snip...

I'll have to try that. Do you dip them in oil or are they easy to remove
after cure?

The idea with the nylon drywall anchors is they are cheap and light weight
and they can be left in. If they are left in they add to the
strength of the joint as they go down deep in to the foam adding
a lot of bonding area due to their relatively large diameter. They
also provide a mechanical shear connection much like a bolted joint
would. The large diameter is a huge advantage transferring the
shear load to the lower thin skin of the sandwich panel. The
technical term is bearing strength.
              
"Bearing Strength"
"The maximum bearing load at failure divided by the effective bearing area.
In a pinned or riveted joint, the effective area is calculated as
the product of the diameter of the hole and the thickness of
the bearing member."

Do you want to add to this definition Chris Cosman?

http://www.astm.org/Standards/D953.htm

Paul Lamar

Only that my book refers to it as Bearing Stress instead of Strength.  Potato, Patato.  Still the same eq. -  Force/ Area.


Chris Cosman