Reciprocating double synchronous assembly system based on hopkinson pressure rod

Abstract

A Hopkinson pressure rod-based reciprocating dual-synchronous assembling system is characterized in that the output port of a synchronous air chamber is connected with the input port of a three-way synchronous emission valve, and two output ports of the three-way synchronous emission valve are respectively connected with two input ports of a synchronous hand-operated valve. Two output ports of the synchronous hand-operated valve are respectively connected with a pushing air tube and a return air tube. A loading end at one end of an incident rod and a loading end at one end of a transmission rod are respectively arranged in through holes at two sides of a heating furnace, and the incident rod and the transmission rod are coaxial. The system cooperates with the Hopkinson pressure rod-based heating furnace, so a sleeve tube is simple and fast to install, and accurate alignment and intact contact of guide rods with different diameters and a sample are realized. The system can realize 1600 DEG C ultrahigh temperature, aerobic and anoxic environment, has the characteristics of stable heating and good heat insulation performance, and allows experiment images in high-speed dynamic experiments to be obtained through the observing window of the heating furnace.

Description

technical field [0001] The invention relates to a testing device for ultra-high temperature dynamic mechanical properties of materials, in particular to a reciprocating double-synchronous assembly system based on Hopkinson pressure rods. Background technique [0002] At present, the Hopkinson rod is mainly used to measure the mechanical properties of samples at room temperature and relatively low temperature, but in practical applications, especially in the field of aerospace, the mechanical properties and failure process of materials are generally in a state of ultra-high temperature, so Understanding the mechanical response characteristics of materials under ultra-high temperature conditions has become a research hotspot in related fields. To conduct high-temperature tests, one method is to place the entire test system in a high-temperature environment, and the other method is to locally heat it. In the Hopkinson rod test, it is not only very difficult but also inappropri...

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Problems solved by technology

[0005] However, there are some shortcomings in this method: the contact time between the sample and the transmission rod is much longer than that of the incident rod, which has a great influence on the temperature of the sample and the transmission rod, which is likely to cause experimental errors; in ultra-high temperature experiments, generally When using a larger heating furnace, in order to ensure the success rate of synchronization, it is necessary to use a piston with a long stroke and increase the movement speed of the piston, so that the momentum of the transmission rod is very large, which will form an impact load on the sample, and the momentum Too large will also make the synchronous assembly unstable; secondly, due to the high air pressure used to launch the bullet, the transmission rod will move too fast towards the incident rod when the synchronization system is driven, and the transmission rod will tend to rebound when the assembly is completed, making it In addition, when performing a dynamic experiment at a temperature of 1600 ° C, this solution cannot achieve the fixation of the sample under long-term heating conditions, and it is very easy to heat the loading rod, resulting in the failure of the device. damage

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