Dynamic and static load synchronous servo control system for three-axis six-direction Hopkinson pressure bar

Abstract

The invention provides a dynamic and static load synchronous servo control system for a three-axis six-direction Hopkinson pressure bar. A square bar is fixed by a self-lubricating square bar and fixed by a support frame, and the square bar and a central cube square box are in centering connection in a square opening. A confining pressure loading hydraulic cylinder and a confining pressure loadingactuator are combined with a confining pressure loading frame in series, an electromagnetic pulse excitation chamber is placed in the confining pressure loading frame and freely and tightly fitted with the incident end of the square bar, the confining pressure loading frame and a boss are connected in series, and the boss is placed at the incident end of the square bar. The setting of the boss can ensure that the incident end of the Hopkinson pressure bar is a free end after a test sample is subjected to static confining pressure, the problem that the free state of the ends of a Hopkinson incident bar and a transmission bar cannot be ensured after the static prestress is applied in the traditional dynamic and static combination Hopkinson bar system is solved, and test conditions are provided for subsequent application of electromagnetic excitation stress pulses and ultrasonic testing under in-situ pressure maintenance conditions.

Description

technical field [0001] The invention relates to dynamic mechanical performance testing of materials such as rocks, concrete, polymers, etc., and in particular to a mechanical performance testing system for materials under dynamic and static combined loading conditions based on Hopkinson rods. Background technique [0002] Existing dynamic test devices for materials such as rock and concrete have one-dimensional Hopkinson rods, three-axis Hopkinson rods for dynamic and static combined loading, one-dimensional Hopkinson beam rods, and rock Hopkinson rods based on true three-axis static loads. . Based on the research method of the dynamic characteristics of rock, concrete and other materials based on the Hopkinson rod device, the loading method is only one-dimensional impact loading at first, and then there is one-dimensional impact loading with pre-applied static confining pressure. [0003] In complex engineering problems, materials such as rocks and concrete are often subje...

AI Technical Summary

Problems solved by technology

However, the triaxial Hopkinson bar test under unidirectional impact loading cannot truly reflect the dynamic mechanical behavior of rocks, concrete and other materials under multi-directional simultaneous or delayed impact loading, which is a technical problem that the existing devices urgently need to overcome.

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