Find the maximum permissible torque for a shaft of known dimensions

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This mechanics of materials tutorial goes over how to find the maximum permissible torque for a shaft of know dimensions.

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Perfect! Exactly what I needed and very well explained. Thank you!

LocPH.

Isn't the equation for polar moment of inertia for this problem should be J = pi/4 * (Ro^4-Ri^4) ?

AnthonyLorenzo-duzb

Just watched your vid on c++ spaces and tabs! Can you make an update version maybe? Btw great vid

lm-dev

Thanks for the explanation. What surprised me that the length of the rod doesn't have any effect for this one. But now when I think about it more, it makes sense. The length only changes how much twist can be in the rod before it brakes. Thank you for opening my eyes :D

TheTugge

why did he do 'to the power of 4' for J?

wizardhunts

Sorry for the late comment, where does one find the allowable shear stress?

danerobinson

Are you sure you want to use the inner radius to earn the Maximum Torque out of this?

Because when we rearrange the equation for Torque it'll be: T = ( Shear stress * I polar ) / ( distance from center ) while we have already fixed values for each of: Shear stress = 85 Mpa & I polar = 1021017.612 mm^4 . And what we have left is the value of: Distance from the center, and since it is in the denominator we need to decrease it's value as much as possible so the Torque's value rise to it's Max.. .

and in order to do that is to choose the inner radius of the shaft ( 20 mm ) to obtain our MAXIMUM Torque.. am i right ?

محمدالعجيري-رم

Find the maximum permissible torque for a shaft of known dimensions

Find the maximum permissible torque for a shaft of known dimensions

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