Shear force in a frame due to torsion?

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Discussion Overview

The discussion revolves around calculating the material strength required to prevent shear failure in a frame subjected to torsion from a gear driven by a motor. The context includes considerations of applied torque and additional loads acting on the frame.

Discussion Character

  • Technical explanation, Homework-related

Main Points Raised

  • One participant expresses uncertainty about calculating the material strength needed to prevent shear failure in the frame due to applied torque.
  • Another participant suggests that the shear stress at each plate connection can be derived from standard equations for torque applied to a shaft, indicating that the induced shear stress should be half of the calculated shear stress from the torque.
  • There is a clarification that the inquiry is related to a project rather than a homework problem.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the specific calculations or methods to be used, and the discussion includes varying levels of understanding regarding the application of shear stress equations.

Contextual Notes

The discussion does not specify the exact dimensions of the shaft or frame, nor does it clarify the nature of the load in the z direction, which may impact the calculations.

boganaut
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joint1.jpg

The orange thing is a gear being turned by a motor, which is intended to move the frame the shaft is fixed to. I realize the applied torque is going to create support reactions, but I can't quite figure out how to calculate the needed material strength so that the frame won't shear.

All helps greatly appreciated.

Edit: I should probably add that there's a load attached to the frame in the z direction relative to the bottom right picture.
 
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Is this a homework problem?
 
Chestermiller said:
Is this a homework problem?

No, it's for a project.
 
The torque induced shear stress at each plate connection should be 1/2 of the shear stress from an applied torque calculated for a shaft of your dimensions using standard textbook/online available equations.
 

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