|Quoting Faro (Thread starter):|
I may be wrong but from what I recall, metals have greater resistance to compressive than to bending or tensile loads. Conceivably, if an arched cabin floor were to involve mainly compressive loads (or a greater proportion of compressive loads), one could make it lighter for a given floor load than a normal, level floor.
|Quoting Phollingsworth (Reply 1):|
Actually they do better with tensile loads. The ultimate tensile stress for most metals is significantly above the compressive yield stress (in most cases the tensile yield stress is also greater). Add to that the fact that when dealing with compresive loads you often get a buckling or crippling failure are stress levels below yield, you want to avoid tom much compression. Remember the upper spar or skin is usually the first part of the wing to fail.
|Quoting Tdscanuck (Reply 3):|
It's true in general, but CFRP lets you tailor the properties along different axes, and also has the yield stress much closer to the ultimate stress, so it tends to perform better.
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