this post was submitted on 24 Jun 2024
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Past the elastic deformation region / yield stress you get plastic deformation, which even when the stress is completely removed there is permanent deformation.
Gotcha. Thanks! Do the points P, E, Y, U, and F stand for something or are the letters arbitrary?
Plastic deformation point, elastic deformation point, yield point, ultimate strength, and failure point
And here I was thinking it was: F U, yep.
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.
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
Proportional limit. Deformation is linear up until this point.
Looks like the plastic deformation point was placed before the elastic point.