Foam core sandwich failures in edgewise (end on) compression?

[Nick Lockard]

thread327-426759

Read a few thesis, but can't find anything related to my question:

QUESTION: what is the end-on strength of the outer, vertical walls & resistance to buckling of the following sandwich assembly?

Application is: I'm building a trailer module and want to bond 1.375" sandwich panels into assembled structure:

Details of panels:
2.5 lb EPS core,1.327" thick (33.7mm) , 0.024" (.61mm) (3003-Aluminum facings, 3M #78 or better pressure activated adhesive (plus pre-perforation preparatory step on foam)
Vacuum bag cured @ 15psi for 48 hours + roller pressure
Edge faces protected from weather, abrasion, and damage by envelopment only through assembly method:

Details of assembly method:
Butted corner unions with unprotected face downward
Encapsulation on either side with 6061-Aluminum (0.062" thick, 2" outer, 3/4" inner) joined by countersunk Stainless Steel Binding Barrels
In between 3003-aluminum skin and angle aluminum, 1mm thick 3m VHB tape or better, activated by tightening the binding barrels permanently.
Binding barrels locked with dab of threadlock

Further notes:
Wettable areas or water intrusion seams protected by butyl tape or silicone caulking, with overlaid fiberglass tape protecting that.

 

[SWComposites]

You need to go run some tests of the panels to determine the strength and stiffness properties.