CN-121576982-B - High-temperature static strain gauge and preparation method thereof

CN121576982BCN 121576982 BCN121576982 BCN 121576982BCN-121576982-B

Abstract

The invention provides a high-temperature static strain gauge and a preparation method thereof, wherein the preparation method comprises the steps of S01, carrying out surface treatment on a test piece, S02, pasting a working strain gauge on the surface of the test piece, S03, paving a first high-temperature cotton insulating layer above the working strain gauge, S04, paving a compensation strain unit on the first high-temperature cotton insulating layer, S05, paving a second high-temperature cotton insulating layer on the compensation strain unit, and S06, carrying out bridging and covering a protective layer on the second high-temperature cotton insulating layer. The invention solves the problem of large difference between steady-state heat output and transient heat output caused by a curve correction method, and realizes the real-time measurement of static strain in a high-temperature environment.

Inventors

DENG JIALE
ZHANG WENXUE
CHEN XIANG
LIANG GUANWEI
WANG HE
LI SHENGXIANG
LV HONGYU
HU CHANGQING

Assignees

中国航发四川燃气涡轮研究院

Dates

Publication Date: 20260505
Application Date: 20260126

Claims (9)

1. The preparation method of the high-temperature static strain gauge is characterized by comprising the following steps of: Step S01, carrying out surface treatment on a test piece; Step S02, sticking a working strain gauge on the surface of the test piece; step S03, paving a first high-temperature cotton insulating layer above the working strain gauge; step S04, paving a compensation strain unit on the first high-temperature cotton insulating layer; Step S05, a second high-temperature cotton insulating layer is paved on the compensation strain unit, the compensation strain unit is completely wrapped by the first high-temperature cotton insulating layer and the second high-temperature cotton insulating layer, is not in direct contact with the test piece, is prevented from being influenced by acting force generated by deformation of the test piece, and can only sense temperature change; And S06, performing bridging and covering the protective layer on the second high-temperature cotton insulating layer.
2. The method for manufacturing the high-temperature static strain gauge according to claim 1, wherein the step S01 is specifically to remove impurities on the surface of the position to be stuck of the test piece and perform flatness adjustment work.
3. The method for manufacturing a high-temperature static strain gauge according to claim 2, wherein the step S02 is specifically to paste the working strain gauge on the surface of the position to be pasted by a flame spraying method.
4. The method for manufacturing a high-temperature static strain gauge according to claim 3, wherein the step S04 specifically comprises: Sticking a compensation strain gauge on a metal sheet of the same material as the test piece and forming a compensation strain unit; the compensation strain unit is placed on the first high temperature cotton insulation layer.
5. The method of manufacturing a high temperature static strain gauge according to claim 4, wherein the step S06 comprises: and forming a half bridge by the working strain gauge and the lead wire of the compensation strain gauge so as to offset the strain value caused by temperature.
6. The method of manufacturing a high temperature static strain gauge according to claim 5, wherein step S06 further comprises: And covering the whole second high-temperature cotton insulating layer with the protective layer, and leading out leads of the working strain gauge and the compensation strain gauge from the reserved hole of the protective layer.
7. The method of claim 6, wherein the first high temperature cotton insulation layer and the second high temperature cotton insulation layer are made of alumina fiber cotton.
8. A high temperature static strain gauge comprising: a working strain gauge (2) stuck on the test piece (1); The first high-temperature cotton insulating layer (3) is paved on the upper surface of the working strain gauge (2); The compensation strain unit is paved on the upper surface of the first high-temperature cotton insulating layer (3); The compensation strain unit is completely wrapped by the first high-temperature cotton insulating layer and the second high-temperature cotton insulating layer, is not in direct contact with the test piece, is prevented from being influenced by acting force generated by deformation of the test piece, and can only sense temperature change; and the protective layer (7) is covered on the second high-temperature cotton insulating layer (6).
9. A high temperature static strain gauge according to claim 8, wherein the compensating strain unit comprises a compensating strain gauge (4) and a foil (5) which are glued to each other.

Description

High-temperature static strain gauge and preparation method thereof Technical Field The invention relates to the technical field of high-temperature static strain testing, in particular to a high-temperature static strain gauge and a preparation method thereof. Background The existing high-temperature static strain measurement method with the compensation strain gauge solves the problem that the compensation strain gauge has the same temperature field as the working strain gauge, but the installation surface evenness of the compensation strain gauge cannot be guaranteed, and the installation method of spraying fixation is carried out between the compensation strain gauge and the working strain gauge, so that the grid wires of the compensation strain gauge still deform along with the deformation of the working strain gauge, the problem that the compensation strain gauge is stressed is caused, and the condition that the compensation strain gauge only senses temperature but does not feel force cannot be met. Therefore, there is a need for a new high temperature static strain gauge with a compensation strain gauge in a high temperature environment. Disclosure of Invention In view of the above, the invention provides a method for preparing a high-temperature static strain gauge and a high-temperature static strain gauge, which are used for solving the problem that the compensation strain gauge cannot be stressed completely in the existing domestic high-temperature static strain test, and improving the precision and reliability of the high-temperature static strain measurement result. The invention provides the following technical scheme that 1, a preparation method of a high-temperature static strain gauge comprises the steps of S01, carrying out surface treatment on a test piece, S02, pasting a working strain gauge on the surface of the test piece, S03, paving a first high-temperature cotton insulating layer above the working strain gauge, S04, paving a compensation strain unit on the first high-temperature cotton insulating layer, S05, paving a second high-temperature cotton insulating layer on the compensation strain unit, and S06, carrying out bridging and covering a protective layer on the second high-temperature cotton insulating layer. A high-temperature static strain gauge comprises a working strain gauge, a first high-temperature cotton insulating layer, a compensation strain unit, a second high-temperature cotton insulating layer and a protective layer, wherein the working strain gauge is adhered to a test piece, the first high-temperature cotton insulating layer is paved on the upper surface of the working strain gauge, the compensation strain unit is paved on the upper surface of the first high-temperature cotton insulating layer, the second high-temperature cotton insulating layer is paved on the upper surface of the compensation strain unit, and the protective layer is covered on the second high-temperature cotton insulating layer. Compared with the prior art, the at least one technical scheme adopted by the invention has the beneficial effects that at least the beneficial effects comprise: the strain of the test piece is measured in the same temperature field by the compensation strain gauge and the working strain gauge, the problem that the difference between steady-state heat output and transient-state heat output is large due to a curve correction method is solved, and static strain real-time measurement in a high-temperature environment is realized. Breaking the limitation of the traditional compensation strain gauge adhesion stress. The novel compensation strain gauge pasting method ensures that the compensation strain gauge is only stressed by materials caused by temperature, solves the problem of pasting stress of the compensation strain gauge because the compensation strain gauge is wrapped by the high Wen Mianbao, can not cause uneven surface of the strain gauge because of the unevenness of the pasting position, and reduces the stress damage risk of the strain gauge. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. FIG. 1 is a schematic flow chart of a process for manufacturing a high temperature static strain gauge with a novel compensation strain gauge according to the present invention. Fig. 2 is a three-dimensional schematic diagram of a layered structure of a high-temperature static strain gauge with a novel compensation strain gauge according to the present invention. Fig. 3 is a schematic diagram of a two-dimensional structure of a high-temperature static strain gauge with a novel compensation strain gaug