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

Abstract

The invention provides a pulse current-assisted uniaxial tensile test device for a rod-shaped sample, which includes a pulse power supply and a tensile testing machine. The tensile testing machine includes tensile fixtures fixedly connected to both ends of the rod-shaped sample and The driving device that drives the tensile fixtures to approach or move away from each other, and the two ends of the rod-shaped sample are respectively provided with conductive rings connected to the positive and negative poles of the pulse power supply; a wedge-shaped cavity is provided on the tensile fixture and each type There are two oppositely arranged insulating clips in the cavity, and a card slot is provided on the opposite surface of the two insulating clips, and a positioning clip is provided in each card slot, and a positioning clip is provided on the opposite surface of the two positioning clips. There are positioning grooves for accommodating the two ends of the rod-shaped sample and the conductive ring, and a knurled anti-skid structure is provided on the contact surface between the positioning groove and the rod-shaped sample. The device is suitable for the research on the deformation behavior of rod-shaped metal materials under the action of pulse current, facilitates the processing of samples, avoids waste of materials and reduces the generation of Joule heat at joints.

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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