, and the vertical coordinates represent the displacement of the corresponding nodes. It can be seen from the figure that: (1) The displacement at the center of the sub-area is compared with the scale of the sub-area The displacement of the upper and lower edges should be small; (2) The displacement at the...

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Abstract

The invention discloses a strain field subarea dynamic selection method in a digital image correlation method, and provides evaluation parameters based on displacement field local gradient intensity for describing intensity of local non-uniform deformation. By balancing the noise intensity of the displacement field and the local non-uniform deformation intensity, a large strain calculation sub-region is selected at a place with relatively low non-uniform deformation gradient intensity, so that the noise of the displacement field is effectively suppressed; and a small strain calculation sub-region is selected in a place with relatively high non-uniform deformation gradient strength, so that the local deformation characteristic is reserved. And dynamic selection of the size of the strain field calculation subarea is realized, so that local deformation characteristics are reserved to the greatest extent while noise is effectively suppressed. The dynamic selection process of the size of the subarea based on the characteristics of the displacement field is different from the traditional dynamic selection process of calculating the size of the subarea based on the speckle gray level gradient information, and the measurement precision of the strain field of the digital image correlation method in the non-uniform deformation can be effectively improved.

Description

technical field [0001] The invention belongs to the field of digital image processing, in particular to a method for dynamically selecting strain field sub-regions in a digital image correlation method. Background technique [0002] Digital Image Correlation (DIC) is based on digital image processing technology. It is an advanced modern photomechanical method and belongs to the frontier category of experimental mechanics. With the continuous improvement of industrial camera manufacturing technology and computer processing performance in recent years, DIC technology has gradually been applied and practiced in many testing fields due to its advantages such as non-contact, natural light source, and full-field measurement. In addition to its application in traditional structure and material mechanical performance testing, it has unprecedented problem-solving capabilities in the fields of micro-nano electronic systems and biomechanics. [0003] Many factors affecting the measure...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/32G06F17/50G01L11/02G01L1/24G01B11/16
CPCG01L1/24G01L11/02G01B11/16G06V10/25G06F30/20
Inventor 顾筠林小宁黄黎周海峰
Owner JIANGSU OPEN UNIV
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