Rotary bending fretting fatigue test device for interference fit structure

Abstract

The invention discloses an interference fit structure rotation bending fretting fatigue test device, which comprises a sample wheel and a sample shaft, a mounting hole of the sample wheel is in interference fit connection with the sample shaft, the sample wheel is fixedly connected with a rotation driving device, the sample shaft is rotatably arranged in a clamping device, and the clamping device is provided with a linear driving device. The driving direction of the linear driving device is perpendicular to the axis direction of the sample shaft, a circulating water cooling device is arranged at the clamping device, and the rotary driving device and the linear driving device are both arranged on the workbench. According to the invention, the rotary driving device applies a rotary load to the sample wheel and the sample shaft which are in interference fit, the linear driving device applies a bending load to the sample shaft and the sample wheel which are in interference fit, and the circulating water cooling device performs circulating water cooling; and the sample shaft and the sample wheel which are in interference fit rotate under a normal-temperature environment condition and bear a constant force for generating a bending moment, so that the sample shaft and the sample wheel which are in interference fit are subjected to a fatigue performance test of bearing a bending moment under a rotating condition.

Description

technical field [0001] The invention relates to the technical field of fatigue test devices, in particular to a rotating bending fretting fatigue test device with an interference fit structure. Background technique [0002] Metal fatigue refers to the process in which materials and components gradually produce local permanent cumulative damage in one or several places under the action of cyclic stress or cyclic strain, and cracks or sudden complete fractures occur after a certain number of cycles; when materials and structures After being subjected to repeated load changes, although the stress value has never exceeded the strength limit of the material, or even lower than the elastic limit, damage may occur. This kind of damage phenomenon of materials and structures under repeated alternating loads , which is called metal fatigue failure. [0003] Fretting refers to the very small relative sliding between the surfaces of two objects in contact with each other, and its displ...

AI Technical Summary

Problems solved by technology

The fretting behavior will lead to fretting wear and fretting fatigue between the contact surfaces, especially when the contact surfaces of two objects assembled together by interference fit are subjected to rotational bending load, the surface is very prone to fatigue cracks due to the fretting phenomenon, resulting in structural failure due to fretting fatigue

[0004] As a typical interference fit structure, the wheel set is subjected to both rotation and bending loads during service, so the edge of the wheel set interference fit will cause serious fretting damage; at present, laboratories often use materials such as The fretting fatigue testing machine is used for the fretting fatigue test. For the time being, there is no testing machine that can perform the fretting fatigue test of the rotating bending load of the interference fit structure.

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