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A method for predicting post-buckling of a reinforced wallboard based on finite element analysis

A technology of reinforced wall panels and post-buckling, applied in calculation, design optimization/simulation, and special data processing applications, etc., can solve problems such as low structural efficiency, long time, and low precision, and achieve the effect of saving physical test costs

Pending Publication Date: 2019-04-26
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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Problems solved by technology

[0003] The purpose of the present invention is: to design a method based on finite element analysis to predict the post-buckling of stiffened panels, to solve the problems of high cost, long time, high risk and low precision in engineering calculation methods that exist in current physical tests, resulting in relative structural efficiency. Poor technical issues

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  • A method for predicting post-buckling of a reinforced wallboard based on finite element analysis
  • A method for predicting post-buckling of a reinforced wallboard based on finite element analysis
  • A method for predicting post-buckling of a reinforced wallboard based on finite element analysis

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Embodiment Construction

[0035] Below in conjunction with accompanying drawing, method of the present invention is described in detail:

[0036] The schematic flow chart of the method of the present invention is as figure 1 As shown, the specific embodiment is taken as an example below to describe in detail as follows: In the example, the front view of the test piece is as follows image 3 As shown, among them, 1 is the assessment area, 2 is the transition area, the specific specifications are as follows:

[0037] The length of the examination area of ​​the reinforced wall plate shear test piece is 700 mm, and the examination area of ​​the test piece is composed of four identical long stringer units, the section of the long stringer unit is as follows: Figure 4 shown. The transition area around the assessment area is used to connect with the test fixture. The thickness of the transition area is 10.5mm and the width is 150mm.

[0038] The specific profile parameters are shown in Table 1.

[0039] ...

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Abstract

The invention relates to a method for predicting the post-buckling of a reinforced wallboard based on finite element analysis, which comprises the following steps: firstly, carrying out simulation modeling on a reinforced wallboard shear test piece, and carrying out linear buckling analysis to obtain a reinforced wallboard shear characteristic value buckling mode; Before nonlinear buckling analysis is carried out, a first-order buckling mode vector of the stiffened wallboard is normalized and multiplied by a defect base vector to obtain a defect offset vector, forced node displacement is applied through an SPCD model data card, and defects of an assessment area are introduced into a perfect stiffened wallboard structure in a form of updating unit node coordinates; The large deflection andthe plastic effect of the post-buckling of the reinforced wallboard are considered, post-buckling calculation is carried out on the structure, the bearing capacity of the reinforced wallboard is predicted through a load-displacement curve of a load application point in the process from stress deformation to post-buckling damage of the structure, and the accuracy and engineering feasibility of themethod are verified through a test result; By means of the method, physical tests are reduced, and great significance is achieved for reducing the test cost and risk.

Description

technical field [0001] The invention belongs to the field of aeronautical structure design, and in particular relates to a method for predicting the post-buckling of a reinforced wall plate based on finite element analysis. Background technique [0002] The stiffened panel is an important load-bearing structure of the aircraft. Under the landing configuration of the carrier-based aircraft and the take-off and landing configuration of the civil aircraft, the shear stress borne by the skin will be greater than the critical shear stress. At this time, the skin begins to lose stability. Due to the presence of stiffeners on the wall plate, the skin can continue to bear the increased external load after the instability, but its internal force is redistributed, and the number of unstable corrugations increases and tends to be regular, and eventually post-shear buckling failure may occur. When the aircraft is flying with heavy overload, the axial compression load of the stiffened pa...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/15Y02T90/00
Inventor 刘存李苗
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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