One never knows for sure; but I think not likely that this applies.  This is for discs constrained at the center, as on a spindle, where the outer edge is free. 

Clarifying – that comment was directed toward that modeling not being applicable; but that doesn’t mean that a vibration induced axial loading is not a possibility. I was thinking in terms of the plate/disk in which the rivets are located, but that is attached to the starter ring gear disc, which is flexible as well; and there could be some “ringing” going on. The rivets are certainly weak in the axial direction. Using bolts that are very strong both axially and in shear, and provide strong clamping force between the parts does seem like a better solution.

So when we make that stronger – do we drive the issue to some other point?  OK, I won’t even go there.

Al