Monitoring sensor for accumulated fatigue damage of mechanical structure under normal load distribution rule, design method and monitoring method

Abstract

The invention provides a monitoring sensor for accumulated fatigue damage of mechanical structure under normal load distribution rule, a design method and a monitoring method, which belong to the technical field of structure fatigue monitoring. An installation pin of the fatigue damage monitoring sensor is used for bearing stress on the surface of the mechanical structure; two strain amplificationbridges are used for amplifying the average strain of the surface of the measured structure at the position covered by a stretching arm at different multiplying powers, so as to guarantee that the fatigue life foil works within the effective strain amplitude range; through a structure cumulative fatigue damage monitoring model, when the structure serves under the load effect complying with the normal distribution rule, the cumulative fatigue damage of the mechanical structure can be obtained according to the resistance cumulant of the double-fatigue-life foil. Safe service of mechanical partsis ensured, and accidents are prevented.

Description

technical field [0001] The invention relates to a mechanical structure cumulative fatigue damage monitoring sensor, a design method and a monitoring method under the normal load distribution law, in particular to a design method of a fatigue damage monitoring sensor, which belongs to the technical field of structural fatigue monitoring. Background technique [0002] Fatigue damage refers to the phenomenon that when the structure is subjected to cyclic loading, some parts of the structure will have local permanent damage, and cracks will be formed or even completely broken after a certain number of cycles. The problem of cumulative fatigue damage monitoring of mechanical structures has always been an important topic in the field of machinery. The failure of complex mechanical systems, such as accidents in aircraft engines, automobiles, nuclear power plants, and large tunnel boring machines, will cause major casualties, economic losses, and environmental damage. According to s...

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Problems solved by technology

[0006] The present invention is aimed at the situation that the current fatigue life foil cannot work normally on the structure bearing low strain, and cannot realize cumulative fatigue analysis on the structure bearing normal distributed load, and invented a fatigue damage monitoring with double rate strain amplification sensors, and proposed a model for monitoring cumulative fatigue damage of mechanical structures under normal distributed loads

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