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True Stress-Strain Curve on the Log Scale: Which portion is the plastic region?

  1. Nov 17, 2012 #1
    My math is a little weak, so I'm having a hard time finding the elastic and plastic regions on this curve. Any further help will also be appreciated!

  2. jcsd
  3. Nov 17, 2012 #2


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    Remember Hooke's law. What comes first, elastic or plastic action, when stretching a specimen?
  4. Nov 17, 2012 #3
    The elastic region comes first. But can you differentiate between the two in the figure?
  5. Nov 18, 2012 #4


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    Hooke's law says that in the elastic region, stress is proportional to strain.

    In your graph you have a strainght line on a log log scale (not a linear scale) but the stress and strain are not proportional.

    If your graph is drawn correctly, you can't find the elastic region because it isn't shown on the graph!
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