Hopkinson beam rod dynamic testing system
A Hopkinson rod and dynamic testing technology, which is applied in the field of testing and research of mechanical properties and damage characteristics, can solve the problems of not being able to truly reflect the dynamic response and cannot be carried out, and achieve the elimination of dispersion effects and inertial effects, fast and accurate positioning The effect of centered installation
Active Publication Date: 2019-03-01
SHENZHEN UNIV
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Problems solved by technology
When testing the existing Hopkinson bar device, small-sized (usually sample diameter ≤ 50mm) samples are used. It is considered that the dynamic response of the test sample is isotropic and uniform, and cannot truly reflect the dynamic response of real rock, concrete and other materials.
In addition, the existing Hopkinson bar device technology can only carry out research on the dynamic characteristics of rock and concrete under one-dimensional impact loading or pre-added static confining pressure. However, in actual engineering, rock, concrete, etc. Materials are not only subjected to impact loads in one direction, but also impact loads in biaxial or triaxial and six directions. The existing device technology cannot carry out dynamic impact test research under such working conditions.
Method used
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[0020]The present invention will be further described below in conjunction with the accompanying drawings.
[0021] attached figure 1 It is a three-dimensional diagram of the Hopkinson beam beam system. The test device is placed on the horizontal cross support platform, which is composed of X + To support platform 1, X - To support platform 16, Y + To support platform 21 and Y - Consists of facing support platform 31 and center support platform 61. Center cube square case 59 upper surfaces (along Z + To) fully open, along the X + to, X - to, Y + to, Y - direction, and Z - A square opening is set at the middle position of the central cube box 59 respectively, and the size of the square opening is the same as the size of the beam bar; the center cube box 59 is placed in the center of the upper surface of the central support platform 61, and forms a positive The cross coordinate system is used for precise positioning and alignment of the three-axis six-direction beam be...
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The invention provides a Hopkinson beam rod dynamic testing system which comprises a horizontal cross support platform, a central cube square box, beam rods and a beam rod fixing and support frame. The beam rods in the X direction and the Y direction beam rod are horizontally placed, the beam rods in the Z direction are vertically placed, and the small single rods are symmetrically and neatly bundled by the beam fixing and support frame to form large square beam rods. The gap of 1 mm to 2 mm is reserved between the single rods, a resistance strain gauge is attached to each single rod, the cross-sectional area and the length of the beam rods in all the directions are the same, and the dynamic stress wave propagation law and the dynamic response signal monitoring mode of each beam rod are the same. The system overcomes the shortcoming that the existing Hopkinson rods cannot be used for performing dynamic mechanical property testing of large-sized rock or concrete materials, and and makesup for the defect that the local dynamic stress-strain response characteristics of a testing sample cannot be obtained effectively in the Hopkinson rod testing process.
Description
technical field [0001] The invention relates to the dynamic mechanical performance test of materials such as rocks, concrete, polymers, etc., in particular to the test and research of the mechanical properties and damage characteristics of large-scale materials under the condition of dynamic and static combined loading. Background technique [0002] At present, domestic and foreign studies on the dynamic characteristics of materials such as rock and concrete under impact loading mainly rely on Hopkinson rod devices. The existing Hopkinson rod devices at home and abroad are one-dimensional Hopkinson rods, conventional three-axis Kingson Rods, True Triaxial Rock Hopkinson Rods, and 1D Hopkinson Beam Rods. [0003] The existing Hopkinson bar device for testing the impact properties of rock, concrete and other materials at home and abroad has strict requirements on the size of the sample. Usually the diameter and length of the test sample are less than 50mm, and it is impossible...
Claims
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IPC IPC(8): G01N3/307G01N3/02G01N3/06
CPCG01N3/02G01N3/06G01N3/307G01N2203/0048G01N2203/0075G01N2203/0256
Inventor 谢和平赵坚朱建波周韬廖志毅
Owner SHENZHEN UNIV