Fretting fatigue test device for high temperature rotating bending fatigue testing machine

Abstract

The invention relates to a fretting fatigue test device for a high temperature rotating bending fatigue testing machine. The fretting fatigue test device comprises a clamp for clamping a fatigue specimen, a support stress loading ring arranged at the outer side of the fatigue specimen, a strain sensing unit arranged on the outer side surface of the supporting stress loading ring, and a 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. A fretting test block is arranged on the inner endof the loading bolt. The fretting test block is in contact with the outer surface of the fatigue specimen and loads a fretting load. The outer end of the loading bolt is fixed to the stress loading ring through a fixing nut. Compared with the prior art, the fretting fatigue test device can be integrally placed in a high-temperature environment; the surface of the fatigue specimen subjected to a bending load is stretched and compressed during rotation, so that the fatigue specimen and the ceramic test block form a slight slip amplitude by strain caused by the tensile and the compression, thereby realizing the rotating bending fretting fatigue test under a high-temperature condition.

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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