Numerical - Fatigue stress concentration factor, given notch sensitivity

Q.  Calculate fatigue stress concentration factor, when theoretical stress concentration factor is 1.62 and notch sensitivity is equal to 0.9
- Published on 14 Sep 15

a. 1.558
b. 3.358
c. 1.162
d. None of the above

ANSWER: 1.558

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    Discussion

  • Sravanthi   -Posted on 03 Nov 15
    Notch sensitivity: The degree upto which theoretical effect of stress concentration is actually reached is called as notch sensitivity. It indicates sensitivity of the material.

    Notch sensitivity = ( Kf – 1 ) / ( Kt – 1 )

    Given: Notch sensitivity (q) = 0.9, theoretical stress concentration (Kt) = 1.62


    Therefore, Kf = q (Kt – 1) + 1

    Kf = q (Kt – 1) + 1

    = 0.9 (1.62 – 1) + 1

    = 1.558

    Fatigue stress concentration factor = 1.558

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