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Transmission rod for Hopkinson compression rod experiment and Hopkinson compression rod experimental device

A technology of Hopkinson compression rod and experimental device, which is applied in the direction of measuring device, using repeated force/pulsation force to test the strength of materials, instruments, etc., which can solve problems such as delay, elimination of reflected pulse, and larger size of transmission rod device. Achieve the effects of protection device, easy transportation and use, and short length

Active Publication Date: 2021-09-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current test device used in the test, because the reflection of the pulse in the transmission rod often affects the data measured on the strain gauge on the transmission rod. Although the method of lengthening the transmission rod can reduce the impact of pulse reflection, it cannot fundamentally eliminate it. The function of the reflected pulse can only play a delay effect, and at the same time the size of the transmission rod device has also become larger, reaching 1~2m

Method used

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  • Transmission rod for Hopkinson compression rod experiment and Hopkinson compression rod experimental device
  • Transmission rod for Hopkinson compression rod experiment and Hopkinson compression rod experimental device
  • Transmission rod for Hopkinson compression rod experiment and Hopkinson compression rod experimental device

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Experimental program
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Embodiment Construction

[0028] Now illustrate the embodiment of this experimental device in conjunction with accompanying drawing.

[0029] Such as figure 1 As shown, a transmission rod for Hopkinson compression bar experiment is provided with a transmission rod strain gauge 13. It is characterized in that the transmission rod is composed of a front cylinder 11 and a rear cylinder 12, and the front cylinder 11 and the rear cylinder 12 are integrally formed coaxial cylinders; the diameter of the front cylinder 11 is smaller than the diameter of the rear cylinder 12, and the through-rod strain gauge 13 is arranged on the front cylinder 11.

[0030] The free end surface of the cylinder 12 in the rear area is a concave curved surface.

[0031] The free end surface of the cylinder 12 in the rear area is an arc surface concave toward the center.

[0032] The front cylinder 11 has a diameter of 14 mm and an axial length of 13 mm; the rear cylinder 12 has a diameter of 100 mm and an axial length of 200 mm....

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Abstract

The invention provides a transmission rod for Hopkinson compression bar experiment, on which a strain gauge (13) is arranged, and the transmission rod is composed of a front cylinder (11) and a rear cylinder (12). District cylinder (11) and rear district cylinder (12) are integrally formed coaxial cylinders; the diameter of the front district cylinder (11) is less than the diameter of the rear district cylinder (12), and the strain gauge through the rod (13) is arranged on On the cylinder (11) of the front area. By dividing the transmission rod into two cylinders with different diameters, the front cylinder is the receiving zone—accepting the transmission pulse, and the rear cylinder is the absorption zone—absorbing the transmission pulse. After the transmission pulse reaches the free end surface of the cylinder in the absorption zone, due to the front zone The diameter of the cylinder is smaller than that of the rear cylinder, and the pulse reflected to the front cylinder is less, which greatly eliminates the influence of the pulse reflection in the transmission rod on the data measured on the strain gauge on the transmission rod.

Description

technical field [0001] The invention belongs to the field of material testing, in particular to a transmission rod for Hopkinson compression rod experiment and a Hopkinson compression rod experimental device. Background technique [0002] The Hopkinson pressure bar experimental device is used to test the stress-strain relationship of materials under high-speed deformation. In the test, the waveforms of the incident wave and reflected wave are obtained successively through the strain gauge on the incident rod, and the transmitted wave is obtained through the strain gauge on the transmission rod. waveform to measure the stress-strain relationship of the material. The current test device used in the test, because the reflection of the pulse in the transmission rod often affects the data measured on the strain gauge on the transmission rod. Although the method of lengthening the transmission rod can reduce the impact of pulse reflection, it cannot fundamentally eliminate it. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/38G01N3/02
CPCG01N3/02G01N3/38G01N2203/001G01N2203/005G01N2203/0075
Inventor 刘维曾小勇黄尚宇
Owner WUHAN UNIV OF TECH
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