Shaft/Axle Degrees: Help Finding Solution

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The discussion focuses on calculating the degree of twist in a shaft between points C and D, with the user having already completed several related tasks. They have calculated bending, shear, and torsional stresses but are struggling to find a realistic answer for the twist, which should be a small value. The user provides an elastic modulus of 81,300 N/mm² and references a formula for torsional deflection. They seek assistance in verifying their calculations and understanding the correct application of the formula. The conversation emphasizes the need for clarity in the calculations to achieve accurate results.
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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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