Strain gauge reinforcing device for Hopkinson pressure bar experiment
A technology of Hopkinson pressure rods and reinforcement devices, which is applied in the direction of measuring devices, strength characteristics, instruments, etc., can solve the problems of easy breakage at the welding point of wires and strain gauges, large impact load of strain gauges, etc., and facilitate the disassembly process , Reduce the frequency of replacement, the effect of good caulking performance
Pending Publication Date: 2018-02-16
HARBIN UNIV OF SCI & TECH
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Problems solved by technology
[0003] The invention provides a strain gauge strengthening device for the Hopkinson compression bar experiment, which can solve the following technical problems: Since the Hopkinson compression bar is in use, the strain gauge will be greatly affected by the impact of the bar at high speed. The impact load, if there is no corresponding protection measures, the welding between the wire and the strain gauge is very easy to break
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[0023] The principle and structural features of the present invention will be described below with reference to the accompanying drawings.
[0024] Method 1: attached image 3 The shown strain gauge reinforced shaft sleeve (1) is provided with a φ8 threaded hole (9), the outer diameter is φ12, and the length of the shaft sleeve is 8mm; a glue feeding hole (7) is opened on it, and the inner hole diameter Is φ2, the outer diameter is φ3, the distance from the center of the threaded hole (9) to the two end faces of the sleeve is 4mm, the height of the boss of the glue feeding hole (7) is 1mm, and the glue enters from the glue hole (7). It fills the gap between the bushing and the Hopkinson pressure rod (2); two vents (6, 8) are opened on it to accelerate the solidification process of the liquid glue. The diameter is φ1, and the threaded hole (9 ) The distance from the center to the center of the glue feeding hole (7) is 2.5mm.
[0025] Method 2: The axial glue sealing device (5) sho...
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The invention relates to a strain gauge reinforcing device for a Hopkinson pressure bar experiment. The strain gauge reinforcing device structurally comprises a strain gauge reinforcing shaft sleeve,an axial adhesive sealing device, an M type sealing ring and tightening screws and is characterized in that the strain gauge reinforcing shaft sleeve can completely cover a whole strain gauge and structurally comprises an adhesive feeding hole, and a liquid adhesive can enter a gap between the shaft sleeve and a shaft through the adhesive feeding hole to complete the wrapping process of the straingauge; the solidification process of the liquid adhesive is accelerated by ventilation holes in the strain gauge reinforcing shaft sleeve; overflow of the liquid adhesive can be prevented by the M type sealing ring inside the axial adhesive sealing device; the axial adhesive sealing device is coordinated with the tightening screws to clamp and position the whole device. The strain gauge reinforcing device for the Hopkinson pressure bar experiment has the advantages that fast drying of the adhesive is achieved, the solidified adhesive can still keep flexibility, and rigid impact generated by experiment collision can be resisted effectively; the device is removed after the adhesive is solidified, and accordingly the reinforcing of the strain gauge is achieved, experiment data accuracy is guaranteed, replacement times are reduced, and experiment efficiency is increased.
Description
Technical field [0001] The invention relates to the field of experimental research on the dynamic mechanical properties of materials, in particular to a strain gauge strengthening device used in the Hopkinson pressure bar experiment. Background technique [0002] In the Hopkinson pressure rod experiment, the impact rod collides with the incident rod, which will generate a compressive stress wave. When the stress pulse in the incident rod reaches the contact surface with the sample, a part of it is reflected, forming a reflected wave in the incident rod; The other part enters the transmission rod through the sample to form a transmission wave. Both the incident rod and the transmission rod need to be equipped with resistance strain gauges, through which the force state of the measured part is converted, in order to record the pulse signal that changes with time. The wire and the strain gauge are generally connected by brazing. The main component of the solder is tin-lead alloy, a...
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Login to View More IPC IPC(8): G01N3/02
CPCG01N3/02
Inventor 刘二亮魏旭东齐金王宁
Owner HARBIN UNIV OF SCI & TECH