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

[gikiian]

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!

 

[SteamKing]

Remember Hooke's law. What comes first, elastic or plastic action, when stretching a specimen?

 

[gikiian]

The elastic region comes first. But can you differentiate between the two in the figure?

 

[AlephZero]

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!