Stability analysis method and device for airplane structure rectangular flat plate

Abstract

The embodiment of the invention provides a stability analysis method and device for an airplane structure rectangular flat plate. The method comprises the steps that electronization is carried out on a curve chart of dual-pressure shearing and buckling related curves of the rectangular flat plate, and curve data is obtained, wherein the x-coordinates, the y-coordinates and values on the curves of the curve chart are marked as CurveRx, CurveRy and CurveRs in the curve data respectively; Rx, Ry and Rs are calculated according to the compression allowable stress sigma ccrx of the rectangular flat plate in the X direction, the compression allowable stress sigma ccry of the rectangular flat plate in the Y direction, the shearing allowable stress tau cr, the compression working stress sigma cx in the X direction, the compression working stress sigma cy in the Y direction and the shearing working stress tau; the CurveRx value, the CurveRy value and the CurveRs value meeting formula (I) are sought in the curve data based on a binary search algorithm; the safety margin MS=K-1 of the rectangular flat plate is calculated; the stability of the rectangular flat plate is analyzed according to the safety margin MS. By means of the method and device, the worked out safety margin is high in scientificity and reliability, and therefore the stability analysis result of the airplane structure rectangular flat plate is more reasonable and reliable.

Description

technical field [0001] The invention relates to the technical field of aircraft structures, in particular to a stability analysis method and device for a rectangular flat plate of an aircraft structure. Background technique [0002] The design and fine analysis of aircraft structure load-bearing stability have important engineering significance for the load-bearing safety, life and weight optimization of the structure. Among them, "Slab Double Compression Shear Instability Analysis" combines the finite element calculation results with test curves and empirical formulas to calculate the stability of the plate. [0003] In the "Structural Stability Design Manual" compiled by Mr. Cui Degang, when the stability analysis of the rectangular flat plate structure of the aircraft is carried out with the help of the curve of the double-pressure shear instability analysis of the flat plate, it is mainly by calculating the abscissa Rx of the curve, and the curve The value Rs on the ord...

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Problems solved by technology

[0006] The technical problem to be solved by the embodiments of the present invention is to provide a method and device for analyzing the stability of a rectangular flat plate of an aircraft structure, so as to solve the problem that the rectangular flat plate of an aircraft structure is not considered in the prior art when analyzing the stability of a rectangular flat plate of an aircraft structure. The problem of poor reliability of analysis results caused by actual force conditions

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