Point contact type fretting fatigue test device and point contact type fretting fatigue test method

Abstract

The invention discloses a point contact type fretting fatigue test device and a point contact type fretting fatigue test method. The test device comprises a fretting bridge in direct contact with a sample, a loading ring with a ring surface perpendicular to the axial direction of the sample, and a loading bolt which passes through the wall of the loading ring to be in contact with the fretting bridge; the sample passes through the center of the ring surface of the loading ring; the contact surface of the fretting bridge and the sample is provided with a fretting bridge leg in the shape of a convex arc surface; the fretting bridge leg or the loading bolt is provided with a strain foil and is connected with a strain gauge; the point contact between the fretting bridge and the sample is achieved by the direct contact between the fretting bridge leg of the fretting bridge and the sample; the contact surface of the sample can generate slight relative movement and normal pressure is applied to the contact surface of the sample, by means of adjusting the loading bolt to apply pressure to the fretting bridge. Matched with a fatigue testing machine, the test device can be used for performing theoretical research on stretching tension, torsion and tension-torsion composite fretting fatigue modes.

Description

technical field [0001] The invention relates to a fretting fatigue test device, in particular to a point-contact fretting fatigue test device and a test method. Background technique [0002] In engineering practice, the damage of components often comes from the effect of tension-torsion composite fretting fatigue. Therefore, a multi-parameter adjustable point contact fretting fatigue device is designed to study tension-compression, torsion and tension-torsion composite fretting fatigue components. For damage behavior, it is necessary to find the dangerous area on the model and avoid the damage caused by the damage. At present, the research on fretting fatigue is basically carried out in the form of experiments, and some laws are obtained through experiments qualitatively, so as to be applied to engineering practice. For fretting fatigue experimental research, most of them focus on tension-compression fretting fatigue and torsional fretting fatigue, and mostly use physical r...

AI Technical Summary

Problems solved by technology

Fretting fatigue is a combined process of fretting wear and fatigue, involving three failure modes of friction and wear, fatigue and corrosion. The main factors affecting fretting fatigue are contact stress, frequency, displacement amplitude and stress amplitude, etc.; Fretting fatigue must be combined with tribology theory and fatigue theory. For fretting fatigue experimental research, most of them focus on tension and compression fretting fatigue and torsional fretting fatigue, and mostly use physical research or surface contact for research, which can be better used Fatigue theory, while the application of tribological theory is relatively difficult, and it is impossible to study the sticking zone, slipping zone and opening zone in fretting wear

At the same time, the tension-torsion compound fretting fatigue mode is relatively rare, and the theoretical research cannot be carried out better by physical research or surface contact.

However, the existing technology cannot solve the problem of equipment well, and the in-depth research on fretting fatigue theory will be restricted

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