S-N diagram for ferrous materials

Q.  In S-N diagram, the graph plotted between fatigue strength and number of stress cycles becomes horizontal for which type of materials?  
- Published on 14 Sep 15

a. Ferrous materials
b. Non-ferrous materials
c. Both a. and b.
d. None of the above

ANSWER: Ferrous materials

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    Discussion

  • Sravanthi   -Posted on 03 Nov 15
    - The highest stress which a material withstands without breaking is called as fatigue strength.

    - In S-N diagram, the graph plotted between fatigue strength and number of stress cycles becomes horizontal for ferrous materials.

    - The graph becomes horizontal at 106 cycles. This indicates that fatigue failure occurs beyond 106 cycles.

    - The graph never becomes horizontal for non-ferrous materials and so these have no endurance limit.

    - Endurance limit: The maximum value of completely reversed stress which a standard test specimen can withstand for infinite cycles is called as endurance limit.

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