Modified Goodman diagram for fluctuating torsional shear stress

Q.  According to Modified Goodman Diagram for fluctuating torsional shear stress, which line defines fatigue failure?
- Published on 14 Sep 15
Modified-Goodman-Diagram-1.png


a. Line joining point Sys on mean stress and stress amplitude
b. Horizontal line QR at point Ses on stress amplitude
c. Polyline STRQ defines fatigue failure
d. None of the above

ANSWER: Horizontal line QR at point Ses on stress amplitude

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    Discussion

  • Sravanthi   -Posted on 03 Nov 15
    - Goodman diagram is modified to account yielding failure of the components. This diagram is used in the design of components which are subjected to fluctuating stress.

    - Horizontal line QR at point Ses on stress amplitude defines fatigue failure. The equation for fatigue failure line QR is as follows:

    Sas / Ses =1

    here, Sas = Limiting safe shear stress amplitude, Ses = Endurance limit of component in shear.

    - The value of θ ≥ θL

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