This research outlines a procedure for analyzing the torsional stiffness of a tube frame chassis design. The analysis utilizes finite element model simulation of the tube frame to identify areas where existing member stiffness could be increased or where new members could be added to result in a significant increase in overall frame stiffness. Key to the procedure is the determination of locations of high strain energy density for a given load case. These locations of high strain energy density identify areas where member stiffness can be increased or where additional members could be located. Member stiffness can be increased by increasing the size or the thickness of the tube cross-section. The procedure can be performed with linear static analysis, however, more information can be gained when using linear dynamic analysis. The procedure can ultimately be combined with structural optimization to yield a frame design having maximum stiffness and minimum weight. The analyses presented herein concern a Formula 2000 tube frame chassis design (see Figure 1). It should be noted that the analysis is also applicable and appropriate for other tube frame chassis designs or monocoque chassis designs.
