this post was submitted on 24 Jun 2024
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Science Memes

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No going back (lemmy.world)
submitted 4 months ago by [email protected] to c/[email protected]
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[–] [email protected] 35 points 4 months ago (2 children)

Can a TI-84slinger explain this for us pipette-wielders?

[–] [email protected] 52 points 4 months ago (2 children)

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

[–] [email protected] 16 points 4 months ago (2 children)

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

[–] [email protected] 36 points 4 months ago (2 children)

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

[–] [email protected] 6 points 4 months ago

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

[–] [email protected] 10 points 4 months ago (2 children)

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.

[–] [email protected] 21 points 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

[–] [email protected] 11 points 4 months ago

Proportional limit. Deformation is linear up until this point.

[–] [email protected] 4 points 4 months ago

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

[–] [email protected] 25 points 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).