Variable cross-section Hopkinson pressure bar device

Abstract

The invention discloses a variable cross-section Hopkinson pressure bar device, and belongs to the field of impact dynamic mechanical property experiments. The device comprises an air pressure power system, a mounting frame arranged at the front end of the air pressure power system, a dynamic impact rod part system arranged on the mounting frame, a data collection system arranged on the dynamic impact rod part system, a safety protection system arranged on the side of the dynamic impact rod part system and a residual air pressure discharge system, according to the invention, a variable cross-section incident rod is not adopted in the experiment process; compared with an existing mode that an incident rod is manufactured into a variable cross-section rod, the diffusion effect is reduced, the shape and experiment precision of incident waves are prevented from being influenced by the diffusion effect, experiment protection measures are taken through a safety protection system, personnel safety is high. Meanwhile, residual air pressure is eliminated through a residual air pressure exhaust system, the experiment frequency is reduced, and experiment efficiency is improved.

Description

technical field [0001] The invention relates to the field of impact dynamic mechanical performance experiments, in particular to an experiment of impact dynamic mechanical properties. Background technique [0002] The Hopkinson compression bar is an important device for testing the properties of materials at high strain rates. It can verify the impact dynamic mechanical properties of materials by measuring the stress-strain characteristics of materials. It can play an important role in experiments on metals, frozen soil, concrete and other materials. effect. First of all, the diameter of the impacting projectile is difficult to change in the prior art, but the discretization of different test materials is different, so it needs to be made into cylindrical blocks with different diameters. However, if the incident rod is made into a rod with variable cross-section, it is easy to cause a dispersion effect, which not only affects the shape of the incident wave, but also require...

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Problems solved by technology

However, this method cannot completely remove the residual air pressure, especially the residual air pressure in the air pressure chamber, resulting in the same readings in the pressure gauges of the two experiments, but there is a certain difference in the initial velocity of the impacting projectile, which leads to the fact that in order to obtain the same initial velocity, tends to increase the number of experiments

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