Truck Chassis Design

The objective of paper is to find out best material and most suitable cross-section for a Truck ladder chassis with the constraints of maximum shear stress, equivalent stress and deflection of the chassis under maximum load condition. In present the Ladder chassis which are used for making buses and trucks are C and I cross section type, which are made up of Steel alloy (Austenitic). In India number of passengers travel in the bus is not uniform, excess passengers are travelling in the buses daily due to which there are always possibilities of being failure/fracture in the chassis/frame. Therefore Chassis with high strength cross section is needed to minimize the failure including the factor of safety in design. In the present work, we have taken higher strength as the main issue, so the dimensions of an existing vehicle chassis .Truck is taken for analysis with materials namely ASTM A710 Steel, ASTM A302 Alloy Steel and Aluminum Alloy 6063-T6 subjected to the same load. The different vehicles chassis have been modeled by considering three different cross-sections namely C, I and Rectangular Box (Hollow) type cross sections. The problem to be dealt for this dissertation work is to Design and Analyze using suitable CAE software for ladder chassis. The report is the work performed towards the optimization of the automobile chassis with constraints of stiffness and strength. The modeling is done using the Catia, and analysis is done using the Ansys . The overhangs of the chassis are calculated for the stresses and deflections analytically are compared with the results obtained with the analysis software. Keywords: Automobile chassis, chassis loads, modeling, structural analysis.