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NASA Technical Reports Server (NTRS) 19990032293: Optimal Design of... |
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by NASA Technical Reports Server (NTRS) |
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A design strategy for optimal design of composite grid- |
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stiffened cylinders subjected to global and local |
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buckling constraints and strength constraints was |
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developed using a discrete optimizer based on a genetic |
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algorithm. An improved smeared stiffener theory was used |
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for the global analysis. Local buckling of skin segments |
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were assessed using a Rayleigh-Ritz method that accounts |
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for material anisotropy. The local buckling of stiffener |
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segments were also assessed. Constraints on the axial |
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membrane strain in the skin and stiffener segments were |
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imposed to include strength criteria in the grid- |
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stiffened cylinder design. Design variables used in this |
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study were the axial and transverse stiffener spacings, |
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stiffener height and thickness, skin laminate stacking |
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sequence and stiffening configuration, where stiffening |
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configuration is a design variable that indicates the |
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combination of axial, transverse and diagonal stiffener |
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in the grid-stiffened cylinder. The design optimization |
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process was adapted to identify the best suited |
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stiffening configurations and stiffener spacings for grid- |
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stiffened composite cylinder with the length and radius |
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of the cylinder, the design in-plane loads and material |
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properties as inputs. The effect of having axial membrane |
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strain constraints in the skin and stiffener segments in |
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the optimization process is also studied for selected |
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stiffening configurations. |
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Date Published: 2016-10-15 11:41:34 |
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Identifier: NASA_NTRS_Archive_19990032293 |
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Item Size: 17574870 |
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Language: english |
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Media Type: texts |
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