Experimental and Numerical Study of Crushing Behavior of Multi-Walled Polygonal Cross section Tubes Using COPRAS Multi Criteria Decision Making Algorithm

Thin-walled structures have been extensively studied as energy absorbing components. Their light-weight along with deformation pattern has made them suitable components for crashworthiness purposes. In this study three types of Structures with double Cylindrical, Rectangular and Hexagonal thin-walled are investigated using experimental tests as well as numerical simulation. At first, a comparison is made between multi-cell tubes with different cell size, cross sections and loading angles. To create reliable comparison sets of structures, ratios of length (diameter) of the outer shell to length (diameter) of the inner shell (L1/L2) of the structures have been chosen. After acquiring data from ls-dyna software the COPRAS Multi criteria decision making(MCDM) algorithm is used to choose the best design.