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Beam structure vibration fatigue device

A vibration fatigue and beam structure technology, applied in the field of fatigue testing machines, can solve the problems of inability to implement equipment, inability to easily change the restraint mode, etc., and achieve the effect of small distortion

Pending Publication Date: 2021-03-02
SHAOGUAN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest feature of this kind of fatigue testing machine is that it can obtain a large amplitude. However, due to the limitation of the structural shape, it is often designed to only complete the fatigue test of a single cantilever beam structure, and it is not convenient to change the restraint mode. It is used for beams of other restraint types. Structural fatigue testing, e.g. simply supported beams, beams fixed at both ends
That is to say, at present, the structure of the existing beam structure fatigue test device can generally only complete the fatigue test of a single cantilever beam structure, and it is impossible to realize the vibration fatigue test of various beam structure types with one device

Method used

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  • Beam structure vibration fatigue device
  • Beam structure vibration fatigue device
  • Beam structure vibration fatigue device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] from figure 1 It can be seen that the beam structure vibration fatigue device shown in the first embodiment includes a base 1, a support column 11, a vibration isolation spring 2, a vibration platform 3, a support joint 31, a beam end clamping seat 4, a beam specimen 5, a vibration motor6. Four T-shaped support columns 11 are welded on the four corners of the base 1, the vibration isolation spring 2 is a metal helical column compression spring, the support column 11 is welded to the bottom coil of the vibration isolation spring 2, and the top coil of the vibration isolation spring 2 is The support joint 31 is welded. recombine as figure 2 It can be seen that the support joint 31 includes three parts, the middle is a disc 312, and the two ends are respectively a spring guide post 311 and a support column 313. The top coil of the support spring 2 passes through the spring guide post 311 and is welded on the bottom surface of the disc 312. The top surface of the suppor...

Embodiment 2

[0051] Such as Figure 8 As shown, the difference between the second example and the first example lies in the structural shape and clamping method of the beam test piece, and the additional counterweight 7 . combine Figure 9 It can be seen that the top and bottom surfaces of one end of the beam specimen are planes, and the top and bottom surfaces of the other end are also planes. recombine Figure 10, a central through hole 52 is opened at the middle position of the beam test piece 5 . In order to increase the inertial excitation force, a counterweight 7 is installed on the beam specimen. The counterweight includes an upper counterweight 71 and a lower counterweight 72. The upper counterweight 71 and the lower counterweight 72 have the same structural shape and size. Both the counterweight 71 and the lower counterweight 72 have five through holes, among which four are at the four corners and one is at the middle. The upper counterweight 71 is installed above the beam tes...

Embodiment 3

[0054] The difference between the third example and the first example lies in the structural shape and clamping mode of the beam specimen. Such as Figure 11 with Figure 12 As shown, the top and bottom surfaces of both ends of the beam specimen are provided with arc-shaped grooves 51 . The two ends of the beam test piece are respectively installed on two rotatable clamping seats 41 at the ends of the beam. The structure and shape of the rotatable clamping seat 41 at the beam end in this embodiment is the same as that of the rotatable clamping seat at the beam end in Embodiment 1, and will not be repeated here. In this way, the beam specimen can rotate slightly at both ends of the beam specimen and move slightly in the horizontal direction, which is similar to the constraints of a simply supported beam structure. Simply supported beam structure is more common in engineering, such as bridge crane girder as simply supported beam structure. Based on the similarity theory, the...

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Abstract

The invention relates to a beam structure vibration fatigue device. The device comprises a beam test piece, a beam end clamping seat, a vibration platform, a vibration motor, a vibration isolation spring and a base, one end of the beam test piece is installed on the beam end clamping seat or the two ends of the beam test piece are installed on the beam end clamping seat, the beam end clamping seatis installed on the vibration platform, and the vibration motor is installed on the vibration platform. An eccentric block is mounted at the output shaft of the vibration motor, a vibration isolationspring supports the vibration platform, one end of the vibration isolation spring is connected to the base, and the other end of the vibration isolation spring is connected with the vibration platform. Under the action of exciting force, the vibration platform and accessories installed on the vibration platform can generate forced vibration, and the beam test piece and the beam end clamping seatvibrate along with the vibration platform. Because the end part of the beam test piece is fixed, the vibration deformation part is not connected with the vibration platform, the vibration deformationof the beam test piece does not influence the vibration of the vibration platform, and the distortion degree of the generated vibration waveform is small. In addition, the fatigue test of a cantileverbeam, a simply supported beam and the fixed beams at the two ends can be realized through one device.

Description

technical field [0001] The invention relates to the field of fatigue testing machines, in particular to a beam structure vibration fatigue device. Background technique [0002] Beam structures are widely used in aerospace, energy power, machinery and construction, such as helicopter rotors, bridge crane girders, elastic foundation beams, vibrating screen load-bearing beams, etc. Most beam structures are often subjected to alternating stress during operation and use, and are prone to fatigue cracks. Under the action of dynamic load, these cracks will continue to expand and lead to fracture, which will affect the stable operation of production in the slightest, and induce disasters in severe cases. For example, at the beginning of 1981, the "Kierland" platform in the North Sea oilfield in Europe collapsed. The cause of the accident was that the beam bearing hole was cracked due to fatigue under the alternating stress of the waves. According to statistics, structural failure ...

Claims

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Application Information

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IPC IPC(8): G01M7/06
CPCG01M7/06
Inventor 龙慧黄长征吴伟辉陈名涛
Owner SHAOGUAN COLLEGE
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