Thermally sprayed coating contact fatigue test machine capable of realizing failure early warning

Abstract

A thermally sprayed coating contact fatigue test machine capable of realizing failure early warning comprises a test device, a lubricating module, a loading module, a driving module and a signal acquisition module; in the test device, a lubricating fluid chamber sleeves a main shaft, the lower end of a test chamber is in interference fit with the end portion of the main shaft and is fixed to the main shaft, a lower sample is assembled in the test chamber, and the lower sample is in interference fit with the test chamber; an upper sample is in interference fit with an upper sample fixing plate, a roller is arranged between the upper sample and the lower sample, the upper sample fixing plate is directly acted by force load by the loading module, and the upper sample is indirectly acted by the upper sample fixing plate; and the signal acquisition module comprises an acoustic emission sensor, a data adapting card and a computer, the acoustic emission sensor is arranged in the upper sample fixing plate, and the acoustic emission sensor is in direct contact with the upper surface of the upper sample. The thermally sprayed coating contact fatigue test machine capable of realizing failure early warning, provided by the invention, can effectively detect the rolling fatigue degree.

Description

technical field [0001] The invention relates to a fatigue testing machine, in particular to a thermal spray coating contact fatigue testing machine capable of realizing failure warning. Background technique [0002] Rolling contact fatigue (RCF) is the main failure mode of more common mechanical parts and engineering structures, such as shafts, gears, cams and rollers. Rolling contact fatigue can cause huge economic losses and limit working equipment properties. The main manifestation of wear is the removal of surface material by causing adhesion forces under sliding contact. Rolling contact fatigue often occurs on the surfaces of friction pairs in rolling contact. It is a permanent damage mode, which includes crack initiation, crack propagation and fracture of the surface layer caused by the shear stress generated by the crack under the action of alternating load. Rolling contact fatigue is both disciplines concerned with surface failure of materials that share common fe...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the inadequacy of the existing rolling contact method that cannot detect the degree of rolling fatigue, the present invention provides a thermal spray coating contact fatigue testing machine that can effectively detect the degree of rolling fatigue and can realize failure warning

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