Device for rapid-heating quasi-static high-temperature Hopkinson pressure bar experiment

Abstract

The invention discloses a device for a rapid-heating quasi-static high-temperature Hopkinson pressure bar experiment. The device adopts the technical scheme that a sample is mounted in the middle of a ceramic sleeve at the center of a high-frequency induction heater in a shielding cover; the both ends of the sample are connected with the inner ends of two short ceramic bars; the outer ends of the two short ceramic bars are connected with one end of an incidence bar and one end of a transmission bar respectively; stress wave signals of strain gages are measured from the incidence bar and the transmission bar respectively, and sent to a computer for data processing through an electric bridge and an amplifier; the computer controls the warming of the high-frequency induction heater and the sample through a temperature controller; and the sample temperature is fed back to the temperature controller by another infrared monitor. The device overcomes the defects that the available device for the split Hopkinson pressure bar experiment is complicated in structure, complicated to operate, low in working efficiency and difficult in data processing; and the quality of the experiment is influenced seriously. The device is suitable for the Hopkinson pressure bar experiments in different laboratories, in particular to the heating of the sample and the immediate processing of the information of the strain gages.

Description

technical field [0001] The invention relates to a fast-heating type quasi-static high-temperature Hopkinson compression rod experimental device. Background technique [0002] The existing split Hopkinson (Hopkinson) compression bar experiment is considered to be an effective method for studying the dynamic mechanical properties of materials. SHPB's high-temperature experiment law is roughly divided into two types: one is to put the sample and part of the probe into the temperature box and heat it at the same time. Xia Kaiwen et al., Experimental Mechanics, 1998, Vol.13, No. 3, PP.307-313) used a constant temperature heating furnace, applied the one-dimensional stress wave propagation theory and heat transfer principle, and corrected the influence of the temperature gradient field on the waveform measurement. The defect is that the experimental data processing system is more complicated; the other is to heat the sample separately first, and quickly install the sample in the ...

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Problems solved by technology

SHPB's high-temperature experiment law is roughly divided into two types: one is to put the sample and part of the probe into the temperature box and heat it at the same time. Xia Kaiwen et al., Experimental Mechanics, 1998, Vol.13, No. 3, PP.307-313) used a constant temperature heating furnace, applied the one-dimensional stress wave propagation theory and heat transfer principle, and corrected the influence of the temperature gradient field on the waveform measurement. The defect is that the experimental data processing system is more complicated; the other is to heat the sample separately first, and quickly install the sample in the system before the experiment. , 2005, Vol.20, No. 2, PP.281-284) and an invention patent titled "Automatic assembly device with two-way double gas path for high-temperature Hopkinson compression bar experiment" (patent number: ZL200610021096.5) , described that the device can ensure the stability of the assembly, etc., and its defect lies in the quasi-static docking and synchronization of the system, which has high precision requirements for the experimental device; in addition, the invention patent (patent number: ZL201010230523.7) and utility model The patent (patent number: ZL201020263456.4) discloses a high-temperature Hopkinson pressure bar experimental system with an atmosphere protection device, which can perform high-temperature dynamic experiments in conventional air and can provide a protective atmosphere. Complex, and the sample is heated alone or the sample is heated together with part of the probe, it is inevitable that there will be a local temperature rise of the rod, so that plastic deformation occurs under the impact, which has a greater impact on the transmission of the stress wave

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