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Long-gauge length carbon fiber strain sensing device and method for testing same

A strain sensor and strain sensing technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement device, etc., can solve the problems of reducing the operability and repeatability of carbon fiber sensing elements, so as to improve the operation performance and durability , The effect of simplifying the layout procedure

Active Publication Date: 2013-12-18
南京东智安全科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, resin is an important part of stress transmission, and its physical properties such as elastic modulus and bond strength are easily affected by ambient temperature, resulting in the nonlinear output of carbon fiber sensing elements and reducing the carbon fiber sensing elements. operability and repeatability

Method used

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  • Long-gauge length carbon fiber strain sensing device and method for testing same
  • Long-gauge length carbon fiber strain sensing device and method for testing same
  • Long-gauge length carbon fiber strain sensing device and method for testing same

Examples

Experimental program
Comparison scheme
Effect test

example example 1

[0051] It can be seen in the long-term cyclic loading test of the long-gauge carbon fiber strain sensor device of the present invention that the length of 5 gauge lengths is 500 mm, and its experimental setup diagram is as follows Figure 9 shown. Although the temperature fluctuates up and down in a day's cycle, the obtained signal does not change accordingly but truly reflects the change of the load. The linearity of the signal obtained in the entire cycle is very good, and the signal consistency of each sensor is good.

example example 2

[0053] It can be seen that the long gauge carbon fiber strain sensing device of the present invention is placed in the heating box for 2 gauge lengths of 500 millimeters and carries out dry heating and water bath heating test in the water tank with temperature control device, although The two sensing devices are in different humidity environments, but there is no obvious difference in the obtained signals. The upper limit of the heating temperature is 70 degrees Celsius, which reaches the glass transition temperature of the resin. The nonlinear deformation of the resin will affect the thermal sensitivity of the carbon fiber sensing element. coefficient, but the long-gauge-length packaged carbon fiber strain sensor achieves uniform deformation and is not significantly affected. Therefore, the sensing device of the present invention is suitable for long-term monitoring of structures under different temperature and humidity conditions.

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Abstract

The invention discloses a long-gauge length carbon fiber strain sensing device. The long-gauge length carbon fiber strain sensing device comprises two groups of long-gauge length carbon fiber strain sensing elements with the same geometric size, three isolation film layers with the same size, a measurement connector, two anchoring sections and two parallel connectors, wherein one ends of the long-gauge length carbon fiber strain sensing elements are connected with the parallel connectors through electrodes respectively, the other ends of the long-gauge length carbon fiber strain sensing elements are connected with the measurement connector in series, and the two groups of long-gauge length carbon fiber strain sensing elements are located between adjacent isolation films respectively and have the same strain sensitivity coefficient and the same thermosensitivity coefficient. The long-gauge length carbon fiber strain sensing device achieves sensing of micro structural strain within a large range under long-term instable temperature and humidity conditions to meet civil engineering structural stress (strain) continuous detection and monitoring requirements.

Description

technical field [0001] The invention relates to a technology for health detection and monitoring in civil traffic structures, in particular to a long-gauge carbon fiber strain sensing device suitable for long-term monitoring and distributed strain sensing and a testing method thereof. Background technique [0002] In the structural health monitoring system, the long-term static stress (strain) monitoring and the detection of the dynamic response of the structure after excitation are important methods for evaluating the long-term performance of the structure and identifying damage. In practical applications, the unstable working environment (corrosion, high temperature) on site has great interference to the normal use of the sensor, often leading to detection errors. At this time, a stable sensor that can monitor in a wide range is particularly important. Carbon fiber is a high-strength, corrosion-resistant structural material that also has force-resistance properties. As a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 吴智深黄璜刘建勋
Owner 南京东智安全科技有限公司
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