Analytic and experimental study for light alloy aluminium panels under compression

• Autorzy: Fayza A. , Zghal A. , Bayraktar E.
• Języki publikacji: EN

Abstrakty

EN

Purpose: Aluminium alloys have been indispensable for the progress of many technologies during the last decades. In particular, most stiffeners in aerospace structures are composed of aluminium panels often solicited with elastic and plastic bucking under particular boundary and loading conditions. The purpose of this paper is to enhance the difficulties encountered to predict the incipient elastic-plastic buckling for thin aluminium plates under combined compressive loads. Design/methodology/approach: The used methodology was an analytic non linear approach, validated further with an experimental investigation. In fact, the instability of thin elastic-plastic rectangular panels made of 2024 T45 alloys is analyzed. General concept of the Von Kaman's equation with a set of trigonometric and harmonic functions was used in the analytic model. The computation of buckling loads concerns both elastic and plastic instability solutions. Developments in the plastic range were concerned with the (j2d) deformation and the (J2f) flow constitutive laws. Findings: A methodology to develop this kind of analytic resolution is pointed out and has been illustrated for a set of variables. Several 2d and 3d plots, which can be used to predict incipient buckling strengths for plates with flat initial configurations, have been presented for the various load conditions. Research limitations/implications: In the future it will be possible to apply the investigated analytic procedure to other particular cases. Practical implications: Plots obtained with analytic solution can be used to predict incipient buckling strengths for plates with flat initial configurations are presented for the various tests. The interest of three dimensional representations is to indicate when plastic buckling occurs for a square plate under biaxial loading. Originality/value: This paper presents a stable and low cost analytic solution to deal with instability phenomenon in elastic and plastic range for the design of light alloy aluminium plates. This approach is applied to assess the conditions for which plastic buckling can happen when particularly thin aluminium panels are used. This latter, can be implemented in finite element standard codes.

Słowa kluczowe

EN

metallic alloys; analytic solution; aluminium alloys; plasticity; instability; buckling

PL

stopy metaliczne; rozwiązania analityczne; stopy aluminium; plastyczność; niestabilność; wyboczenie

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 25, nr 1
• Strony: 19--22
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Fayza A.

autor

Zghal A.

autor

Bayraktar E.

• Laboratory of Mechanics, Structures and Technological Development, High School of Sciences and Techniques, Tunisia. 5 Avenue Taha Hussein 1008 Montfleury, Tunis, Tunisia,

Bibliografia

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• [3] K.K Shukla, Y Nath, Analytical solution for buckling and post buckling of angle ply laminated plates under thermo-mechanical loading, Applied mechanics department, iit Delphi, International Journal of Non Linear Mechanics (2000) 1097-1108.
• [4] M. Azhari, S. Hshdar, M.A. Bradford, On the use of bunble functions in the local buckling analysis of plate structures by the split finite strip method, International Journal for Numerical Method in Engineering 48 (2000) 583-593.
• [5] Shanley, Hill, Post buckling analysis of imperfect stiffened laminated cylindrical shells under combined external pressure and loading, International Journal of Mechanical Sciences 40 (1998) 339-355.
• [6] Zghal, M. Potier Ferry, A. Nadari, Buckling analysis based on polycrystalline plasticity, Revue de Mécanique Appliquée et Théorique 1 (2000) 41-61.
• [7] J. Henrik Sâllstrôm, Accurate calculation of elastic buckling loads for space frames built up of uniform beams with open thin walled cross section, International Journal for Numerical Method in Engineering 39 (1996) 2319-2333.
• [8] Z.Q. Xiong, L.S. Xie, Study on the theory and application of the energy method for analyzing compressive instability in sheet forming, Journal of Materials Processing Technology 129 (2002) 255-260.