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posted by Fnord666 on Tuesday December 26 2017, @10:23AM   Printer-friendly
from the any-volunteers-for-testing? dept.

Banned for civilian use before it even exists:

https://sciencealert.com/graphene-paired-sheets-diamene-deformation-diamond-property

One day armed forces might protect themselves with layers of a material called diamene; dual layers of graphene that respond to a force by deforming into an impenetrable diamond plate.

[...] Researchers from the Advanced Science Research Centre at the City University of New York [have] layered pairs of graphene sheets to create a material that turns into a three-dimensional diamond-like structure when smashed with enough force.

Sudden changes to the conductivity of the sheets when dented could present some interesting new electronic properties.

But it's the possible application as lightweight protection where it really gets interesting.

"This is the thinnest film with the stiffness and hardness of diamond ever created," says lead researcher, physicist Elisa Riedo.

"Previously, when we tested graphite or a single atomic layer of graphene, we would apply pressure and feel a very soft film. But when the graphite film was exactly two-layers thick, all of a sudden we realised that the material under pressure was becoming extremely hard and as stiff, or stiffer, than bulk diamond."


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  • (Score: 2, Informative) by noneof_theabove on Tuesday December 26 2017, @02:10PM (3 children)

    by noneof_theabove (6189) on Tuesday December 26 2017, @02:10PM (#614286)

    Over the life time of kevlar in law enforcement several officers around the nation have succumbed to being beat to death.
    Most were from automatic weapons [uzi] that cause the heart to stop or rupture blood vessels and then bleed out.

    SCIENCE ALERT - Do Not Read If You Do Not Believe In Science !

    Excluding rifle ammunition above .22 long rifle [they all penetrate kevlar] so this is pistol based.
    [BTW sharp pointed razor arrows also penetrate]

    Trying to stop a 125 grains [8 grams] of metal traveling at 1400 ft/sec with 0" of deflection at impact is a failed attempt at infinity.

    From searching the net:
    A modern soft armor “kevlar vest” (not always kevlar though) is effective at stopping most handgun and shotgun threats.
    Even the thinner, less effective Level II vests will stop most any bullet, although it often comes with excessive blunt force,
    which can break bones and cause serious injury… and also limit one's ability to stay in the fight.

    A 45 ACP was designed to take a say 6' 250lb male charging you and literally knock then back and flat on their back.

    Just some science based searching.

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  • (Score: 1, Informative) by Anonymous Coward on Tuesday December 26 2017, @03:25PM (2 children)

    by Anonymous Coward on Tuesday December 26 2017, @03:25PM (#614316)

    A 45 ACP was designed to take a say 6' 250lb male charging you and literally knock then back and flat on their back.

    Calculate the kinetic energy between any grain-weight of .45ACP bullet (typically 230gr) and the kinetic energy of a "charging" 250lb human being to realize what a foolish statement that is.

    Just some science based searching.

    How come you keep using that word? I do no think it means what you think it means.

    • (Score: 3, Informative) by KilroySmith on Tuesday December 26 2017, @04:22PM (1 child)

      by KilroySmith (2113) on Tuesday December 26 2017, @04:22PM (#614337)

      Calculate the kinetic energy between any grain-weight of .45ACP bullet (typically 230gr) and the kinetic energy of a "charging" 250lb human being to realize what a foolish statement that is.

      Exactly. And I'd add the science-based question: "If a .45 ACP bullet had sufficient energy to knock a charging 6' 250lb male back and flat on their back, what do you suppose has to happen to the shooter?"

      Bad guys getting knocked backwards through store windows only happens in the movies - just like cars that explode.

      • (Score: 2) by Arik on Wednesday December 27 2017, @04:49AM

        by Arik (4543) on Wednesday December 27 2017, @04:49AM (#614612) Journal
        People *do* get 'knocked down' or 'knocked over' but not with anything like the frequency and ferocity people that don't understand the third law as it applies to recoil imagine. A jolt which you can easily handle directed into your hand or shoulder when you expect it can still be a very punishing blow if it catches you unawares or in, say, the sternum. And the weight of the weapon itself moderates the recoil somewhat for the shooter, a benefit the receiver does not receive.

        So you know, if the guy is standing right on the edge of a roof looking down into the street, and you shoot him from behind with a pocket pistol, and he's wearing kevlar, I could see it knocking him off the roof. Or heck if he's just standing there flatfooted real close with his back to the street, and you shoot him from the front, and nail him right in the solar plexus with the shot, I bet that would work.

        Totally overused and exaggerated for Hollywood though, as you say.
        --
        If laughter is the best medicine, who are the best doctors?