Fast heating device for high-temperature split Hopkinson pressure bar experiment

Abstract

A fast heating device for a high-temperature split Hopkinson pressure bar experiment is characterized in that a support trolley is disposed outside a shielding cover, a high-frequency induction heater is disposed in the shielding cover, a ceramic sleeve is disposed at the center of the heater, a testing object is disposed at the center of the sleeve, two ends of the testing object are connected with inner ends of two short ceramic rods respectively, the outer ends of the two short ceramic rods connected with one of a incidence rod and one end of a transmission rod respectively, and strain foils are attached to the incidence rod and the transmission rod respectively to realize synchronous computer data processing. The defects that testing objects of the existing heating devices for the split Hopkinson pressure bar experiments are heated independently, heating and impacting are separated, system quasi-static butting and synchronous precision are difficult to meet the requirements, the existing heating devices are complex in structure, complicated to operate, low in work efficiency, and high in data processing difficulty, and quality and precision of the split Hopkinson pressure bar experiments are affected severely and the like are overcome. The fast heating device is applicable to split Hopkinson pressure bar experiments of various labs, and especially applicable to heating of metal testing objects and instant data processing of strain foil information in a split Hopkinson pressure bar experiment device.

Description

technical field [0001] The invention relates to a rapid heating device for high-temperature Hopkinson pressure bar experiment. Background technique [0002] The existing Hopkinson (Hopkinson) compression rod experiment heating device and method are considered to be an effective method for studying the dynamic mechanical properties of materials. The methods for heating the test piece mainly include resistance (electric furnace) heating and direct combustion (fire) heating. The defects of using this method of heating are: slow heating speed and serious surface oxidation. The traditional SHPB high-temperature experiment method is roughly divided into two types: one is to put the test piece and part of the probe into the temperature box and heat it at the same time. The article (Xia Kaiwen et al., Experimental Mechanics, 1998, Vol.13, No. 3, PP.307-313) uses a constant temperature heating furnace, uses one-dimensional stress wave propagation theory and heat transfer principle, ...

AI Technical Summary

Problems solved by technology

The methods of heating the test piece mainly include resistance (electric furnace) heating and direct combustion (fire) heating. The defects of using this method of heating are: slow heating speed and serious surface oxidation

The traditional SHPB high-temperature experiment method is roughly divided into two types: one is to put the test piece and part of the probe into the temperature box and heat it at the same time. The article (Xia Kaiwen et al., Experimental Mechanics, 1998, Vol.13, No. 3, PP.307-313) uses a constant temperature heating furnace, uses one-dimensional stress wave propagation theory and heat transfer principle, and corrects the influence of temperature gradient field on waveform measurement , the difficulty lies in the complexity of the experimental data processing; the other is to heat the specimen separately first, and quickly install the specimen in the system before the experiment. Mechanics, 2005, Vol.20, No. 2, PP.281-284) and the invention patent titled "Automatic assembly device with two-way double gas path for high-temperature Hopkinson compression bar experiment" (patent number: ZL200610021096.5 ) describes a Hopkinson experimental two-way double-gas path automatic assembly device. Its defect is that it is difficult to realize the quasi-static docking and synchronization of the system, and requires a very high-precision experimental device.

In addition, the invention patent (patent: ZL201110189838.6) titled "Heating Device for Hopkinson Compression Bar Test" describes a tubular heating device capable of moving in three directions; After heating to the predetermined temperature, it is also necessary to push the incident rod and the transmission rod to the predetermined position. Although the specimen is kept warm, the rod is also heated, so that the local temperature of the rod also rises, and the local rod also occurs under the impact. Plastic deformation, so that the transmission of the stress wave entrains the plastic deformation content of the rod, which seriously affects the quality level and accuracy of the Hopkinson compression rod experiment

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