Temperature measurement method for electrified tensile test piece and tensile test device

Abstract

The invention discloses a temperature measurement method for electrified tensile test pieces and a tensile test device. An electronic universal testing machine with an insulating chuck is used for finishing an electrified unidirectional tensile test of metal test pieces and real-time measurement on the temperatures of the test pieces through thermocouple matching. The method comprises the steps: firstly spraying a protective agent to each of the test pieces to carry out anti-oxidization treatment; after the surface protective coating layers are naturally dried at a room temperature, performing insulating treatment on a thermocouple, clamping the two unidirectional tensile test pieces by the insulating chuck of the electronic universal testing machine, clamping the thermocouple between the two test pieces to ensure that the temperature measured by the thermocouple is the real temperatures of the center positions of the test pieces, electrifying a direct current power supply to heat the test pieces, and measuring the temperatures of the test pieces in real time by a thermocouple temperature measurer; after the test pieces reach the stable temperatures, switching on the electronic universal testing machine to carry out the unidirectional tensile test on the test pieces. Therefore, accurate temperature measurement on the unidirectional tensile test pieces can be guaranteed; furthermore, the test device is simple in structure, short in manufacturing period and low in cost.

Description

technical field [0001] The invention relates to the technical field of thermal forming of metal materials, in particular to a temperature measurement method and a tensile test device for an electrified tensile test piece. Background technique [0002] For some metal structural materials, at room temperature, their forming is difficult and their springback is large. However, if the material blank is thermoformed, its formability can be greatly improved. Springback and wrinkling can basically be eliminated in the thermoforming process. Therefore, various material thermoforming methods such as thermal radiation heating, electric furnace heating, oxyacetylene flame heating and resistance heating have emerged. The resistance heating forming process is a process that uses the characteristics of low thermal conductivity and high resistivity of the material to energize the part to be processed and heat it to the forming temperature. The advantage of resistance heating is that the w...

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Problems solved by technology

[0005] In order to solve the problem of accurate temperature measurement of electrified tensile test piece and installation and fixation of thermocouples in the prior art, the present invention proposes a temperature measurement method and tensile test device of electrified tensile test specimen

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