Double-cartridge electromagnetic drive device used for split Hopkinson pressure bar
A Hopkinson pressure rod, electromagnetic drive technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problem of complex non-electromagnetic material bullets, reduce difficulty and complexity, and avoid the effect of introduction
Active Publication Date: 2016-02-10
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
[0003] In order to overcome the complexity of the existing Hopkinson pressure bar electromagnetic drive device in driving non-electromagnetic material bullets and the lack of an anti-back pull design, the present invention proposes a dual-bullet electromagnetic drive for the Hopkinson pressure bar device
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Embodiment 1
[0024] In the embodiment, the main bullet has a diameter of 16mm and a length of 25mm, and the auxiliary bullet has a diameter of 10mm and a length of 90mm. The rear movement also pushes the auxiliary bullet to move backward, during which the two bullets are not separated. When the main bullet moves to the middle of the main rail, due to the reverse electromagnetic force, the main bullet will decelerate, while the auxiliary bullet will continue to move backward at the original speed because it is not affected by the electromagnetic force, and the two bullets will be separated from then on. In the end, the main bullet was blocked by the buffer device, and the secondary bullet was successfully fired.
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Abstract
The invention discloses a double-cartridge electromagnetic drive device used for a split Hopkinson pressure bar. The double-cartridge electromagnetic drive device comprises main guide rails, a main cartridge, an auxiliary guide rail, an auxiliary cartridge and buffering devices. The auxiliary guide rail is connected with the main guide rail. The inner diameter of the auxiliary guide rail is smaller than that of the main guide rails. The main cartridge is connected with the main guide rails. The auxiliary guide rail is connected with the main guide rails. The buffering devices are arranged at the joints of the main guide rails and the auxiliary guide rail. At the initial moment, the main cartridge is located at the front ends of the main guider rails and abuts against the auxiliary cartridge. By means of the double-cartridge electromagnetic drive device, difficulty and complexity of a conventional electromagnetic drive device for driving cartridges made from non-electromagnetic materials are lowered.
Description
technical field [0001] The invention relates to the field of testing the dynamic mechanical properties of materials, in particular to a double-bullet electromagnetic drive device for a Hopkinson compression bar. Background technique [0002] The split Hopkinson pressure bar (SHPB) technique is an experimental method for testing the dynamic mechanical properties of materials. Since it was proposed by Kolsky in 1949, it has been widely used in the testing of mechanical properties of engineering materials under high strain rates. The bullet in the Hopkinson compression rod device is an important part of it. Its function is to hit the incident rod at a certain speed to generate an incident wave to load the test piece, and the device that allows the bullet to gain speed is called the driving device. At present, the driving devices in the common Hopkinson pressure rod are mainly divided into two types: high-pressure gas loading and electromagnetic loading. Although the electromag...
Claims
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IPC IPC(8): G01N3/02
Inventor 汤立群谢倍欣史景伦刘泽佳蒋震宇刘逸平姜锡权赵伟健佘翰笙
Owner SOUTH CHINA UNIV OF TECH
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