Life Envelope Extension Method for Corrosion Fatigue Key Parts of Aircraft Structure

Abstract

The invention discloses a service life envelope extending method for prolonging the service life of plane structure corrosion fatigue key parts. The method includes: building a standard service life envelope before service life prolonging of the plane structure corrosion fatigue key parts; determining the residual standard service life envelope, satisfying 99.9% of reliability and 90% of confidence level, of a new sample; overlying the standard service life envelope and the residual standard service life envelope according to proportions to obtain an extended service life envelope. The method has the advantages that prolonging of the fatigue service life and the calendar service life of the plane structure corrosion fatigue key parts can be achieved while the reliability and confidence level of a plane structure are kept, the service life potential of the plane structure can be fully exploited, and significant economical and practical values are achieved; the relations of the fatigue service life and the calendar service life of the plane structure in a corrosion environment are considered, the problem that the fatigue service life and the calendar service life of the plane structure are not matched is solved, and safety of the plane structure can be guaranteed effectively.

Description

technical field [0001] The invention relates to a method for extending a life envelope, in particular to a method for extending a life envelope used for prolonging the life of key components of aircraft structure corrosion fatigue, and belongs to the technical field of aircraft structure life extension. Background technique [0002] The service life of an aircraft structure refers to the service period of the aircraft from being put into service to decommissioning and grounding under normal service conditions, including the benchmark fatigue life characterized by equivalent flight hours or the number of take-offs and landings and the benchmark calendar life represented by the service life. In the existing life management methods, when any of the three indicators of the equivalent flight hours, number of take-offs and landings, and service life of the aircraft reaches the specified value at the time of the aircraft's life, it means that the aircraft has reached the end of its ...

AI Technical Summary

Problems solved by technology

[0013] The existing methods for prolonging the life of the key components of aircraft structure corrosion fatigue are fatigue life prolongation and calendar life prolongation respectively. During the service process after prolonging the life, the fatigue life of the structure will be significantly reduced due to the influence of the corrosive environment, which may lead to corrosion fatigue The structural safety life of key parts is lower than the expected fatigue life, and there are potential safety hazards

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