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Toughest material

  1. Mar 3, 2009 #1
    "toughest" material

    by terms of "mechanics" (physics, not the ones that work on your car). toughness is shown as the area under the curve of a stress strain diagram. from the we can say that this material offers a high ultimate strength, but also can strain a fair amount before breaking....
    with that definition, what would you say the "toughest" material is?

    also, would carbon-fiber nano tubes be considered brittle or ductile?

    also, can brittle materials be as tough as ductile ones?


    thanks
    jared
     
  2. jcsd
  3. Mar 4, 2009 #2

    Mapes

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    Re: "toughest" material

    I'll nominate steel for toughest material (based on an Ashby chart of toughness).
     
  4. Mar 4, 2009 #3
    Re: "toughest" material

    Toughness is basically the specific amount of energy a material can absorb before it fails.

    I don't think you can classify nano-tubes as either since we can't manufacturer them in a pure lattice form yet.

    And no, brittle materials are usually not as tough as ductile ones.


    I seriously doubt that.

    If I had to guess I would say Kevlar.
     
  5. Mar 4, 2009 #4

    Mapes

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    Re: "toughest" material

    Why guess? TRIP steels have a KIC exceeding 200 MPa-m1/2. Which Kevlar composite exceeds this?
     
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