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Homework Help: Difference between Yield stress and Proportional Limit

  1. Oct 31, 2008 #1
    Is there a difference, when looking at the stress-strain diagram, between the "Proportional Limit stress" and the "Yield Stress" ?

    Thanks!!
     
  2. jcsd
  3. Oct 31, 2008 #2

    dlgoff

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    I picked up my old "Introduction to mechanics of solids" text by Egor P. Popov and it states the following:
    Hope this helps a little.
     
  4. Nov 1, 2008 #3
    So, looking at this stress-strain curve, would you say that the proportional limit and the upper yield are in distinguishable?

    Picture3-7.png
     
  5. Nov 1, 2008 #4

    dlgoff

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    I would say yes but the porportional limit is somewhat vaguely defined.
     
  6. Nov 1, 2008 #5
    That's because I defined it. I have no way of telling exactly where the non-linear curve begins... so I just "eyeballed'" it.
     
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