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

Abstract

A strain rate Hopkinson compression bar test device and method during pendulum loading, belonging to the field of rock dynamics technology. The invention can control the impact speed of the hammer head by adjusting the swing angle of the pendulum to achieve the same dynamic stress wave loading under medium strain rate loading conditions. Device: includes a pendulum bracket, a pendulum is set on the pendulum bracket; a calibration support is set on one side of the pendulum support, and the incident rod and transmission rod are placed on the calibration support, and the axis of the incident rod, transmission rod and hammer head is On the same straight line; there are strain gauges on the incident rod and transmission rod. The strain gauges are connected to the input end of the oscilloscope recorder through the pre-signal amplifier, and the output end of the oscilloscope recorder is connected to the computer. Method: Adjust the height and position of the calibration support to ensure that the centers of the incident rod, transmission rod and pendulum hammer are aligned; clamp the sample between the incident rod and transmission rod; adjust the pendulum according to the required hammer head impact speed Pendulum angle; release the pendulum to conduct impact test, record and store 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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