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Single-axis test automatic strain measuring device and method based on computer vision

A computer vision, uniaxial test technology, applied in the field of geotechnical engineering, can solve the problems of less research on the influence of correction area, lack of testing equipment for testing unconfined strength radial strain, etc., to achieve low environmental requirements and improve measurement speed The effect with precision and simple light path

Pending Publication Date: 2019-02-05
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on the influence of the corrected area
At the same time, there is a lack of test equipment for testing the radial strain of the unconfined strength.

Method used

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  • Single-axis test automatic strain measuring device and method based on computer vision
  • Single-axis test automatic strain measuring device and method based on computer vision
  • Single-axis test automatic strain measuring device and method based on computer vision

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Embodiment Construction

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0031] Such as Figure 1-3 As shown, the embodiment of the present invention discloses a computer vision-based uniaxial test automatic strain measurement device, including a loading device 21, a sample box 2, an acquisition device 23, and a support device 24, and the loading device 21 includes an upper platen 1, the lower platen 20, the acquisition device 23 includes a load cell 5, a displacement sensor 7, a video camera 8, a light source 9, a data recorder 10 and a computer 11, and the support device 24 includes a first pillar 3, a base plate 4, a frame 6. Workbench 12 , bracket 13 , column 19 , second support 25 , third support 30 and connecting column 31 .

[0032] The workbench 12 is placed on a fixed operating plane, and a drive mechanism 22 is arr...

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Abstract

The invention discloses a single-axis test automatic strain measuring device and a method based on computer vision. The device comprises a sample box, an upper pressing plate, a lower pressing plate,a weighing sensor, a displacement sensor, a camera, a light source, a data recorder, a computer, a first support column, a bottom plate, a frame, a working table, a support, a column body, a second support column, a third support column and a connecting column. A driving mechanism is arranged in the working table. The upper pressing plate is connected with the weighing sensor through the connecting column. The lower pressing plate is fixedly connected with the bottom plate. The sample box is arranged between the upper pressing plate and the lower pressing plate. Samples are placed in the sample box. The driving mechanism drives the second support column to perform a vertical lifting motion, so as to drive the lower pressing plate to conduct an uniaxial compression test on the sample in thesample box. According to the single-axis test automatic strain measuring device and the method based on computer vision, the axial strain and the radial strain in an unconfined compression test can be rapidly and accurately measured, and processing is performed in real time, so that a better test means is provided for evaluating the strain characteristic of the unconfined compression strength ina geotechnical engineering.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to an automatic strain measurement device and method for a uniaxial test based on computer vision. Background technique [0002] The strain measurement in the general unconfined compression test often uses a strain-controlled unconfined compressometer, which is a contact measurement method. In the process of compression deformation, the friction between the end of the sample and the pressure plate will produce Relative movement will inevitably produce measurement errors. In addition, the traditional unconfined compression test strain contact measurement method has defects such as large measurement error, cumbersome operation, inability to measure the whole process of compression deformation, and large workload, which limits its use in many fields and occasions. [0003] At the same time, the most significant uncertainty in the unconfined compression test is the cha...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01B11/16
CPCG01B11/16G01N3/08G01N2203/0252G01N2203/0682
Inventor 刘罗基段隆臣张涛
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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