I have having dificulty in determining the torsional capacity of a square HSS section. I am designing a shaft for 9.5 cubic yard mixer powered by a 80hp drive at 6 rpm output.(adsbygoogle = window.adsbygoogle || []).push({});

I have calculated the applied torque to be70,000 ft-lbs (95 kNm). I would like to determine the size of HSS required if I use both 319 Stainless (Fv = 103 MPa) and 350W Mild Steel (Fv = 210 MPA) [Fv = allowable shear stress]. I will be comparing both materials as both offer advantages.

Is there a way to use the Torsional Constant [J] to determine allowable torque on a section? I have been able to calculate the required capacity for solid round, hollow round, and solid square sections. The method to determine the allowable torque on a hollow square shaft eludes me! It is my hypothesis that a 10x10x1/2" S.S. HSS will suffuce however I am not certain.

Any advise or direction would be greatly appreciated!

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Calculating Torsional Capacity of Square HSS

**Physics Forums | Science Articles, Homework Help, Discussion**