• HootinNHollerin@lemmy.worldOP
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      4 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.

      • RuBisCO@slrpnk.net
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        4 months ago

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

        • Dettweiler@lemmy.world
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          4 months ago

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

        • HootinNHollerin@lemmy.worldOP
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          4 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.

          • LeftRedditOnJul1@lemmy.world
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            4 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

    • Dettweiler@lemmy.world
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      4 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).