As I mentioned earlier, I know sod all about modern composite structures. I am aware, though, that carbon fibre/epoxy resin structures do not suffer from many of the problems, such as osmosis, found in fibre glass reinforced polyester/acrylic resin ones.
I think many of us accept that a carbon fibre structure that hasn't received permanent strain will allow as good an impact survivability as an aluminium alloy one, if not better. Perhaps I'm being blind or thick (or both!) but I've not seen any explanation of how post "hangar rash" (credit to Capt Peacock), heavy landing, tail scrape/strike events will be investigated and evaluated. Did I miss it?