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Variable-bar-diameter Hopkinson pressure bar experimental device and method

A Hopkinson pressure bar and experimental device technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of high cost of SHPB devices, waste of laboratory land resources, and increased economic costs, and achieve significant scientific research and engineering. Application significance, easy installation, and the effect of reducing experimental errors

Pending Publication Date: 2019-12-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can meet the testing needs, due to the high cost of the SHPB device and the large footprint, it is easy to double the economic cost. serious waste of

Method used

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  • Variable-bar-diameter Hopkinson pressure bar experimental device and method
  • Variable-bar-diameter Hopkinson pressure bar experimental device and method
  • Variable-bar-diameter Hopkinson pressure bar experimental device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Step 1: Place the incident rod 5, the transmission rod 9 and the absorption rod 11 made of high-strength silicon-manganese steel with a diameter of 100 mm and a length of 4000 mm, 4000 mm and 1000 mm respectively in the three-jaw chuck 6, between the three-jaw chuck 6 Keep an appropriate distance between them, such as 800mm, to reduce the influence of the self-weight of the experimental rod on the experiment;

[0045] Step 2: Radially adjust the three-jaw chuck 6 through a pneumatic device (or manual adjustment valve 20), so that the incident rod 5, the transmission rod 9 and the absorption rod 11 are on the same axis and can slide smoothly;

[0046] Step 3: Paste the incident rod strain gauge 7 and the transmission rod strain gauge 10 at the central positions of the incident rod 5 and the transmission rod 9, and connect them with the ultra-dynamic strain gauge 13 and the oscilloscope 14, and ensure that the circuit is unobstructed;

[0047] Step 4: After the completion...

Embodiment 2

[0052] Step 1: The incident rod 5, the transmission rod 9 and the absorption rod 11 made of high-strength silicon-manganese steel with a diameter of 38mm and a length of 2000mm, 2000mm and 500mm are placed in the three-jaw chuck 6, and the three-jaw chuck 6 is kept between them. Appropriate spacing, such as 1000 mm, to reduce the influence of the experiment rod's own weight on the experiment;

[0053] Step 2: Radially adjust the three-jaw chuck 6 through a pneumatic device (or manual adjustment valve 20), so that the incident rod 5, the transmission rod 9 and the absorption rod 11 are on the same axis and can slide smoothly;

[0054] Step 3: Paste the incident rod strain gauge 7 and the transmission rod strain gauge 10 at the central positions of the incident rod 5 and the transmission rod 9, and connect them with the ultra-dynamic strain gauge 13 and the oscilloscope 14, and ensure that the circuit is unobstructed;

[0055] Step 4: After the completion of the step 3, carry ou...

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Abstract

The invention discloses a variable-bar-diameter Hopkinson pressure bar experimental device and a variable-bar-diameter Hopkinson pressure bar experimental method. The variable-bar-diameter Hopkinson pressure bar experimental device comprises a three-jaw chuck, a transmitting system, an experimental bar system and a data acquisition and processing system, wherein the launching system is composed ofan air pump, an air cylinder and a gun barrel; the experimental bar system is composed of an impact bar, an incident bar, a transmission bar and an absorption bar; the incident bar, the transmissionbar and the bar are sequentially centered and clamped by means of the three-jaw chuck; the three-jaw chuck is composed of a baffle plate, a pedestal, a pneumatic chuck body, radial moving pawls, rollers, a pneumatic adjusting air inlet and a manual adjusting valve; the pneumatic chuck is connected with the air pump by means of the pneumatic adjusting air inlet; the clamping end of each radial moving pawl is connected with the corresponding roller, and the incident bar, he transmission bar and the absorption bar can slide on the rollers; and a test sample is arranged between the incident bar and the transmission bar, an incident bar strain gauge is arranged on the incident bar, a transmission bar strain gauge is arranged on the transmission bar, and the incident bar strain gauge and the transmission bar strain gauge are both connected with the data acquisition and processing system.

Description

technical field [0001] The invention belongs to the field of rock dynamic testing. The invention relates to a Hopkinson compression bar experimental device and method for testing the dynamic mechanical properties and failure behavior of rock or concrete samples with different sizes. Background technique [0002] In civil engineering such as mining, geotechnical, water conservancy, transportation, civil air defense, etc., as well as natural disasters such as earthquakes and landslides, rocks, concrete or rock structures are affected by impact loads and related rock dynamics issues. Therefore, studying and mastering the dynamic mechanical properties of materials such as rock and concrete has very important scientific and engineering practical significance for the design, stability and safety assessment of rock mass engineering. [0003] The split Hopkinson pressure bar (SHPB) is one of the international standard test devices used to study the dynamic mechanical properties of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/307G01N3/02
CPCG01N3/307G01N3/02G01N2203/001G01N2203/0044
Inventor 邓稀肥朱建波周韬李瑞彭琦
Owner TIANJIN UNIV
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