Question

In general, this of the following methods yields the most conservative fatigue strength proof (a) Saderberg method (b)-Goodman method (c)-Gerber line (d)-The ASME elliptic curve.

Answer 1

Answer:

a). Soderberg method

Explanation:

A straight line joining the endurance limit, $S_{e}$ on the ordinate and to the yield strength,$S_{yt}$  on the abscissa is know as Soderberg line.

   The Soderberg line is the most conservative failure criteria and in this there is no need to consider yielding point in this case.

The equation for Soderberg is given by

$\frac{\sigma _{m}}{S_{yt}}+\frac{\sigma _{a}}{S_{e}}=1$

where $\sigma _{m}$ is mean stress

           $\sigma _{a}$ is amplitude stress