EPS Aluminum Skin Sandwich Panel
EPS Aluminum Skin Sandwich Panel
(OP)
I am reviewing some composite theory to better understand sandwich panels so that I may compare tested results to theoretical results. I am having diffuclty obtaining the relative density of EPS. Also, in exploring the limit states of panel stiffness, face yielding, face wrinlking, core shear, core fracture, and bond failure. I am finding that the core shear values tend to control the capacity of simply supported panels. The skins are made of Fy = 33ksi 26 gage steel, 4" or 6" thick panels. I applied safety factors related to material strength per AISC specification for steel and safety factors for bond and shear stress per ICC AC4 for Sandwich Panels. I am using the panels in a building application. There is not much literature out there, so I was looking for some more background information, I believe there is a book by H. Allen out there, but I am unable to locate a copy.





RE: EPS Aluminum Skin Sandwich Panel
Density of EPS 25–200 kg/m3
http://en.wikipedia.org/wiki/Polystyrene
Chris DeArmitt PhD FRSC CChem
www.phantomplastics.com
Consultant to the plastics industry
RE: EPS Aluminum Skin Sandwich Panel
If you want a reference but don't want to buy a book try for MIL-HDBK-23 or the Hexcel and Diab design guides.
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RE: EPS Aluminum Skin Sandwich Panel
Quite a few of these are available on Scribd.
Or - for EPS we use
2 pcf, Comp Strength 35psi, Comp Mod 500 psi, Shear Str 33 psi Shear Modulus 625 psi.
You can probably adjust up or down about 50% on the density and change the properties the same amount...good luck finding hi density EPS. As well, Dow has a wide variety and publish a lot of the mech values.
Once you get over about 5/8" the skins rule the equations in the shear properties. It is great to try to balance them, but it will (guaranteed) become a local point load or impact issue...My experience is that in EPS Foam panels, you chose the thickness to fit insulation or assembly and the skin to match a local loading and visual requirement...once you are over 1" the structure takes care of itself. Besides, Ya gotta test it anyway.
Good Luck.
RE: EPS Aluminum Skin Sandwich Panel
RE: EPS Aluminum Skin Sandwich Panel