Hollow Shaft Internal Diameter and Its Impact on Maximum Torque Transmission

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The internal diameter of a hollow shaft does not affect the maximum torque that can be transmitted, as torque is applied to the outermost fibers. Hollow shafts are often preferred due to cost-effectiveness and efficiency in material use. While the internal diameter does not change the maximum allowable torque, it influences stress distribution and deformation under torque, which are related to the polar moment of inertia. Understanding these factors is crucial for effective shaft design. Overall, the design choice between solid and hollow shafts balances torque transmission needs with material efficiency.
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Hi there, can someone pls tell me how the internal diameter of a hollow shaft affects the maximum torque that can be transmitted pls.
 
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I don think it does, the torque is applied to the outermost fibers of the shaft, which is why a lot of shafts aren't solid but hollow. It is also cheaper to make.
 
Like it has been mentioned, it does not effect the maximum torque allowable. What it does have an effect on is the stress distribution and the deformation in the shaft created by the torque because they are a function of the polar moment of inertia.
 
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