Journal ArticleDOI
Experimental investigation on advanced composite-stiffened structures under uniaxial compression and bending
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In this article, the theoretical analysis of the compression panels is based on both wide column and simply supported orthotropic plate theory to predict overall buckling, on orthotropic buckling equations to predict local buckling and on a torsional instability theory for the blade-stiffened panels.Abstract:
Several tests were conducted on graphite/epox y hat-arid blade-stiffened panels under uniaxial compression and wing-box beams under pure bending to verify the accuracy of the theoretical analysis. Theoretical analysis of the compression panels is based on both wide column and simply supported orthotropic plate theory to predict overall buckling, on orthotropic buckling equations to predict local buckling, and on a torsional instability theory for the blade-stiffened panels. Adequate correlations with experimental results were obtained for uniaxial compression when the Euler or torsional buckling modes were critical; buckling occurred at lower strain values than predicted when the local buckling mode was critical. Indeed, simple compression tests cannot represent the load conditions of wing-box compression panels properly; in particular, the bending curvature causes a distributed load perpendicular to panels that can reduce the longitudinal load at which buckling occurs.read more
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Recent advances in analysis of laminated beams and plates. Part I - Sheareffects and buckling.
Rakesh K. Kapania,Stefano Raciti +1 more
Abstract: A review of the recent developments in the analysis of laminated beams and plates with an emphasis on shear effects and buckling is presented. A discussion of various shear-deformation theories for plates and beams is given. The available theories are derived assuming a variation of either the in-plane displacement components or the stress components or both in the thickness coordinate. A review of the recently developed finite elements to analyze thin and thick laminated beams and plates is given next. These elements have been derived using the displacement methods, or the mixed methods or the hybrid methods. Recent studies on the buckling and postbuckling behavior of perfect and geometrically imperfect plates are described next. These behaviors have been studied using analytical, numerical, and experimental techniques. Finally, a review of the various studies on the delamination buckling and growth in beams and plates is given. Once again, the studies have been conducted using analytical, numerical, and experimental techniques. The energy release rates have been determined using closed-form solutions or using numerical differentiation. Mention also is made of studies on multiple delaminations and on dynamic response of composite laminates under impact loads.
Journal ArticleDOI
Buckling and postbuckling of composite structures
TL;DR: In this article, the postbuckling behavior of a flat, stiffened, carbon fiber composite compression panel has been studied, theoretically and experimentally, and an initial failure mechanism leading to eventual explosive collapse of the panel is identified and the damaging stress resultant is measured in the panel and predicted from a finite element analysis.
Journal ArticleDOI
Postbuckling and failure of stiffened composite panels under axial compression
TL;DR: In this article, the postbuckling behavior of graphite-epoxy laminated stiffened panels has been studied analytically and experimentally using the nonlinear finite element method.
Journal ArticleDOI
Manufacture and performance evaluation of the composite hat-stiffened panel
TL;DR: In this paper, composite hat-stiffened panels were made using the co-curing, co-bonding and secondary bonding processes, and their geometric accuracies and mechanical properties were evaluated.
Journal ArticleDOI
Post-buckling behaviour of graphite/epoxy stiffened panels with initial imperfections subjected to eccentric biaxial compression loading
Giulio Romeo,Giacomo Frulla +1 more
TL;DR: In this paper, a non-linear analysis is developed for symmetric panels under biaxial compression in order to obtain the out-of-plane panel deflection in the post-buckling range.
References
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Journal ArticleDOI
Buckling and vibration of anisotropic or isotropic plate assemblies under combined loadings
W.H. Wittrick,F.W. Williams +1 more
TL;DR: In this article, a general-purpose computer program, VIPASA, is presented for determining the critical buckling stresses or natural frequencies of vibration of thin prismatic structures, consisting of a series of plates rigidly connected together along longitudinal edges.
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General Panel Sizing Computer Code and Its Application to Composite Structural Panels
TL;DR: Comparisons with previously published experimental data show that accounting for imperfections improves correlation between theory and experiment and is applicable to general cross sections under general loading conditions causing buckling.
Journal ArticleDOI
General sinusoidal stiffness matrices for buckling and vibration analyses of thin flat-walled structures
TL;DR: In this paper, the authors derived stiffness matrices for the buckling or vibration analysis of any structure consisting of a series of long, thin, flat plates rigidly connected together at their longitudinal edges.
Minimum-Mass Design of Filamentary Composite Panels under Combined Loads: Design Procedure Based on Simplified Buckling Equations.
W. J. Stroud,Nancy Agranoff +1 more
TL;DR: In this paper, an analytical procedure for designing hat stiffened and corrugated panels made of composite material and subjected to longitudinal compression and shear loadings is presented, based on nonlinear mathematical programming techniques and a simplified set of buckling equations.