Calculation method of bearing capacity of reinforced wall plate

Abstract

The invention provides a calculation method of the bearing capacity of a reinforced wall plate and belongs to the field of strength analysis of aircraft structures. According to the technical scheme, the calculation method is an axial compression loading action based calculation method of the effective width of buckling of a skin. Stiffness reduction is performed through modification of the cross section area and the moment of inertia of a stringer in a finite element model which is formed by plate beam units after the buckling of the skin is produced, stress analysis of a structure is performed by a linear iteration solution method of load loading steps, comparison is performed on the working stress of the stringer in a calculation result and the allowable limiting stress of a stringer and skin combined structure, the allowable limiting stress serves as a damage standard and is solved based on an engineering method, and accordingly the bearing capacity of the structure is obtained. Compared with the traditional full housing model, a calculation method model is a plate beam unit model, the geometric nonlinearity and contact problem solution which is large in time consumption and difficult to converge is replaced by the linear solution, and accordingly the modeling time consumption is small, the calculation speed is high, and the requirements for the professional quality of the computer hardware and analysis staff are low.

Description

technical field [0001] The invention relates to a method for calculating the bearing capacity of a reinforced wall plate, which belongs to the field of strength analysis of aeronautical structures. Background technique [0002] The literature [A numerical assessment of the buckling / ultimate strength characteristics of stiffened aluminum plates with fixed / floating transverse frames[J].Thin-Walled Structures,2009,47:1373–1386.] is a typical representative of the current calculation of stiffened wall panels Post-buckling method. The method is calculated by establishing a finite element model method. The specific method is: [0003] 1) Combining the structural composition and geometric characteristics of the reinforced panel to construct the model. The skin and ribs are simulated by the shell element (Shellelement), and the connectors are simulated by the spring element (Spring element); [0004] 2) The material mechanical properties and load boundary conditions of each part...

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Problems solved by technology

[0008] 1) Due to the need for post-buckling analysis, the reinforced panel needs to be established as a detailed finite element model that can reflect the changes in stiffness of the details, and the modeling workload is heavy and error-prone;

[0009] 2) The selection of the performance parameters of the connectors in the construction of the reinforced panel model is very different from the performance in the actual assembly process, which affects the credibility of the calculation results;

[0010] 3) The finite element model established according to this method needs to consider nonlinear problems such as geometric nonlinearity and contact at the same time, which makes it difficult to converge the calculation results and the calculation is not easy to succeed

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