A strain rate Hobkinson compression bar test device and method under pendulum loading

Abstract

Belongings to the technical field of rock dynamics, the invention relates to a pendulum load intermediate strain rate split Hopkinson pressure bar test device and a method. According to the invention, the hammerhead impact speed can be controlled by adjusting the pivot angle of a pendulum, thus realizing same dynamic stress wave loading under an intermediate strain rate loading condition. The device comprises a pendulum bracket that is provided with a pendulum; a calibration support is arranged on one side of the pendulum bracket, an incident bar and a transmission bar are disposed on the calibration support, and the incident bar, the transmission bar and the hammerhead axis are on one straight line; the incident bar and the transmission bar are provided with strain foils, which are in connection with the input end of an oscillographic recorder through pre-signal amplifiers, and the output end of the oscillographic recorder is connected to a computer. The method includes: adjusting the height and position of the calibration support, and ensuring alignment of the incident bar, the transmission bar and the pendulum hammerhead centere; making a sample clamped between the incident bar and the transmission bar; adjusting the pendulum pivot angle according to a required hammerhead impact speed; and releasing the pendulum to conduct an impact test, and recording and storing test data.

Description

technical field [0001] The invention belongs to the technical field of rock dynamics, and in particular relates to a pendulum loading medium strain rate Hobkinson compression bar test device and method, which are suitable for studying the mechanical properties of materials under dynamic medium strain rate impact loading conditions. Background technique [0002] In many human activities such as mining, water conservancy, transportation, and civil air defense, as well as natural disasters such as earthquakes and landslides, rocks or rock masses are affected by impact loads and related rock dynamics. At present, blasting technology has been widely used in geotechnical engineering fields such as mining, tunnel excavation, and construction of water conservancy and hydropower facilities. Large-scale and frequent blasting operations have caused varying degrees of damage to the surrounding rock of the project and other nearby non-blasting targets. ; At the same time, these human pro...

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Problems solved by technology

[0004] Based on these technologies, SHPB (Split Hopkinson Press Sure Bar) test devices with different loading methods have appeared. Since most of the current SHPB test devices use air cannon loading, it is difficult to accurately control the speed at which the punch impacts the incident rod. 2 ~10 4 the s -1 High strain rate loading between

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