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Resistance strain gauge switching device for testing steel rail residual stress and testing method

A technology of resistance strain gauge and residual stress, applied in the direction of measuring device, measuring force, instrument, etc., can solve the problems affecting the accuracy and validity of test results, short circuit of resistance strain gauge, waste of sample, etc., and achieve accurate and effective test data. , the residual stress value is accurate, the residual stress value is accurate and effective

Active Publication Date: 2015-04-22
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of attaching strain gauges requires repeated welding and soldering away of the conductive wire when there are many test points, which is very easy to cause damage to the resistance strain gauge, short circuit of the resistance strain gauge, and disconnection of the conductive wire, resulting in waste of samples and affecting the accuracy of the test results. Accuracy and Validity

Method used

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  • Resistance strain gauge switching device for testing steel rail residual stress and testing method
  • Resistance strain gauge switching device for testing steel rail residual stress and testing method
  • Resistance strain gauge switching device for testing steel rail residual stress and testing method

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] Such as figure 1As shown, the resistance strain gauge adapter device for testing the residual stress of rails of the present invention includes an adapter plate 2 and an adapter column 3, and the adapter column 3 is a copper wire section with a diameter of 0.3 to 0.8 mm and a length of 8 to 15 mm; The connecting plate 2 is a conductive substrate with an insulating area 203 in the middle. The insulating area 203 insulates the conductive substrate into a first conductive area 201 and a second conductive area 202. The length of the adapter plate 2 is 7-15 mm and the width is 4 mm. ~8 mm; the transfer post 3 includes a first transfer post 301 and a second transfer post 302 which are welded on the first conductive area 201 and the second conductive area 202 correspondingly.

[0039] Among them, the transfer post 3 is used for electrical connection wi...

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Abstract

The invention discloses a resistance strain gauge switching device for testing steel rail residual stress and a testing method. The testing method comprises the six steps of adopting a conductive substrate provided with an insulation area in the middle and a switching column resistance strain gauge switching device, manufacturing a test sample, manufacturing the resistance strain gauge switching device, arranging the resistance strain gauge and the resistance strain gauge switching device, measuring initial strain of a test point steel rail sample, measuring the strain of a test point of the sawn steel rail and calculating a residual stress value of the test point of the steel rail so as to achieve steel rail residual stress testing. The data tested by means of the method meet the residual stress distribution of the steel rail and are accurate and effective.

Description

technical field [0001] The invention relates to the technical field of stress measurement, in particular to an electrical resistance strain gauge adapter device and a testing method for testing the residual stress of rails. Background technique [0002] The residual stress has a great influence on the service performance of the rail, especially the fatigue performance. When there is a large residual stress in the rail, it is prone to instability and fracture of the rail during use, which directly affects the safety of railway transportation. In "TB / T 2344-2012 43kg / m~75kg / m Rail Ordering Technical Conditions", it is clearly required that the longitudinal tensile stress of the rail bottom shall not be greater than 250MPa. Therefore, residual stress tests on rails are required. [0003] The residual stress test of the rail usually uses the method of attaching strain gauges to measure the residual stress in the rail. The traditional method of attaching strain gauges is to ta...

Claims

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Application Information

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IPC IPC(8): G01L1/22
Inventor 汪渊邹明宁雄显郭华韩振宇邓勇袁俊陈崇木
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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