One of the important measures in race car design is torsional stiffness. To obtain that specification, a twist test must be performed on the chassis. The figure below shows a simplified version of a race car chassis with a composite monocoque and two front suspension links. To simulate a twist test, the back of the monocoque will be fixed while coupling will be applied to the end of the two front suspensions.
One of the advantage of composite materials is that you can customize the ply lay-ups to achieve optimum properties according to your needs. It is often the case where different ply lay-ups are used at different monocoque regions for their specific needs. This exercise has four different regions as shown in the above diagram. Details of the composite layup will be explained during the exercise.
In this module, we will calculate torsional displacement with the use of Ansys PrepPost and Ansys Mechanical. Torsional stiffness will then be calculated using the following equations:
In order to do this exercise, you must have Ansys Composite PrepPost installed. All video tutorials contain audio instructions.