Von Mises Stress analysis of Leg Joiner of the LOW Leg
From COSMOS FEA analysis of the leg assembly, the minimum Factor of safety is 1.5.  To verify the accuracy of this analysis, the manual method for calculating the max stess is performed.
Titanium Material Properties

Forces on member

Impact  2 due to the assumption the crush pads will absorb 90% of the impact force.

The lander is a four leg configuration so:

Since there are two pins, the force is
divided between each.

As a simplified assumption, the force
acting on the pin is in the middle of it.

From "Fundimentals of Machine Desigh" Stress concentration factors

From Fig. 4.35

Since Kt is approximatly 1 stess concentration is an insiginificant factor.

For Srear Stress

Von Mises Stress Analysis

The small difference in the factor of safety is most likely due to the assumption that the force is applied directly to the center of the pin.