Akış, TolgaAzad, Saeid KazemzadehAkis, TolgaAzad, Saeıd KazemzadehCivil EngineeringDepartment of Civil Engineering2024-07-052024-07-05201932228-61872364-183510.1007/s40997-018-0170-02-s2.0-85067597233https://doi.org/10.1007/s40997-018-0170-0https://hdl.handle.net/20.500.14411/3337Akis, Tolga/0000-0002-6754-4497; Kazemzadeh Azad, Saeid/0000-0001-9309-607XThis paper addresses the effect of shrink-fitting on the optimal design of pressurized multi-layer composite tubes. Analytical solutions for structural response calculations are provided for axially constrained two- and three-layer shrink-fitted tubes under both internal and external pressure. A recently developed numerical evolutionary optimization algorithm is employed for weight and cost minimization of these assemblies. In order to investigate the effect of shrink-fitting, first, optimal material selection and thickness optimization of tightly fitted tubes, under either internal or both internal and external pressure, are accomplished without shrink-fitting. Next, under the same loading and boundary conditions the assemblies are optimized where shrink-fitting parameters are taken into account for weight and cost minimization. The numerical results obtained for multi-layer composite tubes with and without shrink-fitting indicate that more economical or lightweight assemblies can be obtained if shrink-fitting parameters are treated as additional design variables of the optimization problem. Furthermore, it is observed that considering the shrink-fitting parameters for optimal design becomes more advantageous in the test cases with a higher ratio of internal pressure to external pressure.eninfo:eu-repo/semantics/closedAccessShrink-fittingComposite assemblyMulti-layer composite tubesOptimum designDiscrete optimizationMetaheuristicsArticleQ4Q343451467WOS:000472062900035