An expansion stress testing device and method based on full strain

Abstract

The present invention provides a total strain-based expansion stress test device and method. According to the method, a total strain-based expansion stress test device is utilized. The device includes a solution tank, an expansion stress test tube, an LED lighting test system and a temperature monitoring system, wherein the expansion stress test tube is arranged in the solution tank and is used for accommodating a material to be tested; the upper surface of the solution tank is provided with a fine glass tube; the LED lighting test system comprises an LED transmitter and an LED lighting receiver which are correspondingly arranged at two sides of the fine glass tube and are located continuously and correspondingly; and the temperature monitoring system comprises a liquid temperature sensor arranged in the solution tank and a data recorder which is connected with the temperature sensor. According to the total strain-based expansion stress test method of the invention, LED lighting is utilized to monitor liquid surface change, so that the total expansion stress of the material can be obtained through inversion; the overall deformation condition of a steel pipe is calculated through the liquid surface change; the liquid surface change is amplified through the fine glass tube, and therefore, test sensitivity can be improved; and the continuous LED light sources are adopted to monitor the liquid surface change in the fine glass tube, so that dynamic monitoring of deformation data can be realized, and therefore, the defect that a current external tube method just can perform a spot test can be eliminated, and great help can be provided for the full strain test of the expansion stress of the material.

Description

technical field [0001] The invention relates to an expansion stress testing device and method based on full strain. Background technique [0002] The outer tube method is a common method for testing the expansion stress of materials. During its application, the deformation of the test tube under the action of material expansion force is mainly monitored by means of strain gauges and illumination methods, and then the expansion stress value is calculated based on the elastic modulus of the steel tube. However, in the application, it was found that by pasting several strain gauges on the steel pipe to monitor the strain of the steel pipe, the test results can only represent the deformation of the steel pipe where the strain gauges are pasted, and cannot explain the overall deformation of the steel pipe under the action of expansion stress. That is, it is impossible to accurately describe the overall expansion stress of the material to be tested in the test tube. The illuminat...

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Problems solved by technology

[0003] The present invention improves the above-mentioned problems, that is, the technical problem to be solved by the present invention is that the existing test results of the expansion stress of the existing external pipe method and the illumination method can only represent the deformation of the steel pipe at the place where the strain gauge is pasted, and cannot explain the steel pipe at the place where the strain gauge is pasted. Overall deformation under expansion stress, i.e. it is not possible to accurately describe the overall expansion stress of the material to be tested in the test tube

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