dear all, i have just received a question about torsion.(adsbygoogle = window.adsbygoogle || []).push({});

1. The problem statement, all variables and given/known data

*************** a graph has been attached as attachment at bottom*************

The objective is to find the torsion shear stress at the cross section of the "dark Grey tube".

Let's have a look:

1.There is a reaction torque acting on the motor M,

2.The force is then transfered to dark grey tube by a light grey carrier.

3. blue cross is the center of the motor

4. purple cross is the centroid of the dark grey tube

5. i have J / Ixx,Iyy of that tube

6. Only the dark grey tube is fixed at 2 ends.

7. carrier is mush shorter than the tube

2. Relevant equations

I think I am finding the suitable eqts. So I miss this section.

Or

You think T/J= shear/R ??

3. The attempt at a solution

So,

#1 i would like to ask whether the following steps are correct

and

#2 What is the torsion equations for irregular hollow section.

#3 how to find the R, outer radius of the shaft, for the case that equation T/J= shear/R is used.

My Methodology:

1. Shear force is acting at the 2 hand sides of the tube as resultant.

2. the Shear force acts like a torque on the hollow section

3. use parallel axis theorem to transform "moment of inertia" from the original centroid to the torque center

4. use a torsion equation that contain J to fix it (<------------#2 that's what i would like to find now)

Thank you very much for your help.

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# Homework Help: Mechanics: Eccentric torsion + non circular tube

Can you offer guidance or do you also need help?

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