Temperature-strain integrated measuring method in high-temperature tension test

A measurement method and grayscale technology, applied in thermometers, heat measurement, measuring devices, etc., can solve the problems of result influence, decorrelation effect cannot be measured, and use temperature cannot be reached, so as to overcome the influence of environmental factors and avoid definite emission Rate, to achieve the effect of strain measurement

Inactive Publication Date: 2016-07-20
CHONGQING UNIV
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Problems solved by technology

However, the strain gauge is sensitive to the temperature of the measured point, and temperature fluctuations and thermoelectric coupling effects will have a great impact on the results
Due to the limitation of the resistance strain gauge material, its service temperature cannot reach a higher temperature
The non-contact method developed in recent years is mainly the digital image correlation method, which can realize the measurement of the strain field at 1200 °C, and

Method used

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  • Temperature-strain integrated measuring method in high-temperature tension test
  • Temperature-strain integrated measuring method in high-temperature tension test
  • Temperature-strain integrated measuring method in high-temperature tension test

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Experimental program
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Effect test

Embodiment 1

[0034] figure 2 In the process, fix the test piece support platform 2, industrial camera 4, and two-color thermometer 5 on the base plate 1, and install the test piece 3 on the support platform 2; adjust the positions of the industrial camera 4 and the two-color thermometer 5, so that the industrial The field of view of the camera 4 and the temperature measurement point of the two-color thermometer 5 are located on the test piece 3 . The industrial camera 4 is directly connected to the computer, and its acquisition rate is controlled by software, and the acquisition rate is set at 1S / s; the two-color thermometer 5 is connected to the computer through an acquisition card, and the acquisition rate is set at 10S / s.

[0035] After the experimental equipment is ready, the gray scale calibration is carried out first: the test piece is heated with a high-power DC power supply, and when the temperature reaches 1000°C, the two-color thermometer starts to record the temperature data, a...

Embodiment 2

[0038] image 3 Among them, the vacuum box 6, the industrial camera 4, and the two-color thermometer 5 are fixed on the bottom plate 1, the test piece support table 2 is fixed in the vacuum box 6, and the test piece 3 is installed on the test piece support table 2. The industrial camera 4 and the two-color thermometer 5 observe the test piece located inside the vacuum box 6 through the observation window 7, and adjust the positions of the industrial camera 4 and the two-color thermometer 5 so that the field of view of the industrial camera 4 and that of the two-color thermometer 5 The temperature measuring point is located on the test piece. The industrial camera 4 is directly connected to the computer, controls its acquisition rate by software, and directly stores the collected images in the computer; the two-color thermometer 5 is connected to the computer through the acquisition card, and the acquisition card directly controls the temperature acquisition rate, and Store th...

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Abstract

A temperature-strain integrated measuring method in high-temperature tension test comprises the following steps: 1) establishing a relation between gray scale and temperature; 2) in the calibration stage: (1) heating material to be detected, collecting temperature change data of points to be measured by a two-color thermometer, and collecting image data simultaneously by an industrial camera; (2) converting the image data into a grey-scale map in a computer and extracting the grey level of the tested points; (3) fitting a formula according to the gray level data and the temperature data; and (4) determining parameters A and B; and 3) in the measuring stage: (1) extracting initial coordinates and initial grayscale characteristics of two mark points in an initial grey-scale map; and (2) converting the grey-scale map into a temperature map according to the relation between gray scale and temperature and the parameters A and B obtained in the calibration stage, so that full-field temperature can be obtained in real time. Meanwhile, by utilizing the initial grayscale characteristics of the two mark points and through an initial scale distance L and a follow-up scale distance L', scale distance change delta L can be obtained, thereby obtaining axial strain delta L/L. Through the utilization of the two-color thermometer and the high-resolution industrial camera, both high-precision full-field high temperature measurement and high-precision strain measurement are realized.

Description

technical field [0001] The invention belongs to the technical field of temperature and strain measurement, in particular to a temperature-strain integrated measurement method for simultaneous measurement of the temperature field and axial strain of the entire region under ultra-high temperature. Background technique [0002] At present, temperature measuring instruments are mainly divided into two categories: contact type and non-contact type. Commonly used contact measuring instruments mainly include thermocouples, resistance thermometers and semiconductor thermistor thermometers, etc., which are characterized by simplicity, intuition and reliability. However, its temperature measurement range is generally below 2000°C, and the contact method is likely to affect the temperature of the measured object; and in actual operation, its dynamic characteristics are poor and the response time is long. The other is a non-contact temperature measuring instrument developed by the prin...

Claims

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Application Information

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IPC IPC(8): G01K11/00G01B11/16G01D21/02
CPCG01K11/00G01B11/16G01D21/02
Inventor 魏榛陈校生彭向和岳兴杨昌棋
Owner CHONGQING UNIV
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