Experimental device for automatically loading impacts on SHPB (Split Hopkinson Pressure Bar) at high temperature

Abstract

The invention discloses an experimental device for automatically loading impacts on an SHPB (Split Hopkinson Pressure Bar) at a high temperature. The experimental device comprises a high-pressure air cylinder, an incident bar, a transmission bar, a base for the placement of the incident bar, the transmission bar and a test piece, and a test piece heater, wherein the test piece heater and the base are separately arranged; width-adjustable test piece guide rails for guiding the test piece from the test piece heater to the base are arranged between the test piece heater and the base; test piece baffle rods for limiting the test piece are arranged on one side of the test piece which is opposite to the base and the test piece guide rails; three-dimensional regulation of the base can be achieved. According to the adopted experimental device for automatically loading the impacts on SHPB at the high temperature, the test piece is uniformly heated, the experiment process is accurate, and the stability is high.

Description

[0001] technical field [0002] The invention relates to the research field of high-temperature dynamic mechanical properties of materials, in particular to a SHPB automatic impact loading test device for rods under high-temperature conditions. Background technique [0003] The experimental device represented by the Split Hopkinson Pressure Bar (SHPB) device is currently the main device for measuring various dynamic mechanical properties of materials, which can obtain various dynamic mechanical parameters of materials under high strain rates. With the continuous development of science and technology, it is more important to measure the dynamic mechanical property index of materials under high temperature and high strain rate conditions (such as fire, explosion, earthquake). Due to the material characteristics of concrete and rock, large-sized Hopkinson pressure rods should be used to measure their dynamic mechanical parameters. At present, the high-temperature separate H...

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Problems solved by technology

[0006] In order to prevent the rapid cooling of the test piece away from the heat source, the assembly device sets the heating furnace directly below the assembly position of the test piece, resulting in uneven heating of the test piece, and is not suitable for heating large-sized test pieces, and the heating efficiency is low; in addition, Since the flight time of the projectile is different under different gas pressures, and the action time of the support is also different under different pushing pressures, so this device is likely to cause the test piece not to be in complete contact with the incident rod and the transmission rod, and the entire impact process has ended. Inaccurate, poor stability, and even lead to the failure of the entire experiment

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