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Strain test sensing element with matched modulus and manufacturing method thereof

A technology for sensing elements and strain testing, applied in electromagnetic measurement devices, electrical/magnetic solid deformation measurement, etc., can solve problems such as limiting the scope of use, and achieve the effects of high sensitivity, large strain range, and guaranteed test accuracy.

Inactive Publication Date: 2015-09-16
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the material of the polyimide base, this strain gauge is more suitable for strain testing of materials with a larger modulus, which limits its application range and cannot effectively measure plastics, rubber and other materials with a smaller modulus. Strain testing of materials such as soil

Method used

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  • Strain test sensing element with matched modulus and manufacturing method thereof

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Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: as figure 1 As shown, a modulus matching strain test sensing element of the present invention is in the shape of a strip, which includes a thin plate 1 in the lower layer, a sensitive film 2 in the middle layer, electrodes 3 and an insulating protective film 4 in the upper layer. The object of the strain test is concrete structure, and the epoxy resin sheet with smaller elastic modulus is selected as the lower sheet 1, the thickness of the sheet 1 is 0.3mm, the length is 50mm, and the width is 10mm. The sensitive film 2 of the middle layer is made of epoxy resin as the matrix and conductive carbon black as the filling material, which is prepared into a conductive polymer composite material, and then printed on the thin plate 1; before printing, the upper surface of the thin plate 1 is wiped clean with a solvent to ensure that the printing Effect. The electrodes 3 of the middle layer are printed on the thin plate 1 using commercially available printable co...

Embodiment 2

[0024] Embodiment 2: as figure 1 As shown, a modulus matching strain test sensing element of the present invention is in the shape of a strip, which includes a thin plate 1 in the lower layer, a sensitive film 2 in the middle layer, electrodes 3 and an insulating protective film 4 in the upper layer. The object to be subjected to strain testing is a high-pressure polyethylene plastic PE structure. A low-pressure polyethylene PE sheet with a smaller elastic modulus is selected as the lower sheet 1. The thickness of the sheet 1 is 0.3mm, the length is 50mm, and the width is 10mm. The sensitive film 2 of the middle layer is made of phenoxy resin as a matrix and conductive carbon nanotubes as a filling material, and is prepared into a conductive polymer composite material, which is then printed on the thin plate 1; before printing, the upper surface of the thin plate 1 is cleaned with a solvent to ensure D. The electrodes 3 of the middle layer are printed on the thin plate 1 usin...

Embodiment 3

[0025] Embodiment 3: as figure 1 As shown, a modulus matching strain test sensing element of the present invention is in the shape of a strip, which includes a thin plate 1 in the lower layer, a sensitive film 2 in the middle layer, electrodes 3 and an insulating protective film 4 in the upper layer. The object of the strain test is the soil structure. A silicon rubber sheet with a smaller elastic modulus is selected as the lower sheet 1. The thickness of the sheet 1 is 0.1mm, the length is 50mm, and the width is 10mm. The sensitive film 2 of the middle layer is made of silicone rubber as a matrix and conductive carbon black as a filling material, and is prepared into a conductive polymer composite material, and then printed on the thin plate 1; before printing, the upper surface of the thin plate 1 is cleaned with a solvent to ensure the printing effect . The electrodes 3 of the middle layer are printed on the thin plate 1 using commercially available printable conductive si...

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Abstract

The invention, which belongs to the field of the test sensing element and the manufacturing method thereof, provides a strain test sensing element with matched modulus and a manufacturing method thereof. The sensing element comprises a thin plate arranged at a bottom layer, a sensitive thin film arranged at an intermediate layer, electrodes arranged at the intermediate layer, and an insulating protection film arranged at a top layer. The thin plate arranged at the bottom layer is a plastic or rubber thin plate and is selected and determined based on the modulus of a strain test object. According to the sensitive thin film and the electrodes that are arranged at the intermediate layer, the electrodes are arranged at the two ends of the sensitive thin film; and the sensitive thin film is formed by printing of a conductive macromolecule composite material and the electrodes are formed by printing of conductive silver pastes. The insulating protection film arranged at the top layer is formed by printing of a resin or rubber material. The thin plate at the bottom layer, the sensitive thin film and the electrodes at the intermediate layer, and the insulating protection film at the top layer are selected according to the modulus of the tested object, thereby realizing modulus matching; and then a strain test sensing element is manufactured. Synchronous strain of the sensing element and the tested object can be realized well; the tested strain value becomes accurate; the testing range can be met well; and the test precision is improved. Moreover, the cost is low and the effect is good on the condition of batch production.

Description

technical field [0001] The invention relates to a test sensing element and a manufacturing method thereof, in particular to a modulus-matched strain testing sensing element and a manufacturing method thereof. Background technique [0002] The current method used for strain testing is mainly the use of ordinary resistance strain gauges, which are made of Φ=0.02-0.05mm constantan wire or nickel-chromium wire wound into a grid shape (or corroded into a grid shape with a very thin metal foil) and clamped. Made in two layers of insulating sheets (substrate), the sensitivity of this strain gauge is about 2, and the effective range of strain testing is about 0.5%. It is used for materials with large elastic modulus such as rocks, concrete, and steel structures. Relatively effective when small (less than 0.5%) tested. For other materials with small modulus, such as various plastics, rubber, etc., the strain of these materials is generally large, and the modulus of the resistance st...

Claims

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Application Information

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IPC IPC(8): G01B7/16
Inventor 周国庆廖波季雨坤常传源况联飞周檀君赵光思梁恒昌商翔宇
Owner CHINA UNIV OF MINING & TECH
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