Paz Méndez, JavierDíaz, J.Romera, LuisTeixeira-Dias, F.2020-02-142020Paz, J., Díaz, J., Romera, L. et al. Struct Multidisc Optim (2020) 61: 141. https://doi.org/10.1007/s00158-019-02350-3http://hdl.handle.net/2183/24912[Abstract] This research concerns the crashworthiness enhancement of a model of a Boeing 737-200 fuselage section. Using a validated numerical specimen, four thin-walled crushable hybrid energy absorbers are added to the aircraft to work as vertical struts. The absorbers are composed of a hollow aluminium tube, a star-shaped glass fibre–reinforced polymer inner matrix and foam extrusions. The absorbers—with variable tube edge and thickness, composite thickness and core height—are single- and multi-objectively optimised. Surrogate models and genetic algorithms are used for the minimisation of acceleration loads, injury levels and the strut’s weight. Results yield a more efficient frames’ collapse evolution with plastic dissipation increased by over 50%. Consequently, acceleration peaks are up to 50% lower at the two measured locations while maintaining low mass values. Injury levels were also reduced from severe to moderate according to an Eiband diagram.engAircraft designCrashworthinessHybrid energy absorbersBiometric criteriaMulti-objective optimizationSurrogate modelsGenetic algorithmsjournal articleopen access10.1007/s00158-019-02350-3