Experimental device of split hopkinson pressure bar based on electromagnetic force load

Abstract

The invention discloses an experimental device of a split hopkinson pressure bar based on electromagnetic force load. The experimental device comprises an electromagnetic riveting device and a split hopkinson pressure bar experiment device, wherein the electromagnetic riveting device is arranged at one end of an incident bar of the split hopkinson pressure bar experiment device; the end face of an electromagnetic riveting gun on the electromagnetic riveting device is in full contact with the end face of the end of the incident bar, so that the electromagnetic riveting device can generate stress pulse which is directly input into the incident bar and generated pulse signals can be accurately controlled. By adopting the experimental device, the split hopkinson pressure bar is not greatly improved; the electromagnetic riveting device is only used for replacing an air gun in a conventional split hopkinson pressure bar system; accurate control of stress wave is achieved in an electromagnetic way; meanwhile, the width of the stress wave generated by the electromagnetic load is not limited by the length of an impacting bar, so that the width of the stress wave generated by the experimental device is large enough at a high strain rate, thereby achieving the normalization of experimental technologies of the split hopkinson pressure bar.

Description

technical field [0001] The invention relates to a device for testing the dynamic mechanical properties of materials, in particular to a separate Hopkinson pressure bar experimental device based on electromagnetic force loading. Background technique [0002] Currently, the split Hopkinson bar technique is most widely used in the field of materials science to measure the mechanical properties of materials at high strain rates. The basic principle of this method is that a short sample is placed between two compression rods, and the sample is loaded by an accelerated mass, an acceleration pulse generated by the impact of the short rod or an explosion. At the same time, the pulse signal is recorded by using the strain gauge which is glued to the pressure rod and has a certain distance from the end of the rod. If the compression rod remains elastic, the stress pulse in the rod will propagate without distortion at the elastic wave speed. In this way, the strain gauge attached to ...

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Problems solved by technology

[0005] In order to overcome the shortcomings of the prior art that the amplitude of the incident wave is difficult to control, the operation is cumbersome, the strain range is limited, and some low strain rate experiments cannot be realized, the present invention proposes a separate Hopkinson pressure rod based on electromagnetic force loading experimental device

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