On TV I've recently seen aluminum isogrid for the SLS fuel tank (Horizon 2014). In the mid-eighties I worked on the Ariane V H10 interstage (the H10 interstage was canceled after the Challenger disaster in 1986 caused cancelation of the Hermes spaceplane (this is according to my memory and may be wrong)). This interstage was carbon-epoxy/Al honeycomb. Does anyone know the reasoning behind the selection of these materials? (The interstage held no fuel but had significant thermal loading, mainly radiation from the tops of the solids, as well as the main design driver of varying compression, also peaking at the position of the solids.) Why are these recent structures ally?
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