Testing device for assisting rod-shaped sample uniaxial drawing through pulse current

Abstract

The invention provides a testing device for assisting rod-shaped sample uniaxial drawing through pulse current. The device comprises a pulse power source and a drawing test machine, the drawing test machine comprises drawing clamps and a driving device, the drawing clamps are fixedly connected with the two ends of a rod-shaped sample, the driving device is used for driving the drawing clamps to get close to or away from each other, and the two ends of the rod-shaped sample are provided with conductive rings connected with the positive pole and the negative pole of the pulse power source respectively. Each drawing clamp is provided with a wedged-shaped cavity, wherein the cavity is internally provided with two opposite insulating clamping blocks, the opposite sides of the two insulating clamping blocks are provided with clamping grooves, each clamping groove is internally provided with a positioning clamping block, the opposite sides of the two positioning clamping blocks are provided with positioning grooves used for containing the two ends of the rod-shaped sample and the conductive rings, and knurled anti-skid structures are arranged on the contact surfaces of the positioning grooves and the rod-shaped sample. The device is suitable for research of deformation behaviors of rod-shaped metal materials under the action of the pulse current, processing of the sample is facilitated, material waste is avoided, and joule heat generated at the joints is reduced.

Description

technical field [0001] The invention relates to the technical field of testing devices for deformation behavior of metal materials, in particular to a testing device for uniaxial stretching of rod-shaped samples assisted by pulse currents. Background technique [0002] Since the former Soviet scholar O.A.Troitskii et al. found that pulse current had a significant effect on the deformation behavior of zinc single crystal, pulse current as a new material processing method has attracted people's attention. Studies have shown that pulsed current can enhance the deformation ability of materials, that is, electroplasticity. The research results of K.Okazaki and H.Conrad et al. have confirmed that pulse current can reduce the deformation resistance of pure Ti, Pb, Sn, thereby improving their metal ductility; Jiang et al. studied the effect of pulse current on AZ91 magnesium alloy rolling. After the impact, it was found that the pulse current improved the formability of the AZ91 ma...

AI Technical Summary

Problems solved by technology

[0004] 1. According to the national and industry standards, the existing research methods are to process the metal sample into a plate structure with a thickness of 1-3 mm. Since the accuracy of the sample specification must be guaranteed within a small size range, the processing is very difficult. ;

[0005] 2. If the plate-shaped sample with large size error is used for the test, the reliability of the final test result is not high, which is not conducive to the development of research work;

[0006] 3. In order to obtain accurate data, whether it is to choose multiple repeated tests or adopt fine processing methods, it will increase the cost of the test and lead to waste of materials. Considering that some metals are difficult to synthesize and expensive, this limits the scope of relevant research. conduct

The structure of this invention is simple, the insulation safety cannot be guaranteed, and it is limited to the electrified thermal tensile test on the plate-shaped sample, which cannot solve the problems existing in the above-mentioned plate-shaped sample; in addition, because the clamping plate itself is a fixed part , the structure is bulky, when a large current (hundreds or even thousands of amperes) passes through, the clamping plate will generate a lot of Joule heat

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