Loading device for disc type split-hopkinson torsional bar based on electromagnetic force and experimental method

Abstract

The invention relates to a loading device for a disc type split-hopkinson torsional bar based on electromagnetic force and an experimental method. In the loading device, an anode and a cathode of a power supply are respectively connected with an anode input end and a cathode input end of an electric energy storage and releasing device through wires; and an anode output end and a cathode output end of the electric energy storage and releasing device are respectively connected with the anode input end and the cathode input end of a torsion gun through wires. The loading device provided by the invention utilizes the electromagnetic energy-mechanical energy conversion principle to generate an instant electromagnetic torque in an electric control manner, utilizes a mechanical structure to convert the torque into torsional wave and is applied to the experiment of the split-hopkinson torsional bar. The electric control mode is adopted, so that the generation time of stress wave of the electromagnetic type split-hopkinson torsional bar shows unique superiority. An electronic switch is adopted for strictly controlling the generation time of the stress wave, so that the synchronism problem under a complex loading mode is solved.

Description

technical field [0001] The invention relates to a loading device and an experimental method for testing dynamic torsional mechanical properties of materials, specifically a disc-type Hopkinson torsion bar loading device based on electromagnetic force, and the device can be used as a separate Hopkinson torsion bar experiment loading device. Background technique [0002] Although Hopkinson tension and compression equipment has been widely used to measure the mechanical properties of materials under high strain rate compression and tension. However, both the compression rod and the tension rod adopt the axial loading method. When the compression and tension longitudinal waves propagate, the waveguide rod is accompanied by radial deformation, which produces a transverse inertia effect, resulting in wave dispersion and friction on the end surface of the sample, which affects the accuracy; and The torsional Hopkinson experimental equipment has no three-dimensional problems, no in...

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Problems solved by technology

In the patent application number 201510257557.8, the applicant proposed a Hopkinson torsion device with a cylindrical structure based on electromagnetic force, but the moment of inertia of the structure is relatively large, resulting in too long rising edge of the generated torsional wave, which can Limited range of torsion tests applied

In the present invention, the applicant invented a disk-type Hopkinson torsion device on the basis of the above-mentioned cylindrical Hopkinson torsion device. lack of time

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