Machine Design slide 10

Machine Design slide 10 - Machine Design Week 6 Lecture 1...

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Click to edit Master subtitle style 4/17/11 Machine Design Week 6 Lecture 1 UOIT, 2011 winter
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4/17/11 Fluctuating Stresses σmin: minimum stress, σmax: maximum stress, σa: amplitude component, σr: range of stress, σs : static or steady stress, σ m: midrange component
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4/17/11 Fluctuating Stresses Midrange and amplitude component of the force are given by: Midrange and amplitude component of the stress are given by: In absence of a notch, σa and σm are equal the nominal stresses σao and σmo induced by Fa and Fm, respectively; in the presence of a notch, the fatigue stress concentration factor Kf should be applied to both components.
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4/17/11 Example 1 A 1.5-in-diameter bar has been machined from an ANSI 1050 cold-draw bar. This part is to withstand a fluctuating tensile load varying from 0 to 16kip. Because of the ends, and fillet radius, a fatigue stress concentration factor Kf is 1.85 for 106 or larger life. Find Sa and Sm and the
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Machine Design slide 10 - Machine Design Week 6 Lecture 1...

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