Forces on a Pulley Shaft: Calculating Shear Forces and Power Requirements

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joe888
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Hi i need help calculating the shear forces on a pulley shaft. The pulley of the shaft drives another pulley conected to an alternator. the driver pulley is 160mm in diameter, the driven pulley on the alternator is 140mm. The distance between the pulleys is 664mm and the belt length is 1800mm. The speed of the driven pulley is 1200 RPM and the driver is 1050 RPM. The power to the alternator is 7 KW. Any help with where to begin would be appreciated thanks.
 
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joe888 said:
Hi i need help calculating the shear forces on a pulley shaft. The pulley of the shaft drives another pulley conected to an alternator. the driver pulley is 160mm in diameter, the driven pulley on the alternator is 140mm. The distance between the pulleys is 664mm and the belt length is 1800mm. The speed of the driven pulley is 1200 RPM and the driver is 1050 RPM. The power to the alternator is 7 KW. Any help with where to begin would be appreciated thanks.

With the power to the alternator and the velocity (angular) of the driven shaft, what is the torque on the shaft?

How does torque relate to shear stress? (Hint: think about torsion theory)