Flywheel Hopkinson torsion bar device

Abstract

The invention provides a flywheel-type Hopkinson torsion bar device, which relates to the field of experimental equipment for dynamic mechanical properties of materials, and mainly includes a rotating drive device, an active flywheel, an electromagnetic attraction device, a ferromagnetic flywheel, a flange, a torsion incident rod, Twist the transmission rod, the driving flywheel and the flange are respectively arranged on both sides of the ferromagnetic flywheel; the two sides of the driving flywheel opposite to the ferromagnetic flywheel are respectively provided with friction plates, and the two sides of the flange opposite to the ferromagnetic flywheel are respectively provided with The friction plate; the driving flywheel is connected with the rotary drive device through the driving wheel shaft, the flange is connected with the torsion incident rod, and the test piece is installed between the torsion transmission rod and the torsion incident rod. The invention completely makes up for the defects of the existing pre-storage type separated Hopkinson torsion bar in the loading process, and the defect that the T-shaped Hopkinson torsion bar device generates complex bending waves in the conversion device, greatly reducing the The difficulty of the experiment is reduced, and the efficiency of the experiment is greatly improved.

Description

technical field [0001] The invention relates to the field of experimental equipment for dynamic mechanical properties of materials, in particular to a flywheel type Hopkinson torsion bar device. Background technique [0002] Split Hopkinson rod is an effective experimental device for studying the dynamic mechanical properties of materials under one-dimensional stress state. Since Kolsky invented the separate Hopkinson compression rod device in 1949 and used it to study the dynamic mechanical properties of materials under one-dimensional stress state, the dynamic compression experiment technology has been continuously improved. For some materials, their dynamic tensile properties are more important than their dynamic compressive properties, and split Hopkinson tie rods have also been greatly developed. However, sometimes researchers are more concerned about the dynamic shear resistance of materials, so in the 1970s T. Nicholas et al. invented the pre-storage separated Hopkin...

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Problems solved by technology

[0005] In 2013, Jiang Xiquan and others invented the T-shaped separated Hopkinson torsion bar. This invention almost overcomes all the shortcomings of the pre-storage torsion bar. However, due to its structure, complex bending waves are inevitably generated in the conversion device. , this bending wave is difficult to eliminate and will be introduced into the torsional incident rod

In addition, for a torsion bar with a large diameter (such as 1000mm), it takes a long time for the wave to propagate on the cross section of the bar and reach uniformity. steep, affecting the increase in experimental strain rate

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