Comment on No going back

Rubisco@slrpnk.net ⁨5⁩ ⁨months⁩ ago

• HootinNHollerin@lemmy.world ⁨5⁩ ⁨months⁩ ago

  Past the elastic deformation region / yield stress you get plastic deformation, which even when the stress is completely removed there is permanent deformation.

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  • Rubisco@slrpnk.net ⁨5⁩ ⁨months⁩ ago

    Gotcha. Thanks! Do the points P, E, Y, U, and F stand for something or are the letters arbitrary?

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    • Dettweiler42@lemmy.world ⁨5⁩ ⁨months⁩ ago

      Plastic deformation point, elastic deformation point, yield point, ultimate strength, and failure point

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      • Rubisco@slrpnk.net ⁨5⁩ ⁨months⁩ ago

        Image

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      • Dave@lemmy.nz ⁨5⁩ ⁨months⁩ ago

        And here I was thinking it was: F U, yep.

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    • HootinNHollerin@lemmy.world ⁨5⁩ ⁨months⁩ ago

      E is where it stops being linear, Y is yield, U is ultimate as in max, and f is fracture / failure. Not sure about p.

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      • LeftRedditOnJul1@lemmy.world ⁨5⁩ ⁨months⁩ ago

        P is the Proportional Limit, where it stops being linear, but remains elastic for a short while longer, meaning any deformation can still be recovered. E is the Elastic Limit, where it changes from elastic to plastic

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      • andrewth09@lemmy.world ⁨5⁩ ⁨months⁩ ago

        Proportional limit. Deformation is linear up until this point.

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  • Someonelol@lemmy.dbzer0.com ⁨5⁩ ⁨months⁩ ago

    Looks like the plastic deformation point was placed before the elastic point.

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• Dettweiler42@lemmy.world ⁨5⁩ ⁨months⁩ ago

  Everything past the dotted line is the point where the material won’t go back to its original shape.
  Example: You can push on the hood of your car all you want, it’ll flex, and go back to its original shape (elastic deformation); but stand on it, and it’ll dent (plastic deformation).

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