A Method for Determining the Loading Frequency of Aircraft Structure Fatigue Test

Abstract

A method for determining the loading frequency of an aircraft structure fatigue test is characterized in that it comprises the following steps: Step 1, performing static strain measurement under each peak and trough load; Step 2, calculating the static measurement strain average value; Step 3 , Carry out the fatigue spectrum strain measurement; Step 4, calculate the relative error η between the fatigue spectrum strain measurement value and the static measurement strain average value k , judging η k Whether the theoretical basis used in the present invention is correct, the implementation steps are clear and simple, and the engineering concept is clear. The invention solves the problem that the fatigue loading frequency is not easy to determine in the aircraft structure fatigue test.

Description

technical field

[0001] The invention belongs to the field of aviation fatigue damage tolerance test, in particular to a method for determining the loading frequency of aircraft structure fatigue test. Background technique

[0002] Aircraft structural fatigue tests generally have a long test period, and the test period is related to the severity of the load spectrum, low load cutoff, and test loading frequency.

[0003] The determination of the severity of the load spectrum and the low-load cut-off shall be determined by the test proposer after extensive theoretical analysis and research in the test planning stage and before the test, and finally specified in the test task book by the test proposer. The loading frequency of the structural fatigue test is determined according to the debugging results during the test debugging process, combined with the test deformation coordination and other conditions.

[0004] Regarding the research on the loading frequency of the aircraft ...

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