DYNAMIC AND STATIC LOAD SYNCHRONOUS SERVO CONTROL SYSTEM FOR THREE-AXIS SIX-DIRECTION HOPKINSON PRESSURE BAR

摘要

Provided is a dynamic and static load synchronous servo control system for a three-axis six-direction Hopkinson pressure bar, wherein a square bar (10, 21, 34, 43, 53, 60) is fixed by a self-lubricating square bar and a support frame (11, 18, 33, 44, 52, 55), and the square bar (10, 21, 34, 43, 53, 60) is in centring connection with a central cube square box (63) in a square opening; a confining pressure loading hydraulic cylinder (2, 24, 45) and a confining pressure loading actuator (2, 27, 46) are combined with a confining pressure loading frame (7, 31, 47) in series; an electromagnetic pulse excitation chamber (6, 14, 29, 40, 49, 57) is placed in the confining pressure loading frame (7, 17, 31, 37, 47, 58) and is freely and tightly fitted with an incident end of the square bar (10, 21, 34, 43, 53, 60); and the confining pressure loading frame (7, 17, 31, 37, 47, 58) is connected to a boss (8, 20, 32, 42, 51, 61) in series, and the boss (8, 20, 32, 42, 51, 61) is disposed at the incident end of the square bar (10, 21, 34, 43, 53, 60). The arrangement of the boss (8, 20, 32, 42, 51, 61) can ensure that the incident end of the Hopkinson pressure bar is a free end after a test sample (64) is subjected to a static confining pressure, the problem of being unable to ensure the free state of the end of a Hopkinson incident bar after static pre-stress 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 an ultrasonic test under in-situ pressure maintenance conditions.