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Method for measuring bidirectional strain gradient field of structure, sensor and application

A strain sensor and strain gradient technology, applied in the field of engineering mechanics, can solve the problems of small number of test points, inability to measure, high measurement cost and data processing cost, and achieve the effect of improving measurement capability and reducing measurement cost.

Pending Publication Date: 2021-04-02
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because measurement personnel often cannot enter closed structures and three-dimensional solid structures to paste strain gauges
Second, the number of test points is small and scattered, and it is impossible to calculate the axial strain gradient and displacement of the component along a certain direction
Third, for large components, multiple measurement points need to be arranged, a large number of strain gauges and corresponding strain data acquisition instruments need to be used, and the measurement cost and data processing cost are high
Fourth, it is impossible to measure data with concentrated strain (stress) sets

Method used

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  • Method for measuring bidirectional strain gradient field of structure, sensor and application
  • Method for measuring bidirectional strain gradient field of structure, sensor and application
  • Method for measuring bidirectional strain gradient field of structure, sensor and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]Such asfigure 1 As shown, a bidirectional strain sensor includes a flexible substrate 03, and two groups of optical fiber pairs in each other in the flexible matrix 03; each group of optical fibers comprise several optical fiber pairs; the fiber pairs within the group are parallel. The optical fiber pair the first fiber 01 and the second fiber 02 including a pair of pairs of parallel, the optical fiber is perpendicular to the plane of the plane and the two sets of fibers;

[0027]When the strain gradient of the component is measured, the flexible substrate 03 is bonded to the member, and the optical fiber is perpendicular to the neutral layer perpendicular to the member.

[0028]The two-way strain sensor provided in this embodiment can replace the existing strain sheet for measuring the two-way strain data of the member. Specifically, the bidirectional strain sensor includes a flexible substrate 03, as well as two groups of optical fiber pairs in each other within the flexible subst...

Embodiment 2

[0035]Such asfigure 2 As shown, the present invention also provides a strain gradient field measurement method, including:

[0036]The strain sensor is provided on the plate member 10;

[0037]The first strain data is measured by the first fiber 01 of the strain sensor, and the second strain data is measured by the second fiber 02 of the strain sensor;

[0038]The strain gradient of a certain strain pair is determined based on the first strain data and the second strain data.

[0039]Here, the strain sensor can be bonded on one side of the shell member 10, and each of the first fiber 01 and the second fiber 02, respectively, the first strain data and the second strain data are measured, according to the first strain data and the second strain. The data calculates the strain gradient of the shell member 10.

[0040]For example, ifimage 3 According to the screenshot of the leftmost plate housing member, X is the distance of the neutral shaft to the second surface 102 (lower surface) of the shell mem...

Embodiment 3

[0076]The present invention also provides a strain gradient field measurement method, including:

[0077]A number of strain sensors as described above are provided on the thin plate member or the thin shell member, wherein the strain sensor comprises a first strain sensor disposed in the X direction and a second strain sensor disposed in the Y direction, the X direction and the Y. The direction is orthogonal to each other;

[0078]The X-direction strain data is measured by the first strain sensor, and data is changed by the Y direction of the second strain sensor;

[0079]The strain member or the stranded gradient field of the thin plate member or the thin shell member is determined according to the X direction strain data and the Y direction strain data.

[0080]In this embodiment, the strain sensor can be provided at the thin plate member or the thin shell member, and the strain data of the plurality of test points (including the X direction strain data and the Y direction strain data), there...

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Abstract

The invention relates to the field of engineering mechanics, and discloses a method for measuring a bidirectional strain gradient field of a structure, a sensor and application. The sensor comprises aflexible substrate and two groups of optical fiber pairs which are embedded in the flexible substrate and are perpendicular to each other; each group of optical fibers comprises a plurality of optical fiber pairs; the optical fiber pairs in the group are parallel to each other and comprise a first optical fiber and a second optical fiber which are parallel to each other, and the plane where the optical fiber pairs are located is perpendicular to the plane formed by the two optical fiber pairs; when the strain gradient of the component is measured, the flexible substrate is attached to the component, and the plane where the optical fiber pair is located is perpendicular to the neutral layer of the component. The distributed optical fiber sensing technology is utilized, the measuring capacity of strain data can be improved, and the measuring cost of the strain data is reduced.

Description

Technical field[0001]The present invention relates to the field of engineering mechanics, and more particularly to a method, sensor and application of a measurement of two-way strain ladder fields.Background technique[0002]Traditional measuring strain gradient methods typically use strain sheets, double-layer curved strain, fiber gratings, etc. For example, a plurality of strain sheets are pasted to different locations of the member (such as the upper and lower surface of the shell member), and the strain data of different positions is measured. However, this measurement method has a number of disadvantages. First, the measurement method is not suitable for the measurement of strain gradients such as a box beam, silo, fuel tank, etc.) and a three-dimensional solid structure (such as concrete block, engine, etc.) in the thickness direction. This is because measurement people often enter the closed structure and the interior of the three-dimensional solid structure. Second, the number...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16G01L1/24
CPCG01B11/16G01L1/242G01L1/247
Inventor 陈建飞吴嘉瑜邵理阳
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA