Machine Design_slide 9

Machine Design_slide 9 - Machine Design Week 5 Lecture 2...

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Machine Design Week 5 Lecture 2 UOIT, 2011 winter
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Endurance Limit = MPa S MPa kpsi S kpsi MPa kpsi S MPa kpsi S S ut ut ut ut e 1400 700 200 100 ) 1400 ( 200 / 50 . 0 ' For steels, the endurance limit can be related to tensile strength:
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Fatigue Strength - = e ut S fS b log 3 1 And exponent b is given by: b f aN S = Where the constant a is given by: e ut S fS a 2 ) ( =
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Fatigue Strength Fraction f
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Endurance Limit Modifying Factors ' e f e d c b a e S k k k k k k S = k a : surface condition modification factor k b : size modification factor k c : loading modification factor k d : temperature modification factor k e : reliability factor k f : miscellaneous-effects modification factor S e ’: test endurance limit S e ’: endurance limit
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Theoretical Stress Concentration It is difficult to design a machine without permitting some changes in the cross sections of members. Any discontinuity in a machine part alters the stress distribution in the neighborhood of the discontinuity so
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Machine Design_slide 9 - Machine Design Week 5 Lecture 2...

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