Question

How is it possible to bend glass? (This question is with reference to the ultra thin glass used in Samsung Galaxy Z Flip)​

Answer 1

Yaaa....Gud Question.

When a device like the Samsung Galaxy Z Flip closes, there's a gap between the two halves of the glass. There are also raised edges around the screen, which prevent both sides of the glass from directly touching each other when it's folded shut.

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Answer 2

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The main gotcha: you can only stretch a material’s chemical bonds so far before it breaks, a concept known as tensile strength. But if you use a thinner sheet of glass, you’re stretching less

of the material across the same space, bending fewer layers and stretching fewer chemical bonds, Mydlak says. That puts less tensile strain on the glass, letting you bend it tighter before it snaps. Thinning out the glass is one of the “two main tricks” to making it bend, says MIT associate professor of materials science Juejun Hu, because physics students learn that tensile strain scales linearly with thickness.

When you get glass down below a hundred microns thick — around the thickness of a human hair — that’s when it can bend far enough for basic folding gadgets, experts say. If you want a phone that folds inward without a huge hinge gap, we’re talking tens of microns. Think aluminum foil.

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