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I'm a mech eng student doing a project on torsional rigidity of a space frame chassis.

I know how to calculate the twist angle and torsional rigity at the point where the force is applied but I'm struggling to visualise and understand how I can calculate the twist angles along the length of the chassis. Normally you would take the distance between the force and pivot and the y axis displacement to get the angle, but what horizontal distance would you use at different points along the chassis? To explain better I've attached a image of the base of my chassis.

I've marked the points where I want to get the twist angles with X's

FYI - I'm using Abaqus to do the FEA analysis which gives me the vertical displacement values

Thanks

http://img141.imageshack.us/img141/4103/captureji.png [Broken]

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# Twist angle of chassis

Can you offer guidance or do you also need help?

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