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Thread: "Unbreakable" glass nearly as hard as steel?

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    "Unbreakable" glass nearly as hard as steel?

    Japanese researchers claim they have developed such a thing. I'm curious if this could be mass produced at a reasonably low cost. Any of you more engineering-inclined types care to weigh in?

    http://ajw.asahi.com/article/sci_tec...AJ201510290034
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    You mean like transparent aluminum?
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    Quote Originally Posted by KingsGambit View Post
    Japanese researchers claim they have developed such a thing. I'm curious if this could be mass produced at a reasonably low cost. Any of you more engineering-inclined types care to weigh in?

    http://ajw.asahi.com/article/sci_tec...AJ201510290034
    The article doesn't say anything about how "unbreakable" the glass might be. Could be it is, but there's nothing to go on here.

    The Young's modulus of the new glass, an indicator of rigidity, was twice as high than typical oxide glass and almost at the same level as steel and iron, according to the scientists.

    Young's modulus measures how much pressure (stress) it takes to stretch (strain) a material. It measures how easy it is to deform an object inside its recovery zone (elastic region). When you stretch a material beyond its recovery zone, it won't bounce back. Stretch it even further, and it breaks.

    Young's modulus is the slope of the stress/strain curve inside its elastic region:

    Stress-Strain.gif

    Young's modulus doesn't apply outside the elastic region.

    The above curve is generic, and doesn't really apply to glass. Glass has a famously small elastic region and doesn't yield. Instead it fails immediately once it leaves that region. That's because glass is not actually a solid, but rather a super-cooled liquid. Add energy and it crystallizes — cracks and breaks.

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    Saw this the other day too. I know it's an older article, but I thought it was pretty cool:

    http://phys.org/news/2009-07-materia...sts-abuzz.html


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    Thanks there is no lao tzu.

    It is hard to tell how this glass could be used.

    Cement is good under compression --where it is well supported beneath it. So you can't just make long narrow beams only using cement and expect to hold a lot, if these are used horizontally.

    Iron beams can be used horizontally or vertically in a structure. They will bend decently enough. It is this bending that helps make iron effective for building. So skyscrapers can sway in the wind without breaking apart.

    I was curious now whether this new type of glass still is describable as "a super-cooled liquid." Such liquid form wouldn't be good for structural purposes but might be good at the local marine aquarium.

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    Not to be pedantic, but glass is already harder than steel.

    It's also much more brittle than steel, that's the problem.
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    Quote Originally Posted by Wally View Post
    Not to be pedantic, but glass is already harder than steel.

    It's also much more brittle than steel, that's the problem.
    Nephrite jade has a lower hardness than glass, but it is tougher and less brittle than glass. It is probably the toughest natural stone. It is a Calcium/Magnesium-Iron Silicate with a structure that resembles steel. I call it the Neolithic steel.

    Sometimes hardness is confused with toughness and brittleness. Diamond has a hardness of 10, but it is brittle like glass.
    Last edited by shunyadragon; 11-03-2015 at 11:16 AM.
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    Quote Originally Posted by lao tzu View Post
    That's because glass is not actually a solid, but rather a super-cooled liquid. Add energy and it crystallizes — cracks and breaks.
    Glass is not a super cooled liquid. It is better described as an amorphous solid.
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