A Cryogenic Experimental Apparatus for Hopkinson Rods

Abstract

The embodiment of the present invention discloses a low temperature experimental device for a Hopkinson rod. Including: box body, top cover, heat preservation unit, refrigerant unit, specimen storage unit, incident rod, transmission rod, detachable front cover, detachable rear cover and bottom cover, heat preservation unit accommodated in the box, specimen storage unit Set in the center of the box, the sealed space in the box between the heat preservation unit and the test piece storage unit forms a refrigerant unit. On the top and bottom of the box, there are respectively through holes with a size larger than the inner diameter of the test piece storage unit. Above the refrigerant unit On the top of the box, there is a refrigerant adding port, on the bottom of the box below the refrigerant unit, there are drainage holes, on both sides of the middle and lower part of the box, there are through holes, and there are holes in the through holes for accommodating the incident rod and The sealing tube of the transmission rod, the detachable front cover and the detachable rear cover are respectively used to seal the through holes on both sides of the middle and lower part of the box body. By applying the invention, the efficiency of low temperature experiment can be improved and the structure complexity can be reduced.

Description

technical field [0001] The invention relates to material performance experiment technology, in particular to a low-temperature experiment device for Hopkinson rods. Background technique [0002] The separated Hopkinson rod (Hopkinson rod) is an impact experimental device for studying the dynamic mechanical properties of engineering materials under one-dimensional stress state. It is widely used in metal materials, rocks, concrete, ceramics, polymers, and energetic materials. Research on the dynamic mechanical properties of various materials, such as foam materials, and the dynamic response and damage of material structures. [0003] The dynamic mechanical properties of engineering materials include the dynamic mechanical properties of engineering materials at low temperature and the dynamic mechanical properties of engineering materials at room temperature. When carrying out the split Hopkinson rod impact test under low temperature conditions, due to the high sensitivity of...

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Problems solved by technology

However, there is currently no refrigeration system specifically for the impact test device of the separated Hopkinson rod. Researchers generally use liquid nitrogen refrigeration to cool the test piece and the separated Hopkinson rod, and use thermal resistance or thermocouple to measure the temperature. , in order to detect whether the temperature required for refrigeration is reached, so that to use this method to conduct experiments, it is necessary to connect a liquid nitrogen circulation refrigeration system and adopt a suitable temperature control method, which will cause the entire refrigeration system to take a long time to refrigerate and reach a stable state. The efficiency is low, and the utilization rate of the refrigerant is not high; furthermore, the liquid nitrogen circulation refrigeration system is basically designed by itself according to the specific experimental requirements, and most of them are equipped with liquid nitrogen tanks, Dewar bottles, thermocouples, liquid (gas) The liquid refrigerant external circulation temperature control system of the tube, refrigeration box and temperature controller has a complex structure and high cost; moreover, because the separated Hopkinson rod impact experiment has the characteristics of intermittent experiment, short single experiment time and many experiments and other characteristics, and when conducting low temperature experiments, material specimens and experimental rods are highly sensitive to temperature. Therefore, how to effectively reduce the time required for refrigeration, reduce the unnecessary disturbance of the experiment on the specimens, and conduct experiments conveniently and quickly is hope Problems to be solved in low temperature experiment of Jinsen rod

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