Hopkinson pressure bar experimental apparatus

Abstract

The invention discloses a Hopkinson pressure bar experimental apparatus. The Hopkinson pressure bar experimental apparatus is characterized by comprising an electromagnetic trigger switch (1), a heating furnace door automatic opening switch (2), an electromagnetic driving device (3), a driving panel (4), a bullet (5), an incident pole (6), a force sensor (7), a heating furnace (8), a heating furnace supporting device (9), a transmitting pole (10), a buffer device (11) and an air compressing and filtering device (12); and the heating furnace is designed for preventing a test piece from being oxidized at a high temperature while heating the test piece and keeping the temperature of the test piece; as high temperature can influence the conduction of stress wave, the digital image correlation (DIC) technology is used for obtaining the change images of the test piece and analyzing the strain, the force sensor is used for analyzing stress, so as to obtain a stress strain curve. The Hopkinson pressure bar is combined with the electromagnetic driving technology and the DIC technology, and therefore the application range of the Hopkinson pressure bar experiment is expanded and a new method for acquiring dynamic parameters of high temperature materials is provided.

Description

technical field [0001] The invention belongs to the research field of high-temperature dynamic mechanical properties of materials, and in particular relates to a high-precision Hopkinson compression bar experiment device and testing method at high temperature, especially based on electromagnetic drive technology and DIC technology. Background technique [0002] The Hopkinson compression bar experiment is widely used in the research of material properties, but most of them are material experiments at room temperature, but high-temperature conditions also exist, so the research on material properties at high temperatures is also required. One of the research methods for the high-temperature dynamic performance of materials is to heat the specimen to the corresponding temperature before the experiment, and then quickly move it to the experimental device, so that the specimen is placed in the air, and the specimen is easily oxidized at high temperature. The temperature of the wo...

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is to provide a Hopkinson compression bar experiment device at high temperature, which can not only solve the heating problem of the specimen in the traditional Hopkinson compression bar experiment at high temperature, but also prevent the specimen from being oxidized at high temperature. Electromagnetic drive technology replaces the previous air cannon technology to improve the repeatability, safety, control accuracy and convenience of the injection rod launch mechanism, and then uses digital image correlation technology (DIC for short) to measure the strain of the test piece online to ensure the accuracy of the experiment

Images