Question about Hall Petch equation

[da_coolest]

http://img193.imageshack.us/img193/1825/hallp.png (http://img193.imageshack.us/i/hallp.png/)

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according to the equation what are the two stress related value that should be entered? (the value before the = and the value after = sing?




this is a silly question. but i couldn't find any answer and im in a hurry!

Thanks in advance

[Mapes]

this is a silly question. but i couldn't find any answer and im in a hurry!

Hall-Petch equation (http://en.wikipedia.org/wiki/Grain_boundary_strengthening#Hall-Petch_relationship). It took 0.61 seconds.

[pukb]

k and sigma0 are constant for a material and their values depend purely on the material.