Question
Download Solution PDFThe notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Notch sensitivity:
Notch sensitivity is defined as the susceptibility of a material to succumb to the damaging effect of stress raising notches in fatigue loading
actual stress = Kf σo, theoretical stress = Kt σo
where, σo = nominal stress, Kf = actual stress concentration factor Kt = theoretical stress concentration factor.
Increase of actual stress = (Kf σo - σo)
Increase of theoretical stress = (Kt σo - σo)
Additional Information
Theoretical stress factor (Kt) can also be calculated from the figure if irregularities dimension is given-
where a = Semi-major axis perpendicular to the direction of load and b = semi-minor axis parallel to the direction of load.
For sharp crack:
B → 0 ∴ Kt = ∞
For circle:
A = B
∴ Kt = 3
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