Confining pressure loading device based on split Hopkinson pressure bar

Abstract

The present invention discloses a confining pressure loading device based on a split Hopkinson pressure bar. The device comprises an oil cylinder, an I-shaped support and a steel base, the oil cylinder is arranged on the I-shaped support, the I-shaped support is arranged on the steel base, an exhaust hole is formed in the top of the oil cylinder, and an oil inlet hole is formed in the bottom of the oil cylinder. The device further comprises a first sealing sleeve, a second sealing sleeve, an oil separation rubber pipe, an incident rod and a transmission rod, a first notch and a second notch are formed in the two sides of the oil cylinder respectively, the center axis of the first notch and the center axis of the second notch are collinear, and one end of the first sealing sleeve is connected with the first notch in a sealed mode; and one end of the second sealing sleeve is connected with the second notch in a sealed mode, and the two ends of the oil separation rubber pipe are connectedwith the first sealing sleeve and the second sealing sleeve in a sealed mode respectively. The test piece can be placed in the middle, it is guaranteed that the test piece makes tight contact with the oil separation rubber pipe, and the damaged test piece can be taken out of the oil separation rubber pipe conveniently.

Description

technical field [0001] The invention relates to the experimental field of dynamic mechanical performance testing of rock-like brittle materials at medium and high strain rates, in particular to a confining pressure loading device based on a separated Hopkinson compression bar. Background technique [0002] The experimental research on the mechanical properties, energy dissipation characteristics and damage evolution law of rock under dynamic load is an important prerequisite for rock mass excavation, support and stability analysis, and is an essential basic information in related engineering design and construction. and reference basis. Since Kolsky proposed the separated Hopkinson pressure bar (SHPB) device in 1949, the device has been widely used in the study of brittle materials such as rocks at medium and high strain rates (10 1 -10 3 the s -1 ) under the dynamic characteristics. Conventional SHPB device system is mainly composed of main equipment, launch system and ...

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Problems solved by technology

Because the existing confining pressure loading device does not consider this point, the damaged test piece is hindered when it is pushed to the sealing steel ring in the oil-proof rubber tube, and the damaged test piece cannot be smoothly taken out from the oil-proof rubber tube , the method of dismantling the confining pressure device is often used, but this solution is not only laborious, but also seriously affects the progress of the experiment

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