A thread loosening analysis method based on fretting friction theory

Abstract

The invention belongs to the technical field of thread loosening. A thread loosening analysis method based on fretting friction theory is provided, which includes the analysis of stress and looseningof thread model, the analysis of fretting slip state, the establishment of fretting slip model, the establishment of simulation model, the analysis of fretting slip state based on grain dissipation energy, and the analysis of fretting slip state using fretting diagram. On the basis of fully considering the influence of fretting friction on thread loosening, a thread loosening analysis method basedon fretting friction theory is presented, A mathematical model of that contact surface is established, theoretical formulas of stress distribution and pressure distribution at the screw loosening interface are established, and the interface stress and pressure are simulated to analyze the loosening phenomenon, and the loosening state is clearer by introducing the theory of screw dissipation energy and fretting diagram, which provides a reference for the future research on this kind of screw loosening. For the above reasons, the present invention can be widely popularized in the field of thread loosening.

Description

technical field [0001] The invention relates to a thread loosening analysis method based on fretting friction theory, and belongs to the technical field of thread loosening. Background technique [0002] As a common fastening method, bolted connection structure is widely used in various mechanical structures, especially in the fields of aviation and aerospace. The quality of bolted connection structure is very important to the overall performance of mechanical equipment. Loosening is one of the main forms of failure of the bolted connection structure, which will lead to a gradual decrease in the clamping force between the connecting parts, and even cause the failure of the entire bolted connection, causing major accidents. is of great significance. [0003] Although the loosening of the screw connection did not cause major accidents at the initial stage of failure, the bolt tension will become lower and lower during the failure process, and the resulting structural failures...

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Problems solved by technology

[0005] Based on the above-mentioned situation, various research scholars have only studied the local factors of thread loosening and have not proposed a complete theory of thread loosening. Therefore, the present invention proposes a thread loosening analysis method based on fretting friction theory, mainly It is from the force analysis of the thread, the loose thread

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