Dual-rod symmetrically load application method for measuring critical force of pressure lever with a fixed end and a free end
A technology of critical force and compression rod, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems that the vibration method is difficult to apply, the compression rod cannot produce lateral free vibration, and the vibration method cannot be applied, etc.
Inactive Publication Date: 2008-02-06
ZHEJIANG UNIV
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Problems solved by technology
However, for a compression bar with one end fixed and one end free, the vibration method is difficult to apply
Because the pressure loading method adopted in the existing experimental technology is that the loading head is in sliding contact with the free end of the pressure rod, so as to ensure that when the axial pressure is applied to the pressure rod, the free end can be displaced laterally. However, the distance between the loading head and the free end of the pressure rod The characteristic of sliding contact prevents the bar from generating the lateral free vibration required by the vibration method
If the tension loading method is adopted, the lateral displacement of the free end will inevitably be affected by the loading connecting parts, so that the restraint nature of the free end is completely changed, and the compression rod is no longer a compression rod with one end fixed and one end free, and the vibration method is naturally cannot be applied
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[0012] Referring to Fig. 1, the dual-rod symmetrical loading method for measuring the critical force of a free compression rod with one end fixed and one end free according to the present invention adopts two compression rods 1 and 2 with the same material, section and length, and makes the two compression rods be in a coaxial position on; the two depression bars can be in the vertical position or in the horizontal position (illustrated according to the vertical position below); the lower end of the first compression bar 1 is fixed on the lower support 6 of the frame 3, and the The upper end of the second pressing rod 2 is installed in the sliding guide rail of the upper support 7 of the frame 3, so that it can move along the axial direction of the pressing rod; the upper end of the first pressing rod 1 and the lower end of the second pressing rod 2 are both The free end of the two compression rods is matched in an appropriate form to form a smooth hinge; the upper end of the s...
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The present invention discloses a double pole symmetrical loading method of the critical force of a pressing pole with a fixed end and a free end. Two pressing poles with the same material, cross section and length are adopted, and the two pressing poles are at coaxial positions, one end of the first pressing pole is fixed on a supporting seat on one side of a framework, one end of the second pressing pole is arranged in the slide rails of the supporting seat on the side opposite to the framework, to make the end move along the axial direction of the pressing pole, the other end of the first pressing pole and the other end of the second pressing pole are respectively free ends, the free ends of the two pressing poles are connected through a smooth steel ball or a hinge structure, and through the axial load applied by the second pressing pole on the two pressing poles, the critical force of the pressing pole can be measured in both a dynamic test method and a static test method. The present invention is characterized in that a vibration method can be effectively used to measure the critical force of the pressing pole with a fixed end and a free end.
Description
technical field [0001] The invention relates to an experimental method for measuring the critical force of a compression rod, in particular to an experimental method for measuring the critical force of a compression rod with one end fixed and one end free through symmetrical loading of two rods, and belongs to the technical field of engineering mechanics testing. Background technique [0002] The stability of compression rods (stability of compression rods) is one of the basic factors that determine the safety of engineering structures such as machinery and buildings, and is also one of the basic issues in engineering mechanics research. method. The compression bar stability test method can be divided into static and dynamic two. The static method is to apply axial pressure to the compression rod, measure the relationship between the pressure and the deflection of the compression rod, and determine the critical force of the compression rod from this curve. The static metho...
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Inventor 鲁阳张秋华赵树山
Owner ZHEJIANG UNIV