Dr. Ali Al-Gadhib 1)To find the relationship between torque and the amount of power delivered to rotate a shaft. 2)To design a shaft to carry a given power and/or torque.

Dr. Ali Al-Gadhib Power is rate of doing work T = the applied torque (N-m)  = angular velocity (rad/s)  = angle of rotation but not angle of twist  (rad) P = power P = 2  fT f in Hz or (1 cycle/s)

Dr. Ali Al-Gadhib Shaft Design Given: (T or P and  all or  alt ) Find: d of the shaft. Example:

Dr. Ali Al-Gadhib Solution:

Dr. Ali Al-Gadhib Example: Solution:

L P P L T T

A B ++ ++ TT +T+  ++T++T --T--T -T- 

Dr. Ali Al-Gadhib Example:

Solution:

Angle of Twist:

Dr. Ali Al-Gadhib Example:

Internal Torque:

Dr. Ali Al-Gadhib Solution: