Abstract
Double-hat beam is a lightweight and high-performance bending-resistant structure. In this work, the impact performance of a double-hat beam under dynamic three-point bending load is verified by drop weight tests. Three geometric parameters and splines are applied to obtain many novel cross-section shapes to improve the crashworthiness of double-hat beams. Compared with double-hat beam, the mean crushing force (MCF) of DB42-51-6 is increased by 45.4%, and the specific mean crushing force (SMCF) of DB22-46-41 is increased by 15.3%. It is also found that quadrangular cross-sections outperform rectangular ones, rectangular cross-sections outperform cruciform ones, and elliptical cross-sections perform the worst. The impact performance of butterfly shaped cross-sections is better than that of rectangular and gourd-shaped ones, and convex corner is conducive to improving the bending resistance of double-hat beam compared with the concave corner. Three cross-sections are selected for multi-objective optimisation to improve their crashworthiness, and multiple sets of Pareto solutions are obtained and presented in supplementary file to provide a variety of feasible solutions. These results have important implications for the impact performance design of double-hat structures and vehicle bodies.
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