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# Normalization of Subsize Charpy results(2)

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 brimstoner (Materials) 30 Apr 12 14:04
 I frequently encounter Charpy impact energy reported as J/cm**2.  I assume this is based on the fracture area and not the overall area of the test specimen.  I am attempting to normalize data from '2.5t' specimens to a result for a full size specimen (10 x 10 mm, with 2 mm notch depth, leaving 0.8 cm fracture area).  Again I am guessing '2.5t' indicates a 2.5 mm thick specimen.  Someone please clarify!  Note this is not a question about test temperature compensation (as in ASME VIII-1, UG-84).
 brimstoner (Materials) 30 Apr 12 14:22
 I think what I am actually asking is: how is J(ft-lbf) related to J/cm**2 (ft-lbf/sq.in.) for standard and subsize Charpy specimens?
 (2)  ulyssess (Materials) 1 May 12 8:40
 J/cm**2 is related to the nominal cross section below the notch.Charpy-V: value in J/cm**2 = value in J divided  by 0.827 J = 34 J/cm^2Charpy-U: value in J/cm**2 = value in J divided  by 0.5These relations are valid for all specimen (standard or reduced-size section).The indication in J/cm^2 or ft-lbs/sq.in. is not in conformance with actual standards like ISO 148-1 or ASTM A370.
 brimstoner (Materials) 1 May 12 10:13
 Thanks ulyssess, you've confirmed my suspicion that J/cm**2 is non-standard.  I found no reference to that in ASTM A370 and other documents.

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