Hopkinson dynamic experiment device for exciting controllable waveform by hydraulic servo testing machine

A technology of hydraulic servo and experimental equipment, which is applied in the direction of measurement equipment, nuclear power generation, climate sustainability, etc., and can solve problems such as the inability to accurately control the input stress wave waveform, the unstressed state, and the inversion of the rupture model waveform.
CN114577640APending Publication Date: 2022-06-03CHINA COAL RES INST
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA COAL RES INST
Publication Date
2022-06-03

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Abstract

The invention provides a Hopkinson dynamic experiment device with controllable waveform excited by a hydraulic servo testing machine, which comprises a hydraulic servo dynamic load testing machine, a position adjusting mechanism, a Hopkinson incident bar, a Hopkinson transmission bar and a dynamic strain gauge, and is characterized in that a loading disc of the testing machine is arranged in the position adjusting mechanism, and a loading impact shaft is arranged on the loading disc; one end of the Hopkinson incident bar is connected to the loading impact shaft, an experimental sample is mounted between the Hopkinson transmission bar and the Hopkinson incident bar, strain gauges are arranged on the outer walls of the Hopkinson transmission bar, the Hopkinson incident bar and the experimental sample, the dynamic strain gauge is connected with the strain gauges, and the dynamic strain gauge is connected with the Hopkinson transmission bar and the Hopkinson incident bar. According to the method, specific waveform excitation and introduction are realized, stress wave propagation and action processes are truly reduced by virtue of the advantages of a transmission system of the Hopkinson bar, residual wave reflection and oscillation effects are effectively avoided, a relation between stress waves and impact energy is established, and waveform inversion is performed on a fracture behavior of an experimental sample under the action of dynamic impact.
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Description

technical field

[0001] The application relates to the technical field of dynamic fracture experiments of samples, in particular to a Hopkinson dynamic experimental device for exciting a controllable waveform by a hydraulic servo testing machine. Background technique

[0002] The traditional hydraulic servo dynamic testing machine can realize the specific waveform loading of the sample to be tested, that is, the waveform loading method can be controlled. However, due to the complex fixing and loading structure of the traditional testing machine, and the design does not consider the problem of transmission and absorption of the after-wave after the controllable waveform passes through the sample to be tested, resulting in a large number of after-wave reflections of the traditional testing machine into the sample to be tested, and in the sample Multiple shocks cause additional dynamic loading effects that do not match the preset loading conditions. Therefore, the input wavefor...

Claims

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