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Homework Help: Torsion question can anyone help?

  1. Sep 15, 2010 #1
    Torsion question can anyone help???

    1. The problem statement, all variables and given/known data
    For a power transmission system, a solid steel shaft is required to transmit a torque of 2000 Nm. The limiting factor is that the twist of the shaft should not exceed 5 degrees for each metre of the shaft length. The shear modulus G is 75 GPa for this steel. What should be the minimum shaft diameter??


    2. Relevant equations
    The general bending formula
    T/J=Tau/r=Gxtheta/L

    3. The attempt at a solution
    I tried to use the bending formula and come up with 14mm minimum diameter shaft
     
  2. jcsd
  3. Sep 15, 2010 #2

    rock.freak667

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    Re: Torsion question can anyone help???

    Your equation is the torsion equation, but could you post your working, I don't have a calculator on hand to check your answer.
     
  4. Sep 16, 2010 #3

    nvn

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    scw1: Your equation in post 1 is correct, but your current answer is incorrect. Ensure you are using correct units, and ensure you are using the correct equation for J. Try again.
     
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