Shaft/Axle Degrees: Help Finding Solution

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Discussion Overview

The discussion revolves around calculating the degrees of twisting in a shaft from point C to D, focusing on the application of torsion and bending stress calculations. Participants are seeking assistance with a specific engineering task related to shaft mechanics.

Discussion Character

  • Homework-related
  • Technical explanation

Main Points Raised

  • One participant expresses difficulty in determining the degree of twist in the shaft and mentions previous calculations related to bending and shear stress.
  • Another participant requests a diagram of the shaft setup to better understand the problem.
  • A participant provides additional context by mentioning the elastic modulus and the specific task requirements, indicating a discrepancy between their calculated result and the expected answer.
  • A reference link is shared that may assist in understanding torsional deflection of shafts.
  • A formula for calculating the angle of twist, θ = T*L/(J*G), is presented, suggesting it might be relevant to the discussion.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the correct approach or solution to the problem, and multiple perspectives on the calculations and methods remain present.

Contextual Notes

There are limitations regarding the clarity of the problem due to the language of the description and the potential need for additional information, such as the diagram of the shaft and its constraints.

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)?
 

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