The single perturbation load approach applied to imperfection sensitive conical composite structures |
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| Affiliation: | 1. DLR, Institute of Composite Structures and Adaptive Systems, Lilienthalplatz 7, 38108 Braunschweig, Germany;2. UNSW, University of New South Wales, High St, Kensington, NSW 2052, Australia;3. PFH, Private University of Applied Sciences Göttingen, Composite Engineering Campus Stade, Germany;1. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116023, China;2. Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China;1. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116023, China;2. Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China;1. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116023, China;2. Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China;1. INVENT GmbH, Christian-PommerStrasse 34, 38112 Braunschweig, Germany;2. DLR, Institute of Composite Structures and Adaptive Systems, Lilienthalplatz 7, 38108 Braunschweig, Germany;3. EMBRAER, Brazilian Aerospace Company, 12227-901 São José dos Campos, SP, Brazil;4. PFH, Private University of Applied Sciences Göttingen, Composite Engineering Campus Stade, Germany |
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| Abstract: | The importance of taking into account geometric imperfections for cylindrical and conical thin-walled structures prone to buckling had been already recognized by the first authors dealing with new formulations. Nowadays, the analysts still use empirically based lower-bound methods such as the NASA SP-8007 guideline to calculate the required knock-down factors (KDFs), which does include important mechanical properties of laminated composite materials, such as the stacking sequence. New design approaches that allow taking full advantage of composite materials are required.The single perturbation load approach (SPLA), a new deterministic approach first proposed by Hühne, will be investigated with unstiffened composite conical structures varying the geometry, lamina and layup. The SPLA?s capability for predicting KDF is compared with the NASA approach. The SPLA was applied to the geometrically perfect structures and to the structure with geometric imperfections of two types, mid-surface imperfections and thickness imperfections. The study contributes to the European Union (EU) project DESICOS, whose aim is to develop less conservative design guidelines for imperfection sensitive thin-walled structures. |
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| Keywords: | Buckling Knock-down factor Design Composite Imperfections Truncated conical shell |
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