Shaft/Axle Degrees: Help Finding Solution

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Omg999
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Hi!
I need help with a task. I have done previous calculations on the shaft, but I'm stuck now, as I'm going to find out how many degrees the shaft is twisting from point C to D. I have calculated bending/shear stress, torsion stress and the last stress that i don't know in english, but the formula is like this:
upload_2019-3-8_17-53-13.png


So I am wondering if anyone has done this before?
 

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Welcome to the PF. :smile:

Can you post a diagram of the shaft and how it is being held and torqued? Use the UPLOAD button in the lower right of the Edit window to attach a PDF or JPEG file to your reply. Thanks.
 
Thank you! :)

The picture of the shaft with belt transmission is showed in task 6.1 The describtion is in norwegian, as I'm from Norway. I have done task a) b) c) and d). Now, task e) says: How many degrees will the shaft twist between point C and D? Elastic modul is given 81.300 N/mm^2.

Please see the other picture with the equation marked in red: I think that is the correct formula to use, but I can't seem to get a realistic answer.. The answer should me 0,... something but I get 58.8.
 

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Do you know about theta=T*L/(J*G)?