The double-hat-shaped magnesium tube was difficult to use in actual applications due to its frangible material property.Magnesium alloy and traditional steel were integrated into a new hybrid thin-walled double-hat-sh...The double-hat-shaped magnesium tube was difficult to use in actual applications due to its frangible material property.Magnesium alloy and traditional steel were integrated into a new hybrid thin-walled double-hat-shaped tube to improve vehicle crashworthiness.Two classes of hybrid tubes were examined,namely Hybrid-I(steel top hat and magnesium alloy bottom hat)and Hybrid-II(magnesium alloy top hat and steel bottom hat).The energy absorption characteristics and crashworthiness optimization of the thin-walled hybrid structures were investigated under three-point bending conditions through experiments and simulations.Multi-objective optimization design for the two hybrid tubes was implemented to elucidate their lightweight properties.Results showed that the specific energy absorption of Hybrid-I tube and Hybrid-II tube was approximately 44.7%and 12.7%higher than that of the double-hat-shaped DC04 tube,respectively.The Hybrid-I tube had better crashworthiness and lightweight properties compared with Hybrid-II tube.Hybrid-I tube also had better lightweight properties than single-material steel tube and reduced wall thickness compared with magnesium alloy tube.展开更多
基金the National Natural Science Foundation of China(51405060).
文摘The double-hat-shaped magnesium tube was difficult to use in actual applications due to its frangible material property.Magnesium alloy and traditional steel were integrated into a new hybrid thin-walled double-hat-shaped tube to improve vehicle crashworthiness.Two classes of hybrid tubes were examined,namely Hybrid-I(steel top hat and magnesium alloy bottom hat)and Hybrid-II(magnesium alloy top hat and steel bottom hat).The energy absorption characteristics and crashworthiness optimization of the thin-walled hybrid structures were investigated under three-point bending conditions through experiments and simulations.Multi-objective optimization design for the two hybrid tubes was implemented to elucidate their lightweight properties.Results showed that the specific energy absorption of Hybrid-I tube and Hybrid-II tube was approximately 44.7%and 12.7%higher than that of the double-hat-shaped DC04 tube,respectively.The Hybrid-I tube had better crashworthiness and lightweight properties compared with Hybrid-II tube.Hybrid-I tube also had better lightweight properties than single-material steel tube and reduced wall thickness compared with magnesium alloy tube.
