In some materials, the stress at which the material changes from elastic to plastic behavior is not easily detected.
In this case, the offset yield strength is determined. A line is constructed parallel to the initial portion of the stress-strain curve but offset by 0.002 in/in (0.2%) from the origin.
The 0.2% offset yield strength is the stress at which the constructed line intersects the stress-strain curve as shown:
Regards
Ramin Kondori 
QC/Welding Engineer
IWE AT 0070
On Tue, Aug 2, 2011 at 6:29 PM, prashant pansare <prashantpan_99@yahoo.co.in> wrote:
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Dear All,
In some of the materials we need to go for 0.2% offset method for Y.S. Why?
& 0.2% of which value is to be calculated?
Thanx & Regds,
PSP
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