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Crashworthiness optimization of the multi-cell square tubes subjected to oblique impact were studied in this work. For these structures, crashworthiness indicators SEA and PCF are numerically
obtained using finite element code HYPERMESH/LS-DYNA. Pareto fronts using a combination of response surface (RS) model and Non-dominated Sorting Genetic Algorithm II (NSGA-II) are obtained. A “better solution” (so-called knee point) from Pareto front with maximizing the reflex angle is determined. The result of this work will assist the design of multi-cell tubes with better crashworthiness performance.