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CN-224231539-U - Standard device for DIC system calibration

CN224231539UCN 224231539 UCN224231539 UCN 224231539UCN-224231539-U

Abstract

The utility model provides a standard device for calibrating a DIC system, which comprises a base, a driving device and a sample to be tested, wherein the driving device is fixed on the back surface of the base, the output end of the driving device penetrates to the front surface of the base, the edge of the front surface of the base is vertically provided with a clamping arm, the clamping arm is provided with a clamping part for clamping the edge of the sample to be tested, and the output end abuts against the back surface of the sample to be tested and pushes the sample to be tested to deform. The standard device provided by the utility model can be used for rapidly and nondestructively fixing a sample to be tested by combining the clamping arm with various clamping parts, simulating working conditions under different force application modes and meeting diversified test requirements.

Inventors

  • ZHENG WEIFENG
  • Yu Haini
  • ShangGuan Ronghai
  • CHEN Jin
  • ZHENG PENG
  • Zheng Shangbang
  • HUANG WEIPING

Assignees

  • 厦门市计量检定测试院

Dates

Publication Date
20260512
Application Date
20250520

Claims (10)

  1. 1. The standard device for the DIC system calibration is characterized by comprising a base, a driving device and a sample to be tested, wherein the driving device is fixed on the back surface of the base, an output end of the driving device penetrates to the front surface of the base, a clamping arm is vertically arranged on the edge of the front surface of the base, the clamping arm is provided with a clamping part for clamping the edge of the sample to be tested, and the output end abuts against the back surface of the sample to be tested and pushes the sample to be tested to deform.
  2. 2. The device of claim 1, wherein the clamping arms are symmetrically disposed on the upper and lower sides of the front surface of the base, and the output end penetrates through the middle of the base and abuts against the center of the back surface of the sample to be tested.
  3. 3. The device according to claim 2, wherein the output end is detachably provided with a force transmission piece, the force transmission piece comprises a base and a force transmission arm, the center of the back of the base is connected with the output end, and the force transmission piece is vertically arranged on the front of the base and symmetrically distributed on the upper edge and the lower edge of the base.
  4. 4. The device of claim 1, wherein the clamping arm is disposed at a lower edge of the front face of the base, and the output end abuts against an upper portion of the back face of the sample to be tested.
  5. 5. The device according to claim 1, wherein the clamping portion is a clamping groove formed in the middle of the clamping arm, and the width of the clamping groove is adapted to the thickness of the sample to be tested.
  6. 6. The device of claim 1, wherein the gripping portion is a jaw disposed at an end of the gripping arm.
  7. 7. The device of claim 1, wherein the front face of the base is further provided with an up-and-down guided size adjustment mechanism, and the clamping arm is slidably connected to the size adjustment mechanism.
  8. 8. The device of claim 7, wherein the size adjustment mechanism comprises a slide rail and a slider, a back of the slide rail being coupled to the front of the base, the clamp arm being engaged with the slider and sliding along the slide rail.
  9. 9. The device of claim 1, wherein the drive means is a tubular linear motor.
  10. 10. The device of claim 1, further comprising a strain gauge attached to the front surface of the sample to be tested, the strain gauge being connected to the strain gauge by a wire.

Description

Standard device for DIC system calibration Technical Field The utility model relates to the field of mechanical measurement calibration, in particular to a standard device for DIC system calibration. Background Digital Image Correlation (DIC) technology is widely applied to the fields of material mechanical property test, structural deformation analysis and the like by virtue of non-contact and full-field measurement. However, the measurement accuracy of the DIC system depends on the reliability of the calibration process, and the conventional calibration device has certain limitations in terms of sample fixation, load application and data reference acquisition, such as easy edge extrusion damage or unstable fixation of a flexible screen, an ultrathin device and other samples to be tested, influence the test consistency, difficulty in simulating complicated three-point bending, four-point bending or cantilever stress states in actual working conditions by a single force application structure, insufficient calibration coverage scenes, frequent replacement of special fixtures or devices for samples with different sizes, poor universality, lack of a high-accuracy real-time strain acquisition means, difficulty in ensuring the accuracy and the integrity of calibration reference data, and restriction of application and popularization of the DIC system in precise measurement. Aiming at the problems, the application provides a standard device for calibrating a DIC system, which can realize accurate calibration of the DIC system by designing a clamping structure, a diversified force application mode and a high-precision strain detection module which can be adapted to different samples, and effectively improve the measurement reliability and applicability. Disclosure of utility model Aiming at the problems in the prior art, the utility model provides a standard device for the calibration of a DIC system, which is used for solving the problems. The application provides a standard device for calibrating a DIC system, which comprises a base, a driving device and a sample to be tested, wherein the driving device is fixed on the back surface of the base, the output end of the driving device penetrates to the front surface of the base, the edge of the front surface of the base is vertically provided with a clamping arm, the clamping arm is provided with a clamping part for clamping the edge of the sample to be tested, and the output end abuts against the back surface of the sample to be tested and pushes the sample to be tested to deform. Through adopting above-mentioned technical scheme, utilize clamping part to fix the edge of sample that awaits measuring, and then promote the sample that awaits measuring from the back to the front direction by drive arrangement's output, make its take place deformation, and then measure the produced stress through other strain detection device, further measure the sample that awaits measuring that takes place deformation by the DIC system, regard the stress value that standard device measured as the benchmark, if the two result equals, then need not calibrate, otherwise need calibrate. Preferably, the clamping arms are symmetrically arranged on the upper side and the lower side of the front face of the base, and the output end penetrates through the middle of the base and props against the center of the back face of the sample to be tested. Through adopting above-mentioned technical scheme, the back center of output promotion sample to be measured carries out protruding deformation to the front direction, cooperates with upper and lower both sides centre gripping arm and constitutes three-point deformation, and the stress state of sample in the practical application scene can be accurately simulated to the three-point stress structure of symmetry, is convenient for gather data such as the deformation volume, the stress distribution of sample surface each point in real time through strain detection device. Further preferably, the output end is detachably provided with a force transmission piece, the force transmission piece comprises a base and a force transmission arm, the center of the back of the base is connected with the output end, the force transmission piece is vertically arranged on the front of the base, and the force transmission piece is symmetrically distributed on the upper edge and the lower edge of the base. Through adopting above-mentioned technical scheme, additionally install the biography power spare on the output, utilize the biography power arm of upper and lower symmetry to join in marriage the centre gripping arm of upper and lower symmetry, when the output promotes the sample that awaits measuring to the front direction, two biography power arms promote the sample that awaits measuring to the front protrusion deformation, constitute four-point deformation with the centre gripping arm, four-point deformation structure compares in three-point structure, can simulat