Multi-criteria selection methods (MCDM) for lower bumper stiffener material change in a Sports Utility Vehicle with CAE simulation

Abstract

This article describes the steps to replace the lower bumper stiffener material of a sport utility vehicle. It was taken as the main characteristics to obtain the behaviour principles as the lower bumper stiffener. A static structural simulation was developed according to the regulation of physical trials of the EuroNCAP. Three multi-criteria selection methods called TOPSIS, VIKOR and ENTROPY were applied. Polylactic acid was determined as the optimal material. A dynamic simulation between of the contact of the leg form impactor and pedestrian protection system, at a speed of 40 km/h was performed. The simulation evaluates the acceleration of the tibia, equivalent strain of Von Misses and deformation in the three nodes of the lower bumper stiffener. It was determined that the optimal material is the PLA, where it is appreciated that the main factors to consider for the decision making is the acceleration and the nodal deformation of the dynamic simulation.