Hall Petch Equation

  • #1
What is the Hall Petch equation. When I Google (images) I get::

σy = σo + ky / √d

or

σy = σo + ky d1/2

In the first ky is divided by √d and in the second multiplied by √d.

The second equation is in a study book I have.

Am I making a math error? Thanks.
 
Last edited:

Answers and Replies

  • #2
Ssnow
Gold Member
563
173
I saw from different references that is ##\sigma_{y}= \sigma_{0}+k_{y}d^{-\frac{1}{2}}##
 
  • #3
I saw from different references that is ##\sigma_{y}= \sigma_{0}+k_{y}d^{-\frac{1}{2}}##

Yes, the minus sign should be there. :-)
 

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