A quasi-static full-field deformation measurement device and method for a slender member

A technology of slender components and measurement methods, applied in the direction of measuring devices, using optical devices, and using stable tension/pressure to test the strength of materials, etc., can solve the problems of quasi-static full-range deformation measurement of slender components and effective resolution in the width direction Reduce the problem of cumbersome image acquisition steps, etc., to achieve the effect of simple structure, improved measurement efficiency, and easy operation

Active Publication Date: 2021-04-13
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the actual engineering application process, in many cases, the size of the monitored object in a single direction is large, such as beams, columns and other slender members in civil engineering. When using DIC technology for strain analysis, if only the height direction of the image is considered size, the effective resolution in the width direction will be reduced; if only the size in the width direction of the image is considered, the highly efficient size will exceed the field of view of the camera, and the full-field measurement cannot be performed effectively. The quasi-static global deformation of the component is measured
For this reason, relevant researchers use multiple cameras to build a camera matrix to take pictures, but many cameras need to be used, the cost is high, the image acquisition steps are cumbersome, the efficiency is low, and it is inconvenient to use

Method used

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  • A quasi-static full-field deformation measurement device and method for a slender member
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  • A quasi-static full-field deformation measurement device and method for a slender member

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Embodiment approach

[0052] According to a preferred embodiment of the present invention, the camera mechanism 1 is a single industrial camera, which is fixedly connected with the driving mechanism 2 .

[0053] In a further preferred embodiment, the resolution of the camera mechanism 1 is 1280×1024.

[0054] Preferably, the industrial camera is preferably a MV-130UM series industrial camera made by Vision Intelligent, and its lens is preferably a Pentax TV LENS 16mm 1:1.4 industrial lens.

[0055] According to a preferred embodiment of the present invention, the drive mechanism 2 includes a drive motor 21 and a drive track 22 connected to each other, a slide table 23 is arranged on the drive track 22,

[0056] The camera mechanism 1 is fixedly connected to the slide table 23 .

[0057] In a further preferred embodiment, the driving track 22 is a lead screw, preferably a ball screw, which rotates under the drive of the drive motor to drive the slide table to move horizontally.

[0058] Preferably...

Embodiment 1

[0176] The selected elongated member is: a metal plate with a hole in the center, the length is 1m, the width is 5cm, and the height is 5cm.

[0177] The quasi-static full-field deformation measurement device for slender members is adopted, and the structure is as follows Figure 1~4As shown, wherein, the camera mechanism is a MV-130UM series industrial camera made by Weishizhi, and its lens is a Pentax TV LENS 16mm 1:1.4 industrial lens; the slide table is a single-axis slide table, which is controlled by a Siemens S7-200PLC controller .

[0178] Follow the steps below to measure:

[0179] Step 1: Obtain a panoramic image of the metal plate before it deforms.

[0180] Step 1-1: After the surface of the metal plate is polished, spray it flat with white paint as the bottom surface, and then spray black paint on the surface at a long distance to obtain the speckle size as 5 pixels.

[0181] Step 1-2, use the industrial camera to take the first image of the metal plate, after ...

Embodiment 2

[0191] For a point of x=25mm, y=150mm in the image stitched before deformation (the reference strain value obtained by ANSYS finite element analysis software is 9.528×10 -4 pixel), by changing different thresholds of gray-scale change density, the relative error of strain value and finite element parameter strain value and the statistical analysis results of the time to reach the threshold are obtained, as shown in Table 1:

[0192] Table 1

[0193]

[0194]

[0195] It can be seen from Table 1 that the larger the threshold value of the gray change density is set, the smaller the relative error is, and the higher the accuracy is, but at the same time, the longer the calculation time is, the lower the efficiency is; especially, when the threshold value is greater than 1.6, the accuracy does not increase much At the same time, the calculation time is significantly increased and the efficiency is reduced, so the threshold is preferably set to 1.6 in the present invention. ...

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Abstract

The invention discloses a quasi-static full-field deformation measuring device and method for a slender member. The device includes a camera mechanism (1) and a drive mechanism (2), wherein the camera mechanism (1) and the drive mechanism (2) are both Arranged in parallel with the elongated member (3), the camera mechanism (1) translates under the action of the driving mechanism (2) to collect images of the elongated member (3) at multiple positions, and then obtain the elongated member ( 3) panoramic image; the method includes collecting panoramic images of the elongated member before and after deformation, and comparing and analyzing to obtain the strain field of the elongated member. The measuring device of the invention has simple structure and low cost, and the method is easy to operate, has high image precision and high measuring efficiency.

Description

technical field [0001] The invention relates to the technical field of image acquisition of slender members, in particular to a device and method for quasi-static full-field deformation measurement of slender members. Background technique [0002] Digital image correlation (digital image correlation, DIC) technology was originally independently proposed by Peters of the University of South Carolina in the United States and Yamaguchi of Japan in the early 1980s. Non-contact optical method. DIC technology first uses digital imaging equipment (optical imaging, electronic imaging and scanning probe imaging equipment, etc.) Quantitatively calculate the full-field displacement and full-field strain of the measured object. [0003] In the actual engineering application process, in many cases, the size of a single direction of the monitored object is large, such as beams, columns and other slender members in civil engineering. When using DIC technology for strain analysis, if only...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16G01N3/08
CPCG01B11/16G01N3/08G01N2203/0075
Inventor 赵健付饶王羽张建忠王志奇
Owner BEIJING FORESTRY UNIVERSITY
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