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Hopkinson bar active pressure confining device for stabilizing pressure

A Hopkinson pressure bar, active technology, used in measuring devices, using stable tension/pressure to test material strength, instruments, etc., can solve the problem of increasing the size of the confining pressure device, increasing the difficulty of sealing, and limiting the size of the device. problems, to achieve the effect of small sealing difficulty, easy replacement and strong applicability

Inactive Publication Date: 2012-01-25
HOHAI UNIV
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Problems solved by technology

However, this method is affected by the following two factors: 1. The existing Hopkinson compression bar is affected by the distance between the bar and the support, and the size of the device is limited; 2. The increase in the size of the confining pressure device will increase Production costs increase the difficulty of sealing and the effect of voltage stabilization is poor

Method used

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  • Hopkinson bar active pressure confining device for stabilizing pressure
  • Hopkinson bar active pressure confining device for stabilizing pressure
  • Hopkinson bar active pressure confining device for stabilizing pressure

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Embodiment Construction

[0021] The specific embodiments of the present invention will be further elaborated below in conjunction with the accompanying drawings.

[0022] The invention includes an active confining pressure device 1 and a pressure stabilizing device 2 suitable for a 74mm Hopkinson bar. Confining pressure device 1 is composed of rubber interlayer 3, hydraulic oil chamber 4, snap ring 5, O-shaped rubber seal 6, etc.; The interface 7 on the active confining pressure device is connected with the pressure stabilizing device to form an integral sealed oil chamber. The hydraulic oil chamber is sealed by an O-shaped rubber seal, and the rubber interlayer is connected to the oil chamber through a snap ring to act as a sealed test piece. role. The incident rod 15, the test piece 14, and the transmission rod 16 also pass through the lower part. The oil outlet 9 and the oil inlet 8 are respectively located at the top of the upper and lower parts of the confining pressure device, and the interface...

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Abstract

The invention discloses a Hopkinson bar active pressure confining device for stabilizing pressure. The device adopts a mode of being opened and closed up and down and is convenient for the installation of equipment and exchange of parts. Pressure stabilizing equipment is arranged in the device. A constant pressure confining value can be provided, so that Hopkinson triaxial tests are more accurate. In a collision process, the deformation of a test component causes the variation of the volume of hydraulic oil in the pressure confining device, and the variation of the volume is transmitted to an oil cylinder by a high pressure oil pipe and absorbed by an air bag in the oil cylinder, so that constant pressure value can be provided by active pressure confining in a test process. The device has the characteristics of convenience for design and processing and simpleness for operation. The accuracy of test data is improved. The invention provides an efficient and simple active pressure confining test device.

Description

technical field [0001] The invention relates to a voltage-stabilized Hopkinson rod active confining pressure device, which belongs to the field of test devices. Background technique [0002] At present, with the in-depth research on the dynamic mechanical properties of materials under high strain rate and three-dimensional confining pressure, a feasible test device is urgently needed. The main test device currently used is the separate Hopkinson pressure bar and its supporting active confining pressure device. The active confining pressure device is a hydraulic device that pumps hydraulic oil into the oil chamber through the oil pump, and then applies pressure to the surrounding of the test piece through the rubber interlayer. The stability of the confining pressure is poor during the test. There are active confining pressure devices suitable for 37, 75, and 100mm Hopkinson pressure bars in China. Since the existing active confining pressure device adopts a left and right ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/02G01N3/12
Inventor 张华郜余伟刘亮武守峰徐威潘尘炜
Owner HOHAI UNIV
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