L11_Transmission Shaft-fall 10

L11_Transmission Shaft-fall 10 - EAS 209-Fall 2010...

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EAS 209-Fall 2010 Instructors: Christine Human 9/17/2010 1 Lecture 11 Lecture 11 Design of Transmission Shafts Stress Concentrations An important use of circular shafts is to transmit power from one device or machine to another. Drive shaft of an automobile Propeller shaft of a ship Today’s Objectives: Design of transmission shafts Stress concentrations in circular shafts We will end by discussing additional statically indeterminate problem(s) Today’s Homework EAS 209-Fall 2010 Instructors: Christine Human 9/17/2010 2 Lecture 11 Design of Transmission Shafts The principal transmission shaft performance specifications are: power and speed As a designer you must select the shaft material and cross-section to meet performance specifications without exceeding the allowable shearing stress. STEP 1 : Determine torque applied to shaft at specified power and speed. From dynamics where P – power T – torque ω – angular velocity (radians/sec) Since f π ω 2 = where f is frequency of rotation in revs/sec or Hz fT P π 2 = ω T P =
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EAS 209-Fall 2010 Instructors: Christine Human
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