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I am somewhat confused about '0.2% offset method' in yield strength test. Does it refer to Rp, or Rr? and in which book or standard could i find the defination for this Please help.
ASTM E8
the 0.2% is just a low value taken for uniformity (there were instances of 0.5% and 0.1% too)
http://www.keytometals.com/Article107.htm