Shouldn't in theory....but generally does. Try bending a piece of tubing 90deg or 190deg, you'll certainly see that while material outside of the neutral axis stretches somewhat, the material to the inside of it does not compress. Way back in the day 9early '80's) when I was pursuing a welding career, we'd have to bend 3/8" or 1/2" plate 180deg to test the welds, and there was a definate angle to the ends. It depends a lot on the material, and how it's clamped when bending. If it's clamped tightly, the ends are perp to the neutral axis, but the bend thins out. Also, say, in sheetmetal, the actual bend is tight, and very localized. This looks like they roll a plate.
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