Stretching and compression stress wave generator based on electromagnetic force and experimental method

Abstract

The invention provides a stretching and compression stress wave generator based on electromagnetic force and an experimental method. The stress wave generator is such structured that a capacitor charger is connected with a loading gun. A main coil, an insulating layer and a secondary coil all sleeve the locating shaft of a tapered amplifier. A power supply system is employed to provide the main coil of the loading gun with instant strong current, so strong eletromagnetic repulsion is generated between the main coil and the secondary coil; and the eletromagnetic repulsion is converted into stress waves which are amplified by the tapered amplifier and then output to a Hopkinson bar. The stretching and compression stress wave generator has a simple structure and strong controllability, can realize a strain rate and a strain scope which cannot be reached by a traditional disconnect-type Hopkinson bar, allows Hopkinson bar experimental techniques to be standardized, realizes integration of experimental apparatuses of a pull bar and a pressure bar and reduces complexity and occupied space of equipment.

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 Tensile and compressive stress wave generator and experimental method based on electromagnetic force

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