| Summary: Thin-walled structures are widely used in the automobile and transportation industry due to their lightweight and high-energy absorption. Especially thin-walled structures with filling materials have received much attention in energy absorption alications. Therefore, in this study, empty and foam-filled square tapered tailor-welded tubes was investigated the dynamic behaviour under axial impact load. The finite element method and meshless smooth particle hydrodynamics method (SPH) was used together for foam-filled tailor-welded tubes in all simulations. It was assumed that tailor-welded tubes composed of a single material (AISI1018 or AL6061) or two different materials (AL6061 & AISI1018) by joining end to end with tailor welding while the foam-filler material was made of aluminium. Analyses of tubes were performed with different taper angle, welding area, thickness of the uer part and foam density under axial impact loading. In a result of numerical simulations, graphs of specific energy absorption (SEA), the peak force (BMK) and crashworthiness force efficiency (CFE) was obtained. In addition to, optimum values of tube thickness and foam density were determined by using the forward neural network and genetic algorithm. The results of the simulations indicated that meshless SPH method and forward neural network for optimization of tubes have been successfully employed. Also, the peak force significantly decreased in the straight and tapered tubes composed of different two materials while the absorbed energy increased.
Keywords: Tailor-Welded Tube, Finite Element Method, Smooth Particules Hydrodinamics, Optimization
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