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Clamp device for in-board strain DIC measurement of plate

A fixture device and plate technology, which can be used in measuring devices, workpiece clamping devices, optical devices, etc., can solve problems such as difficulty in adjusting the normal clamping force, poor accuracy, and poor measurement accuracy.

Pending Publication Date: 2021-07-06
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the front of the sample is blocked, the strain in the length and thickness directions of the sample can only be measured from the side. The strain in the thickness direction is small and the measurement accuracy is poor, while the strain in the width direction can only be calculated using the principle of volume invariance. poor
The lateral and normal directions of the traditional compression-shear test specimen are blocked at the same time, and the shear strain cannot be measured
The normal force exerted by traditional clamping devices is fixed, and it is difficult to independently adjust the normal clamping force according to the sample material and actual needs

Method used

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  • Clamp device for in-board strain DIC measurement of plate
  • Clamp device for in-board strain DIC measurement of plate
  • Clamp device for in-board strain DIC measurement of plate

Examples

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Embodiment Construction

[0022] Such as figure 1 and figure 2 As shown, this embodiment includes: a force-adjusting splint mechanism A with a visible window, a position-adjusting splint mechanism B and a clamping handle mechanism C, wherein: the position-adjusting splint mechanism B is arranged at both ends of the force-adjusting splint mechanism A, The clamping handle mechanism C is set at both ends of the positioning splint mechanism B, and the three are fixed in turn to prevent the sample D from bending in the normal direction.

[0023] Such as image 3 and Figure 4 As shown, the force-adjusting splint mechanism A includes: an upper splint 1, a lower splint 2, a transparent splint 3, a first bolt 5 with a spring 4 and a nut 6, wherein: the transparent splint 3 is embedded in the upper splint by screws 7 In the visible window of 1, between the upper splint 1 and the lower splint 2, the pressing force is adjusted by the cooperation of the first bolt 5 with the spring 4 and the nut 6.

[0024] T...

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Abstract

A clamp device for in-board strain DIC measurement of a plate comprises a force adjusting clamping plate mechanism with a visible window, position adjusting clamping plate mechanisms and clamping handle mechanisms, the position adjusting clamping plate mechanisms are arranged at the two ends of the force adjusting clamping plate mechanism, the clamping handle mechanisms are arranged at the two ends of the position adjusting clamping plate mechanism, and the force adjusting clamping plate mechanism, the position adjusting clamping plate mechanisms and the clamping handle mechanisms are sequentially fixed to prevent the plate from being bent in the normal direction; and according to the invention, the visualization of the front surface of the sample is ensured while pressure is applied to the front surface of the sample, the pressure value is adjusted, and the two-way strain can be measured by adopting a DIC. In addition, a movable clamp and a movable clamping handle are arranged to measure a stress-strain curve of a tension-compression cycle.

Description

technical field [0001] The invention relates to a technique in the field of testing the mechanical properties of metal plates, in particular to a fixture device for DIC measurement of strain in the plate surface. Background technique [0002] When conducting compression experiments to study the anisotropy of plates, hydraulic and pneumatically driven structures are usually used to apply pressure to restrain normal bending. Since the front of the sample is blocked, the strain in the length and thickness directions of the sample can only be measured from the side. The strain in the thickness direction is small and the measurement accuracy is poor, while the strain in the width direction can only be calculated using the principle of volume invariance. poor. In traditional compression-shear experiments, the lateral and normal directions of the sample are blocked at the same time, so the shear strain cannot be measured. The normal force exerted by traditional clamping devices i...

Claims

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Application Information

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IPC IPC(8): G01N3/04G01N3/08G01N3/06G01B11/16B25B11/00
CPCG01N3/04G01N3/06G01N3/08G01B11/16B25B11/00G01N2203/0085G01N2203/0075G01N2203/0282G01N2203/04G01N2203/0641G01N2203/0682
Inventor 董湘怀杨作坤
Owner SHANGHAI JIAO TONG UNIV
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