Equations for Soderberg Criteria

Q.  Which of the following equations is correct for Soderberg Criteria?
- Published on 14 Sep 15

a. (σm / Sut) + (σa / Se) = (1 / Nf)
b. (σm / Sut) - (σa / Se) = (1 / Nf)
c. (σm / Syt) + (σa / Se) = (1 / Nf)
d. (σm / Sut) - (σa / Se) = (1 / Nf)

ANSWER: (σm / Syt) + (σa / Se) = (1 / Nf)

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    Discussion

  • Sravanthi   -Posted on 03 Nov 15
    - Soderberg criteria or line is defined as the straight line joining (Se) on stress amplitude axis and (Syt) on mean stress axis.

    - The triangular region below Soderberg line is considered safe for infinite life.

    - (σm / Syt) + (σa / Se) = (1 / Nf) is the equation for Soderberg line.

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