ling or axial loads on the shaft. It is desired to have a static factor of safety of 2 based on the ortion Energy theory. Determine the minimum diameter needed for the shaft. Power, P=To Pure torsion, relationship between T and T

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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**Problem Statement:**

A 1020 CD steel shaft (\(S_y=390 \text{ MPa}\)) is used to transmit 20 kW of power at 1200 rpm. There are no bending or axial loads on the shaft. It is desired to have a static factor of safety of 2 based on the Distortion Energy theory. Determine the minimum diameter needed for the shaft.

- Power, \( P = T \omega \)
- Pure torsion, relationship between \( T \) and \( \tau \)
- Torsional stress

**Instructions:**

To solve this problem, calculate using the following steps:

1. **Power and Torque Relationship:** Use the expression \( P = T \omega \) to find the torque \( T \) in the shaft.

2. **Torsional Shear Stress:** Calculate the torsional shear stress (\( \tau \)) using the pure torsion relationship.

3. **Factor of Safety and Diameter:** Apply the static factor of safety to ensure the shaft's diameter is sufficient to handle the stress without failure, using the Distortion Energy theory.

Make sure to review the relevant mechanical properties of steel and the equations involved in calculating torsional stress and factor of safety.
Transcribed Image Text:**Problem Statement:** A 1020 CD steel shaft (\(S_y=390 \text{ MPa}\)) is used to transmit 20 kW of power at 1200 rpm. There are no bending or axial loads on the shaft. It is desired to have a static factor of safety of 2 based on the Distortion Energy theory. Determine the minimum diameter needed for the shaft. - Power, \( P = T \omega \) - Pure torsion, relationship between \( T \) and \( \tau \) - Torsional stress **Instructions:** To solve this problem, calculate using the following steps: 1. **Power and Torque Relationship:** Use the expression \( P = T \omega \) to find the torque \( T \) in the shaft. 2. **Torsional Shear Stress:** Calculate the torsional shear stress (\( \tau \)) using the pure torsion relationship. 3. **Factor of Safety and Diameter:** Apply the static factor of safety to ensure the shaft's diameter is sufficient to handle the stress without failure, using the Distortion Energy theory. Make sure to review the relevant mechanical properties of steel and the equations involved in calculating torsional stress and factor of safety.
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