Positioning centering system and method for true three-axis Hopkinson pressure bar and positioning method

Abstract

The invention provides a positioning centering system and method for a true three-axis Hopkinson pressure bar. A positioning guiding centering box is a cube, and square holes are reserved on the six surfaces of the positioning guiding centering box, and the sizes of the square holes in the six surfaces are the same as the size of a square rod of a Hopkinson rod; the size of an inner cavity of thepositioning guiding centering box is the same as the size of a cubic sample, and the positioning guiding centering box is designed to be symmetrical four parts. The method comprises the steps that step 1, the positioning guiding centering box is assembled, step 2, the positioning guiding centering box is immediately placed in the center position of a central cube square box, and step 3, the three-axis six-direction pressure bar is quickly and precisely aligned with assisting of an infrared laser measuring instrument. Through structural design of the positioning guiding device box and the tubesquare box, the quick and precise positioning centering mounting of test materials such as rock and concrete can be ensured. According to the positioning centering method for the true three-axis Hopkinson pressure bar, quick alignment of the three-axis six-direction pressure bar can be ensured through an infrared laser measuring instrument auxiliary mounting system.

Description

technical field [0001] The invention relates to the field of testing the dynamic mechanical properties of materials such as rocks and concrete, and in particular to a device and method for precise positioning and centering of a true three-axis dynamic and static combined loading Hopkinson bar. Background technique [0002] At present, the research on the dynamic mechanical properties of materials such as rock and concrete at home and abroad mainly adopts the dynamic impact experiment research based on the Hopkinson bar system. The utility model with the patent No. 201620574575.9 provides a rock Hopkinson impact loading experimental device based on true triaxial static load. Although the device can realize the static true triaxial pre-loaded static pressure of the rock, the utility model patent does not solve the problem. Precise positioning and alignment of rock samples during installation. [0003] The Hopkinson impact loading experimental device based on true triaxial sta...

AI Technical Summary

Problems solved by technology

However, precise positioning and alignment is the core of the test system. The positioning center bracket in the utility model Hopkinson bar system with patent No. The test accuracy and the repeatability of the results; in addition, due to the imprecise and reliable alignment of the true triaxial compression rod, it is easy to cause eccentricity between the compression rod and the test sample, which may easily lead to compression during high-amplitude dynamic impact loading. The eccentric moment between the rod and the test specimen will damage the compression rod and cause unreliable test results

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