Magnetically-driven Hopkinson pressure lever testing device

Abstract

The invention discloses a magnetically-driven Hopkinson pressure lever testing device, which comprises a rack, a magnetically-driven module, an impact measurement component and a data collecting and processing module, wherein the rack comprises a fixed base and supporting seats which are distributed in a straight line shape and are installed on the fixed base; the magnetically-driven module comprises a stator, a rotor and a control system, wherein the stator is fixedly connected to the rack, and the rotor is assembled on a sliding rail in a stator inner hole; and the impact measurement component consists of a knock lever, an incident lever, a transmission lever and a buffer stop dog, wherein the knock lever, the incident lever, the transmission lever and the buffer stop dog are all assembled on the supporting seat. By use of the device, a high-accuracy high-strain-rate material dynamic mechanics performance test can be realized, the problems in a traditional air cannon type Hopkinson pressure lever testing process that air compression is long in time and large in noise, knock energy is unlikely to be accurately controlled and a knock lever is inconvenient in returning after testingis finished can be solved, Hopkinson pressure lever testing accuracy can be greatly improved, testing time is shortened, and testing efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of material dynamic mechanical performance testing, and in particular relates to a magnetically driven Hopkinson pressure bar testing device. Background technique [0002] The Hopkinson compression bar test technology was proposed by Hopkinson in 1914, and it could only be used to measure the pulse waveform under the impact load. In 1949, Kolsky improved the device by dividing the compression rod into two parts and placing the sample in it, so that the stress-strain relationship of the material under impact load can be measured. Because this device uses a split structure, it is called a split Hopkinson strut. The theoretical basis of Hopkinson's compression bar testing technology is the one-dimensional stress wave theory, and the stress-strain relationship of the sample material is deduced by measuring the strain on the compression bar. At present, it has been developed as the most important test method to...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a magnetically driven Hopkinson compression bar testing device for some defects in the prior art, which uses a magnetic drive to quickly accelerate the impact bar without an air compressor, providing The test conditions for dynamic mechanical properties of materials in the high strain rate range solve the problems of long time-consuming compressed air, high noise, difficult control of the impact energy speed and inconvenient return of the impact bar after the test is completed, which can improve the test accuracy of the Hopkinson pressure bar and shorten the test time. Test time, improve test efficiency

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