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General formula for torsion section modulus

General formula for torsion section modulus

General formula for torsion section modulus

(OP)
Hello,
Is there one single formula which can give the torsional section modulus for all shapes (either solid or hollow)? I want to write a script for the same.
Dividing the polar moment of inertia with the extreme fiber doesn't give the right results for all shapes.
Regards,
Su

RE: General formula for torsion section modulus

at a minimum I think you'll need different expressions for open or closed sections.

another day in paradise, or is paradise one day closer ?

RE: General formula for torsion section modulus

For open sections, you can use J≈ Σ(bt3/3) [where b/t ≥10]

where b= length of each cross-sectional element & t= thickness of each cross-sectional element

For closed sections, there are various formulas.

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