Journal ArticleDOI
The effect of a centrally located midplane delamination on the instability of composite panels
G. Siefert,Anthony N. Palazotto +1 more
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In this article, the buckling loads of eight-ply graphite-epoxy cylindrical panels with midplane delamination were determined experimentally, and the experimental test results are compared to the linear bifurcation and nonlinear collapse loads of panels with square cutouts obtained from the STAGSC-1 finite-element computer code.Abstract:
The buckling loads of eight-ply graphite-epoxy cylindrical panels with midplane delamination were determined experimentally. The study included two different ply orientations, two different aspect ratios, two different delamination sizes, and one set of boundary conditions; clamped along the top and bottom edges and simply supported along the vertical sides. The experimental test results are compared to the linear bifurcation and nonlinear collapse loads of panels with square cutouts obtained from the STAGSC-1 finite-element computer code.read more
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Journal ArticleDOI
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
Functionally Graded Cylindrical Shell Thermal Instability Based on Improved Donnell Equations
R. Shahsiah,Mohammad Reza Eslami +1 more
TL;DR: In this paper, the thermal instability of cylindrical shells of functionally graded material is considered and the derivation of equations is based on first-order shell theory and the complete Sanders kinematic equations.
Journal ArticleDOI
The use of stereo X-ray and deply techniques for evaluating instability of composite cylindrical panels with delaminations
TL;DR: The buckling loads of eight-ply AS4/3501-6 graphite/epoxy cylindrical panels with delaminations were determined experimentally as discussed by the authors, and they were found to be approximately five percent weaker than a single delaminated area of the same total size.
Proceedings ArticleDOI
3elamination buckling and growth in axially loaded bean-plates
TL;DR: In this paper, a simple one-dimensional model is used to analyze delamination buckling, postbuckling, and growth in a xially-loaded beam-plates, and an explicit finite element method is employed to determine the linear buckling load and energy-release rate, and from these t he dltimate axial load can then be determined.
Book ChapterDOI
Delamination Buckling of Plate and Shell Structures
TL;DR: In this paper, a review of the effect of the presence of imperfections and defects on buckling in laminated configurations is presented, and the simple mathematical models that have been used for the buckling analysis of delaminated plates and shells are identified.
References
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Journal ArticleDOI
One dimensional modelling of failure in laminated plates by delamination buckling
TL;DR: In this paper, a first attempt by a delaminating beam-column was modeled by a fracture mechanics-based energy release rate criterion, where the local delamination growth, stability, and arrest were governed by the fracture mechanics.
Journal ArticleDOI
The effect of general imperfections on the buckling of cylindrical shells
Johann Arbocz,C. D. Babcock +1 more
TL;DR: In this article, an experimental and theoretical investigation of the effect of general imperfections on the buckling load of a circular cylindrical shell under axial compression was carried out.
Journal ArticleDOI
Ultimate axial load capacity of a delaminated beam-plate
TL;DR: In this article, elastic buckling and postbuckling analysis of an axially loaded beam-plate with an across-the-width delamination symmetrically located at an arbitrary depth is presented.
Journal ArticleDOI
Axisymmetric buckling and growth of a circular delamination in a compressed laminate
TL;DR: In this article, an iterative procedure based on the fourth-order Runge-Kutta integration formula is used to generate a family of non-dimensionalized postbuckling solutions of von Karman's nonlinear plate theory.
Thin-Shell Structures: Theory, Experiment, and Design.
TL;DR: The Symposium on Thin Shell Structures: Theory, Experiment and Design as mentioned in this paper was held in Pasadena, California from June 29 to 30, 1972, with the emphasis on experimental evaluation of the theories, and on practical concerns for shell design.
Related Papers (5)
Finite element delamination model for vibrating composite spherical shell panels with central cutouts
Sang-Youl Lee,Dae-Seouk Chung +1 more