caa a22 4500 463243552 CHVBK 20180405153319.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s00158-006-0066-2 doi (NATIONALLICENCE)springer-10.1007/s00158-006-0066-2 Reinforcement layout and sizing optimization of composite submarine sail structures [Elektronische Daten] [M. Rais-Rohani, J. Lokits] A topology optimization approach that makes use of nonlinear design variable-to-sizing relationship is presented. A finite element (FE) model is used to describe the loaded structure, but unlike the microstructure approach, the decision is whether an element in the continuum should have maximum or minimum cross-sectional dimension while its material density and moduli are held constant. This approach is applied to reinforcement layout optimization of a very large and geometrically complex Composite Advanced Sail (CAS) structure under an asymmetric wave slap loading condition. A high-complexity model in the form of multilayered shell and a low-complexity model in the form of stiffened shell are developed for the layout optimization of the CAS and solved for minimum strain energy. The effects of constraints such as buckling instability on optimal placement of internal stiffeners are also explored. Based on the results of the layout optimization, a new FE model of the CAS is developed and optimized for minimum weight. Depending upon the degree of variability in skin thickness, the results show a weight saving of up to 19% over the original model. Springer-Verlag Berlin Heidelberg, 2006 Reinforcement layout optimization nationallicence Topology optimization nationallicence Sizing optimization nationallicence Optimization of composite structures nationallicence Buckling constraints nationallicence Marine structures nationallicence Rais-Rohani M. Department of Aerospace Engineering, Mississippi State University, 39762, Mississippi State, MS, USA aut Lokits J. Department of Aerospace Engineering, Mississippi State University, 39762, Mississippi State, MS, USA aut Structural and Multidisciplinary Optimization Springer-Verlag 34/1(2007-07-01), 75-90 1615-147X 34:1<75 2007 34 158 https://doi.org/10.1007/s00158-006-0066-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00158-006-0066-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rais-Rohani M. Department of Aerospace Engineering, Mississippi State University, 39762, Mississippi State, MS, USA aut NATIONALLICENCE 700 1- Lokits J. Department of Aerospace Engineering, Mississippi State University, 39762, Mississippi State, MS, USA aut NATIONALLICENCE 773 0- Structural and Multidisciplinary Optimization Springer-Verlag 34/1(2007-07-01), 75-90 1615-147X 34:1<75 2007 34 158 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer