Slightly OT but just came to me. Were any ships ever built with hollow armour plating, i.e. 1 inch plate/ 1 inch hollow/ 1 inch plate, the reason I ask being that a hollow tube is significantly stronger than a solid tube. Is the same true for plate?
If I understand your question, the answer is 'No'. A sheet of armor plate with a hollow center would crumple like a cardboard box when hit.
Italy did design and use what was called the Pugliese torpedo defense (named for the designer). A large tube of rolled armor ran the length of the ship's side inside the hull. The idea was that an exploding torpedo would use its energy crushing the tube - like hitting a beer can with a hammer - and prevent the ship from taking structural damage. In theory, it worked, and in practice it would have worked except for one little point: torpedo warheads got more powerful. The unexpected side-effect was that with a more powerful warhead the crushing actually got much, much worse and the damage was greater than if there had been no tube at all.
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