ANALYTIC SENSITIVITIES IN COMPOSITE WING-SHAPE SYNTHESIS PART ONE.: PANEL BUCKLING CONSTRAINTS
ELNOMROSSY, M., MEHANNA, M. (1999). ANALYTIC SENSITIVITIES IN COMPOSITE WING-SHAPE SYNTHESIS PART ONE.: PANEL BUCKLING CONSTRAINTS. EKB Journal Management System, 8(ASAT Conference, 4-6 May 1999), 1-19. doi: 10.21608/asat.1999.24891
M. M. ELNOMROSSY; M. A. MEHANNA. "ANALYTIC SENSITIVITIES IN COMPOSITE WING-SHAPE SYNTHESIS PART ONE.: PANEL BUCKLING CONSTRAINTS". EKB Journal Management System, 8, ASAT Conference, 4-6 May 1999, 1999, 1-19. doi: 10.21608/asat.1999.24891
ELNOMROSSY, M., MEHANNA, M. (1999). 'ANALYTIC SENSITIVITIES IN COMPOSITE WING-SHAPE SYNTHESIS PART ONE.: PANEL BUCKLING CONSTRAINTS', EKB Journal Management System, 8(ASAT Conference, 4-6 May 1999), pp. 1-19. doi: 10.21608/asat.1999.24891
ELNOMROSSY, M., MEHANNA, M. ANALYTIC SENSITIVITIES IN COMPOSITE WING-SHAPE SYNTHESIS PART ONE.: PANEL BUCKLING CONSTRAINTS. EKB Journal Management System, 1999; 8(ASAT Conference, 4-6 May 1999): 1-19. doi: 10.21608/asat.1999.24891

ANALYTIC SENSITIVITIES IN COMPOSITE WING-SHAPE SYNTHESIS PART ONE.: PANEL BUCKLING CONSTRAINTS

International Conference on Aerospace Sciences and Aviation Technology
Article 18, Volume 8, ASAT Conference, 4-6 May 1999, May 1999, Page 1-19  XML PDF (3.24 MB)
Document Type: Original Article
DOI: 10.21608/asat.1999.24891
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Authors
M. M. ELNOMROSSY1; M. A. MEHANNA2
1Staff Member, Aerospace Department, Military Technical College, Cairo.
2Engineer, Egyptian Armed Forces.
Abstract
Equivalent plate modeling techniques based on Ritz analysis with simple polynomials proved to be efficient tools for structural modeling of wings in the preliminary design stage. This paper describes a formulation of wing equivalent plate modeling in which it is simple to obtain analytic, explicit expressions for terms of the stiffness and geometric stiffness matrices without the need to perform numerical integration. The explicit expressions for the terms of the stiffness and geometric stiffness matrices are used for the buckling analysis of trapezoidal fiber composite wing skin panels. The formulation based on Ritz analysis using simple polynomials leads to explicit (axpressions for the analytic sensitivities of the stiffness and geometric stiffness matrices with respect to layer thickness, fiber orientations, and panel shape. Integration of the resulting buckling analysis based on the equivalent plate approach is discussed. To assess the new capability, test cases were chosen to address the convergence rate with increased polynomial order, the accuracy of analysis results for panels of general shape and the integration of wing box structural analysis with panel buckling analysis for fast structural analysis of airplane wings.
Keywords
composite wing; equivalent plate; buckling; Sensitivity analysis; stiffness matrix; geometric stiffness matrix; Finite element method
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