A Reliability Study on the Structural Performance Prediction of Reinforced Aluminium Panels with Respect to Variations in Input Parameters of Numerical Simulations

Abstract:

Stiffened panels are composed of a base plate with stiffeners in one or more directions, leading to lightweight structures with high resistance. The structural design, in most cases, focuses mainly on the longitudinal compressive loads that the panels are subjected and can safely withstand. In the present work, a set of Finite Element Method Analyses (FEA) were carried out, using ABAQUS commercial simulation software, and compared with experimental data in order to infer about the sensitivity of the results to the initial geometrical imperfections (either in magnitude and shape). The developments in the present work aim to provide a range of models able to properly reproduce the experimental behaviour of aluminium stiffened panels subjected to compressive loads. It was shown that FEA using shell finite elements were able to obtain accurate predictions of the ultimate load, considering large deformation and elasto-plastic behaviours. The effect of using different shapes and magnitudes of the initial geometrical imperfections on the numerical simulation of the panels was also inferred and tested using previously obtained eigenvalue (EV) buckling modes.

• Periodical: Key Engineering Materials (Volumes 504-506)
• Pages: 1397-1402
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.504-506.1397
• Online since: February 2012
• Authors: Rui Miguel Ferreira Paulo, Filipe Teixeira-Dias, Robertt Valente
• Keywords: Elasto-Plastic Buckling, Finite Element Modeling (FEM), Initial Geometrical Imperfections, Integrally Stiffened Panels

References

[1] Khedmati, M. R., Bayatfar, A. and Rigo, P. Post-buckling behaviour and strenght of multi-stiffened aluminium panels under combined axial compression and lateral pressure. Thin-Walled Structures 2010 23 39-66.

DOI: 10.1016/j.marstruc.2009.10.003

[2] Paik, J. K., Veen, S., Duran, A. and Collette, M. Ultimate compressive strength design methods of aluminum welded stiffened panel structures for aerospace, marine and land-based applications: A benchmark study. Thin-Walled Structures 2005 43 1550-1566.

DOI: 10.1016/j.tws.2005.06.003

[3] Collette, M. Strenght and Reliability of Aluminium Stiffened panels. PhD Thesis, University of Newcastle, 2005.

[4] Murphy, A., Price, M., Gibson, A. and Armstrong, C. G. Efficient non-linear modelling of fuselage panels. Proceeding of the ICAS2002 Conference 2002.

[5] Aalberg, A., Langseth, M. and Larsen, P. K. Stiffened aluminium panels subjected to axial compression. Thin-Walled structures 2001 39 861-885.

DOI: 10.1016/s0263-8231(01)00021-0

[6] ABAQUS. Abaqus Documentation (v.6.9). Simulia Dassault Systémes 2010.

[7] Murphy, A., Price, M., Lynch, C. and Gibson, A. The computational post-buckling analysis of fuselage stiffened panels loaded in shear. Thin-Walled Structures 2005 43 1455-1474.

DOI: 10.1016/j.tws.2005.03.010

[8] Paulo, R. M. F. Numerical simulation of the behaviour of reinforced structures. MSc Thesis (in Portuguese), University of Aveiro, 2011.

[9] Zha, Y. and Moan, T. Ultimate Strength of Stiffened Aluminum Panels with Predominantly Torsional Failure Modes. Thin-Walled Structures 2001 39(8): 631-648.

DOI: 10.1016/s0263-8231(01)00027-1