Variable cross-section Hopkinson pressure bar device

A technology of Hopkinson pressure bar and variable cross-section, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of the difference in the initial velocity of the impacting projectile, the inability to completely remove the residual air pressure, and increase the number of experiments, so as to improve the experimental results. Accuracy, improved convenience and practicality, the effect of improved convenience

Pending Publication Date: 2020-04-03
SOUTHWEST JIAOTONG UNIV
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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 experim

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  • Variable cross-section Hopkinson pressure bar device
  • Variable cross-section Hopkinson pressure bar device
  • Variable cross-section Hopkinson pressure bar device

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[0038] Example

[0039] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

[0040] Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by tho...

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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...

Claims

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Application Information

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IPC IPC(8): G01N3/307
CPCG01N3/307G01N2203/0044G01N2203/0075G01N2203/0682
Inventor 朱志武马悦伏甜甜
Owner SOUTHWEST JIAOTONG UNIV
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