Question about Hall Petch equation

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SUMMARY

The Hall-Petch equation describes the relationship between grain size and yield strength in materials, specifically highlighting the constants k and σ₀. These constants are intrinsic to the material and must be determined experimentally. The equation indicates that as grain size decreases, the yield strength increases, which is crucial for material selection in engineering applications. Understanding these parameters is essential for predicting material behavior under stress.

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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 I am in a hurry!

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

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