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stiffness matrix for torsional beam

I would like to know how to write a stiffness matrix for a bar under torsional load. I would like to write a code in C++ to do this. I would like to know of any material regarding this.

Thanks in advance

With Br



Wenbin Yu's picture

This problem has been solved for bar with arbitrary cross-sectional shape and arbitrary material including composites. A general-purpose cross-sectional analysis tool VABS , is also avaible for computing not only torsional stiffness but also all the other stiffness including coupling coefficients between different deformation modes.

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