Torsional Constant For A Ladder Chassis
Torsional Constant For A Ladder Chassis
(OP)
Hey guys! I'm currently designing a ladder chassis for a vehicle design assignment. I'm having troubles finding the torsional constant, J of a ladder chassis which is needed to find the torsional stiffness.
The ladder chassis will consist of 2 side members and 3 cross-members spaced equally along its length.
All the members are C-sections.
Am I suppose to sum up all the area moment of inertias, e.g. J = 2*I(side member) + 3*I(crossmember)
OR
Is this analysis only possible using a software?
The ladder chassis will consist of 2 side members and 3 cross-members spaced equally along its length.
All the members are C-sections.
Am I suppose to sum up all the area moment of inertias, e.g. J = 2*I(side member) + 3*I(crossmember)
OR
Is this analysis only possible using a software?





RE: Torsional Constant For A Ladder Chassis
RE: Torsional Constant For A Ladder Chassis
How about if I simplify the model by using a frame with only 2 cross-members located at both ends (essentially making it a square when viewed from top). Is it possible to find the torsional stiffness by hand now?
RE: Torsional Constant For A Ladder Chassis
C and I sections are used when Low torsional stiffness is sometimes desirable.
http://www.vanpeltsales.com/FH_web/FH_images/FH_ch...
http://ww2.justanswer.com/uploads/molurch/2010-11-...
Omer Blodgett says open section lateral Crossmembers don't add much.
http://weldingdesign.com/archive/no-twisters-or-sw...
More detailed info in Lincoln Electric's bargain Design of Weldments.
http://www.jflfoundation.com/ProductDetails.asp?Pr...
As I recall simply "boxing" the channels increased torsional stiffness