Abstract
This article introduces a novel square cross-section thin wall column (TWC) to enhance crashworthiness under axial loading. The wall thickness of the square cross-section TWC was symmetrically designed to increase crashworthiness. This type of TWC is known as variable thickness (VT) TWC. Crashworthiness performance was measured using indicators such as energy absorption (EA), specific energy absorption (SEA), and crash force efficiency (CFE). The uniform thickness (UT) cross-section TWC was employed for experimental testing and analytical evaluation, and its crashworthiness performance was considered a benchmark for this study. The experimental test was simulated in ABAQUS explicit dynamic software, and experimental, numerical, and analytical results were all compared. The same simulation model was used for subsequent investigations on VT-TWC. In order to find the most effective VT-TWC, which has the highest SEA and CFE indicators, the multi-objective optimization problem was formulated using a surrogate model and response surface technique. The Non-dominated Sorting Genetic Algorithm (NSGA-II) was employed to solve the multi-objective problem for maximized SEA and CFE. From the results, it was predicted that the VT-TWC performs significantly better than the UT-TWC, saving around 15.63% of the material with 0.45% and 9.5% higher SEA and CFE, respectively.
Published Version
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