A fretting fatigue test device for high temperature rotary bending fatigue testing machine

Abstract

The invention relates to a fretting fatigue test device for a high-temperature rotary bending fatigue testing machine, which includes a clamp for clamping a fatigue sample, a supporting stress loading ring arranged outside the fatigue sample, and a supporting stress loading ring arranged outside the supporting stress loading ring. The strain sensing unit on the surface and the data acquisition unit connected with the strain sensing unit, two loading bolts are oppositely arranged on the side wall of the supporting stress loading ring, and the inner end of the loading bolt is provided with a fretting test block, and the fretting test block is connected with the fatigue test block. The outer surface of the sample is in contact with and loaded with a fretting load, and the outer end of the loading bolt is fixed with the stress loading ring by a fixing nut. Compared with the existing technology, the present invention can be placed in a high-temperature environment as a whole, and the fatigue sample bearing the bending load realizes surface tension and compression during rotation, and the resulting strain forms a small slip amplitude with the ceramic test block. value, to realize the rotating bending fretting fatigue test under high temperature conditions.

Description

technical field [0001] The invention relates to the technical field of material testing, in particular to a fretting fatigue testing device for a high-temperature rotary bending fatigue testing machine. Background technique [0002] Fretting generally occurs between two contact surfaces that are nominally stationary. When one of the components is subjected to fatigue cyclic loading, its strain change will bring about extremely small vibrations within the displacement amplitude of hundreds of microns between the two contact surfaces, thereby generating fretting. Fatigue phenomenon. Fretting fatigue is often affected by material properties such as roughness, hardness, and plastic behavior, as well as external conditions such as external load, displacement amplitude, vibration frequency, and ambient humidity and temperature. It is a subject that integrates materials, mechanics, and surface physics. interdisciplinary. Fretting fatigue can occur in many engineering fields such ...

AI Technical Summary

Problems solved by technology

When the contact local wear is intensified, it is easy to cause the axis line of the turbine shaft to deflect, and the wheel disc will swing back and forth under the impact of high-speed rotation and changing air flow, which will promote the rotation and bending of the turbine shaft and the initiation and expansion of fretting fatigue cracks. cause the system to fail, will cause the aircraft to lose power source, and then cause a catastrophic accident

However, at present, there is no test equipment and test method specially designed for high temperature rotating bending fretting fatigue test.

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