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Peeters, D.M.J. (author), Pagani, Alfonso (author), Augello, Riccardo (author), Carrera, Erasmo (author), do Prado, Alex Pereira (author), Cabral, Pedro Higino (author), dos Santos, Henrique E.A.A. (author)
Representative stiffened panels are optimized such that multiple buckling modes and failure (using open hole allowables) occur within a range of 10% of the lowest buckling load. This implies the panels cannot be loaded up to the buckling load without risking failure, hence vibrational correlation testing was used to estimate the buckling loads...
conference paper 2022
document
Dos Santos, Rogério R. (author), Castro, Saullo G.P. (author)
The present study investigates how to apply continuous tow shearing (CTS) in a manufacturable design parameterization to obtain reduced imperfection sensitivity in lightweight, cylindrical shell designs. The asymptotic nonlinear method developed by Koiter is applied to predict the postbuckled stiffness, whose index is constrained to be...
journal article 2022
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Pitton, Stefano (author), Ricci, S (author), Bisagni, C. (author)
The main driver of aerospace structures design is the increase in performances of currently in use components. The behavior of structures is investigated by means of highly accurate finite elements (FE) analysis. The problem related to this kind of simulations is the high computational time required to obtain the structural response associated...
conference paper 2019
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Jeliazkov, M. (author), Sardar Abadi, P.M. (author), Lopes, C.S. (author), Abdalla, M.M. (author), Peeters, D.M.J. (author)
A computationally efficient two-level design methodology is developed for the optimization of stiffened compression loaded panels having variable stiffness panels as their skin. In the first step extensive bay panel optimization is performed using a Rayleigh-Ritz energy method coupled with a specialized Genetic Algorithm. Results in agreement...
conference paper 2015
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Wang, D. (author), Abdalla, M.M. (author)
There is a renewed interest in grid-stiffened composite structures; they are not only competitive with conventional stiffened constructions and sandwich shells in terms of weight but also enjoy superior damage tolerance properties. In this paper, both global and local structural instabilities are investigated for grid-stiffened composite panels...
conference paper 2014
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Khani, A. (author)
Automated fibre placement (AFP) machines are able to place simultaneously several bundles of fibres, called tows, on a surface. Using AFP machines, it is also possible to manufacture composite laminates with fibres placed in curvilinear paths. The fibre orientations and stiffness properties of these laminates are spatially varied and hence they...
doctoral thesis 2013
document
Liang, K. (author)
Thin-walled structures, when properly designed, possess a high strength-to-weight and stiffness-to-weight ratio, and therefore are used as the primary components in some weight critical structural applications, such as aerospace and marine engineering. These structures are prone to be limited in their load carrying capability by buckling, while...
doctoral thesis 2013
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Vries, J. De (author)
Imperfections are irregularities of the shape of a thin-walled shell, such as those used for rocket structures or silos. Knowing the imperfections is very important as thin-walled shells are very sensitive to imperfections. Even a small deviation with respect to the perfect shell shape reduces the buckling load significantly. The main objective...
doctoral thesis 2009
document
Roodenburg, D. (author), Spronck, J.W. (author), Van der Zant, H.S.J. (author), Venstra, W.J. (author)
We have used double clamped beams to implement a mechanical memory. Compressive stress is generated by resistive heating of the beams and beyond the buckling limit the bistable regime is accessed. Bits are written by applying lateral electrostatic forces. The state of the beam is read out by measuring the capacitance between beam and electrodes....
journal article 2009
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Van der Aa, E.M. (author)
One of the major problems during welding of thin plate structures is the occurrence of buckling distortion. This type of distortion is caused by the formation of compressive welding stresses; when these stresses exceed a certain critical stress level, the structure will buckle. Most methods for eliminating the welding induced buckling distortion...
doctoral thesis 2007
document
Seresta, O. (author)
This research work deals with the design and optimization of a large composite structure. In design of large structural systems, it is customary to divide the problem into many smaller independent/semi-independent local design problems. The use of composite necessitates the inclusion of ply angles as design variables. These design variables are...
doctoral thesis 2007
document
Notenboom, R.P. (author)
Abstract not available
doctoral thesis 2006
document
Jansen, E.L. (author)
doctoral thesis 2001
document
Jamal, A. (author)
doctoral thesis 1998
document
Karyadi, E. (author)
doctoral thesis 1998
document
Van, M.A. (author)
doctoral thesis 1997
document
Van, M.A. (author)
Continuous welded rail track, compared to jointed track not only reduces maintenance costs, but also increases life time of track components and the comfort of passengers. Since expansion of the rails is hardly possible in CWR-track, a temperature increase will result in high compressive stresses and track buckling may occur. Therefore the ...
journal article 1996
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Verolme, J.L. (author)
doctoral thesis 1995
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Deerenberg, E. (author)
doctoral thesis 1994
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de Boer, A. (author), Riks, E. (author)
In this report a description is given of the nonlinear package of B2000. The set-up of the continuation procedure which controls the nonlinear calculations is explained. At some points the existing continuation procedure was modified to enhance its performance. The nonlinear package contains a nonlinear rod element and a nonlinear thick shell...
report 1988
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