Buckling is a critical failure phenomenon for structures, and represents a threat for thin shells subjected to compressive forces. The global buckling load, for a conical structure, depends on the geometry and material properties of the shell, on the stacking sequence, on the type of applied load and on the initial geometric imperfections. Geometric imperfections, occurring inevitably during manufacturing and assembly of thin-walled composite structures, produce a reduction in the carrying load capability with respect to the design value. This is the reason why investigating these defects is of major concern in order to avoid over-conservative design structures. In this paper, the buckling behavior a conical structure with 45° semi-vertical angle is numerically investigated. The initial imperfections are taken into account by using different strategies. At first, the Single Perturbation Load Approach (SPLA), which accounts for defects in the form of a lateral load, normal to the surface, has been adopted. Then, the actual measured defects have been applied to the structure by using the Real Measured Mid-Surface Imperfections (MSI) approach. Investigations on cylindrical shells using the first strategy have already shown the occurrence of a particular phenomenon called “local snap-through”, which represents a preliminary loss of stiffness. In order to better understand this phenomenon for conical shells, both the aforementioned techniques have been used to provide an exhaustive overview of the imperfections sensitiveness in conical composite shells. This study is related to part of the work performed in the frame of the European Union (EU) project DESICOS.
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Weingarten, M.: Seide, elastic stability of thin-walled cylindrical and conical shells under axial compression. AIAA Journal, v. 3, N. 3
Hühne, C., Rolfes, R., Breitbach, E., Teßmer, J.: Robust design of composite cylindrical shells under axial compression - simulation and validation. Thin-Walled Struct. 46, 947–962 (2008)
Arbelo, M.A., Degenhardt, R., Castro, S.G.P., Zimmermann, R.: Numerical characterization of imperfection sensitive composite structures. Compos. Struct. 108, 295–303 (2014)
Arbelo M. A., Zimmermann R., Castro S. G. P., Degenhardt R, Comparison of new design guidelines for composite cylindrical shells prone to buckling, in 9th International Conference on Composite Science and Technology, Sorrento, Naples, Italy, (2013)
Khakimova R., Castro S., Arbelo M., Degenhardt R., Rohwer K., Zimmermann R., Quappen G., Hinsch S.: Studies of impefection sensitive conical composite structures, Proceedings of the 21st International Annual Conference on Composites Engineering (ICCE 21) in Tenerife, Spain, 21–27 July, (2013)
Castro, S.G.P., Zimmermann, R., Arbelo, M.A., Khakimova, R., Hilburger, M.W., Degenhardt, R.: Geometric imperfections and lower-bound methods used to calculate knock-down factors for axially compressed composite cylindrical shells. Thin-Walled Struct. 74, 118–132 (2014)
Castro, S.G.P., Arbelo, M.A., Zimmermann, R., Degenhardt, R.: Exploring the constancy of the global buckling load after a critical geometric imperfection level in thin-walled cylindrical shells for less conservative knock-down factors. Thin-Walled Struct. 72, 76–87 (2013)
Orifici, A.C., Bisagni, C.: Perturbation-based imperfection analysis for composite cylindrical shells buckling in compression. Compos. Struct. 106, 520–528 (2013)
Di Pasqua M.F., Khakimova R., Castro S. G. P., Arbelo M. A., Riccio A., Degenhardt R. The influence of geometrical parameters on the buckling behavior of conical shell by the single perturbation load approach. Applied Composite Materials, Vol 22, Issue 4, pp 405–422
Degenhardt R, Kling A, Klein H, Hillger W, Goetting H. C., Zimmermann R, Rohwer K: Experiments on buckling and postbuckling of thin-walled CFRP structures using advanced measurement systems, Int. J. Structural Stability Dynamics, (2007)
D.S. ABAQUS User’s manual, Abaqus analysis user’s manual (2011)
Geier, B., Meyer-Piening, H., Zimmermann, R.: On the influence of laminate stacking on buckling of composite cylindrical shells subjected to axial compression. Compos. Struct. 55, 467–474 (2002)
The research leading to these results has received funding from the European Community’s Seventh Framework Programme (FP7/2007–2013) under Priority Space, Grant Agreement no.282522 (www.DESICOS.eu). The information in this paper reflects only the author’s views and the European Community is not liable for any use that may be made of the information contained therein.
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Di Pasqua, M.F., Khakimova, R., Castro, S.G.P. et al. Investigation on the Geometric Imperfections driven Local Buckling Onset in Composite Conical Shells. Appl Compos Mater 23, 879–897 (2016). https://doi.org/10.1007/s10443-016-9490-7