A strength analysis method for variable gradient composite panels

Through the variable gradient composite panel strength analysis method, the stress unevenness and instability problems of composite panel of large aircraft wing control surface were solved, and lightweight design and improvement of stability and strength were achieved.

CN116305532BActive Publication Date: 2025-09-16XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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Patent Information

Application Number
CN202310083309.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-02-08
Publication Date
2025-09-16
Estimated Expiration
2043-02-08

AI Technical Summary

Technical Problem

The stress inhomogeneity and instability modes of composite panels with variable gradient trapezoidal cross-sections of large aircraft wing control surfaces are complex, so it is necessary to study the instability characteristics of panels with trapezoidal structures with large stress gradient changes.

Method used

The strength analysis method of variable gradient composite material wall panels is adopted. By determining the stress form of the box structure, calculating the shear stress, compression stress and bending stress, and combining the shear, axial compression and bending stability safety margins, the optimized iterative solution is achieved to achieve lightweight design.

Benefits of technology

The stability and strength design of variable gradient trapezoidal composite material wall panels was achieved, effectively reducing weight by 16.8% and with a test error of only 2%, meeting the aircraft stability and strength requirements.

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Abstract

The present application belongs to the technical field of structural strength analysis, and particularly relates to a strength analysis method for a variable gradient composite material wall panel, the strength analysis method comprising: solving the shear stress and compression stress of the variable gradient composite material wall panel based on the external load and structural parameters of the variable gradient composite material wall panel; calculating the allowable shear stress, allowable axial compression stress, and allowable bending stress based on the structural parameters; calculating the safety margin through the shear stress, the compression stress, the allowable shear stress, the allowable axial compression stress, and the allowable bending stress; the iterative safety margin is 0; and the stability strength design of the trapezoidal composite material wall panel with a variable gradient of the rudder surface can be performed, and finally the lightest wall panel structural parameters that meet the constraint conditions are obtained.
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