A sensor, design method and monitoring method for cumulative fatigue damage monitoring of mechanical structures under normal load distribution

Abstract

The invention provides a mechanical structure accumulative fatigue damage monitoring sensor, a design method and a monitoring method under the normal load distribution law, and belongs to the technical field of structural fatigue monitoring. The mounting feet of the fatigue damage monitoring sensor are used to withstand the stress on the surface of the mechanical structure, and the average strain of the surface of the measured structure covered by the stretching arm is amplified by different magnifications through two strain amplification bridges to ensure the effective strain amplitude of the fatigue life foil Work within the scope; through the structural cumulative fatigue damage monitoring model, when the structure is in service under the load that obeys the normal distribution law, the cumulative fatigue damage of the mechanical structure can be obtained according to the cumulative resistance of the double fatigue life foil to ensure the safety of mechanical parts Serve to prevent accidents from happening.

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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