Problem $7(5$ points$)$

Below is Fatigue data for multiple different materials with $($ N $)$ and without $($UN$)$ a rounded profile but the same cross section.

For the IM and SLSz Alloy Determine the multiple applied to the UN fatigue life to get to the N Fatigue life at $30$ MPa $(2$ points each$).$

Indicate a fatigue limit on the chart above $(1$ point$).$