MIT2_72s09_lec03

MIT2_72s09_lec03 - MIT OpenCourseWare http:/ocw.mit.edu...

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MIT OpenCourseWare http://ocw.mit.edu 2.72 Elements of Mechanical Design Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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2.72 Elements of Mechanical Design Lecture 03: Shafts
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chedule and reading assignment Reading quiz Hand forward lathe exercise quiz Topics ± Finish matrices, errors ± Shaft displacements ± Stiffness exercise Reading assignment ± Shigley/Mischke Sections 6.1–6.4: 10ish pages & Sections 6.7–6.12: 21ish pages Pay special attention to example 6.12 (modified Goodman portion) © Martin Culpepper, All rights reserved 2
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Deflection within springs and shafts
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hafts, axles and rails © Martin Culpepper, All rights reserved Shafts ± Rotating, supported by bearings/bushings ± Dynamic/fluctuating analysis Axles ± Non-rotating, supported by bearings/bushings ± Static analysis Rails ± Non-rotating, supports bearings/bushings ± Static analysis 4
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xamples drawn from your lathe © Martin Culpepper, All rights reserved 5
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xamples drawn from your lathe © Martin Culpepper, All rights reserved 6
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n practice, we are concerned with © Martin Culpepper, All rights reserved Deflection ± Stiffness ± Bearings and stiffness of connectivity points ± Function of global shaft geometry, sometimes adjacent components Stress ± Catastrophic failure: Ductile Brittle Fatigue ± Function of local shaft geometry 7
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hat is of concern? © Martin Culpepper, All rights reserved Deflection and stiffness ± Beam bending models ± Superposition Load and stress analysis ± Bending, shear & principle stresses ± Endurance limit ± Fatigue strength ± Endurance modifiers ± Stress concentration ± Fluctuating stresses Failure theories ± Von Mises stress ± Maximum shear stress 8
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MIT2_72s09_lec03 - MIT OpenCourseWare http:/ocw.mit.edu...

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