Which Shaft Transmits More Torque: Hollow or Solid?

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Discussion Overview

The discussion revolves around the comparison of torque transmission capabilities between hollow and solid shafts under two specific conditions: when both shafts have the same diameter and when they have the same cross-sectional area. Participants seek theoretical explanations, calculations, and examples to support their claims.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant poses a question about which type of shaft transmits more torque under two conditions, asking for calculations and theoretical backing.
  • Another participant suggests that the original post appears to be a homework question and inquires about the poster's prior work and class discussions on the topic.
  • A different participant shares that the question was asked during their job interview, indicating a belief that a solid shaft transmits more torque in the first condition, while a hollow shaft does so in the second condition, but seeks clarification on the reasoning behind these conclusions.
  • Another reply discusses the importance of material properties and the second moment of area in determining a shaft's strength in torsion, suggesting that calculations with hypothetical numbers could aid understanding.

Areas of Agreement / Disagreement

Participants express differing views on the torque transmission capabilities of hollow versus solid shafts, with no consensus reached on the reasons behind the differences. The discussion remains unresolved regarding the exact mechanics and calculations involved.

Contextual Notes

Participants reference the need for calculations and theoretical explanations, indicating that assumptions about material properties and cross-sectional areas are critical to the discussion. There is also an acknowledgment of the potential for differing interpretations based on the conditions set forth.

Who May Find This Useful

Individuals interested in mechanical engineering, materials science, or those preparing for technical interviews may find this discussion relevant.

vsp_6887
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I have a two shaft 1) hollow shaft 2) solid shaft . both has same length.

Condition 1) If diameter of both this shaft is same, which shaft can transmit a more torque? how?

condition 2) If cross section area of both this shaft are same then which shaft can transmit more torque? how?

Please reply with calculation & theory & example if possible...
 
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I think it's pretty obvious this is homework so I'll have to do my due diligence: what do you think? Have you done any work? What lectures have you had in class which discussed this?
 
Actually this is a question ask during my 1st interview..

I read earlier this & reply for condition i think 1 ) ans is solid shaft & for condition 2) Hollow shaft

But i do not find clear answer why ? what is the reason...
 
So I guess the interview didn't go well? Have you taken a class in this topic?

The strength of a shaft in torsion is controlled by its material properties, and the cross-sectional torsion constant a.k.a. the second moment of area. You may try calculating the shaft strength for each case using some made up numbers to see what you come up with, I think it could help with your understanding...

http://en.m.wikipedia.org/wiki/Torsion_(mechanics)
 

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