More on core problems
Hold that thought nooby!
Another problem with honeycomb core is that you can not do an adequate surface preparation process on bare core. To get a durable bond to aluminium, you need a chemically active surface which is treated to develop a resistance to hydration. You can not abrade or chemically treat bare aluminium core material, so it is usually just solvent degreased (if anything is done at all!). Hence, the bond is still susceptible to hydration.
The real solution to hydration is for the manufacturer to use phosphoric anodised core which has an epoxy primer applied as part of the core manufacturing process. ALCORE and Hexcell offer these products. In that case the interface between the aluminium and the primer is appropriately managed, and when the part manufacturer bonds to the core, he performs an epoxy-to-epoxy bond on which is far easier to generate hydration resistance. The studies outlined in the reference in the previous message found that PAA and primed core was considerably less susceptible to adhesion fillet bond failure between the adhesive and core.
So, the question is "Did Augusta use PAA and primed core?" If not, they simply delay the onset of the same problem.
Regards
Blakmax
PS don't you ever sleep?