Electromagnetic-force-based Hopkinson tie/pressure bar stress wave generator and experimental method

Abstract

The invention discloses an electromagnetic-force-based Hopkinson tie / pressure bar stress wave generation device and an electromagnetic-force-based Hopkinson tie / pressure bar stress wave generation method. The stress wave generation device consists of a loading gun and a power supply system, wherein the power supply system is used for providing instantaneous high current for a primary coil of the loading gun, so as to generate high electromagnetic repulsive force between the primary coil and each secondary coil. A capacitor is short in discharge time and high in discharge current, so that instantaneous high repulsive force can be generated between the primary coil and each secondary coil to generate high stress pulses, and the stress pulses are output to Hopkinson bars after being amplified by a tapered amplifier. According to the device and the method, an electromagnetic riveter is structurally improved to be applied to the loading of the separable Hopkinson pressure bars and tie bars, so that loading systems of the Hopkinson pressure bars and tie bars can be simultaneously implemented on a same device; the device and the method have the characteristics of simplicity in operation and high controllability.

Description

technical field [0001] The present invention relates to a stress wave generating device and method for testing dynamic mechanical properties of materials, in particular to a stress wave generating device and method based on electromagnetic force. input device. Background technique [0002] At present, in the field of material science, the most widely used methods for measuring the mechanical properties of materials under high strain rates are split Hopkinson compression rod technology and tension rod technology. The basic principle of this method is: place a short sample between two tension rods or compression rods, and input a tensile stress wave or a compressive stress wave to the incident rod in a certain way to load the sample. Simultaneously, the pulse signal is recorded by using the strain gauge glued on the tie rod or the pressure rod at a certain distance from the end of the rod. If the tension or compression rod remains elastic, the pulses in the rod will propagat...

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Problems solved by technology

[0007] In order to overcome the shortcomings in 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, and the tension and compression loading devices cannot be unified, the present invention proposes a Device and method for generating stress waves of Hopkinson tension and compression rods based on electromagnetic force

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