Normal loading device for fretting fatigue test

Abstract

The invention discloses a normal loading device for a fretting fatigue test. The normal loading device comprises a transmission device, a power source device, a supporting device and a clamping device; the two sides of the power source device are connected with the transmission device and the clamping device respectively; the clamping device is provided with a test piece and is connected with a computer through a data line; an incomplete gear of the transmission device is hinged to a connecting rod; the incomplete gear is connected with a box body through a return spring; one side of a rack ismeshed with a pinion; the power source device comprises a hydraulic cylinder, a hydraulic cylinder support, a bearing, a first roller and a hydraulic cylinder base; an output shaft of the hydraulic cylinder is provided with the bearing and the first roller; the two sides of the first roller are in contact with a second roller at one end of the connecting rod; the supporting device comprises a base, a supporting table, an anti-skid damping pad and a supporting table rear cover; a fretting pad bracket of the clamping device is fastened on the base; and a pressure sensor is arranged in the fretting pad bracket, has the two ends in contact with the rack and a fretting pad connecting rod respectively, and is connected with the computer through a data line.

Description

[0001] The invention relates to the technical field of fatigue test equipment, and relates to a fretting fatigue test normal loading device. Background technique [0002] Fretting is a complex loss process, which is subject to the interaction of wear, corrosion and fatigue. Its two contact surfaces have slight slippage when subjected to normal force, and the amplitude is usually on the order of micrometers. Fretting generally occurs in relatively "fastened" components. [0003] Fretting fatigue refers to the slight relative slippage of two closely contacted components under the action of an applied load, resulting in fatigue cracks on the surface of the component, which leads to premature failure of the component. It is called "Cancer" in industry. Fretting fatigue in mechanical engineering, aerospace, biomedical and other fields will accelerate the damage of components and reduce the service life. Therefore, the study of fretting fatigue is very important. When doing fretting fa...

AI Technical Summary

Problems solved by technology

If the contact width between the fretting pad and the sample is not well controlled, serious stress concentration will occur at the contact edge, which will have a great impact on the test

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