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Home > Forums > Industrial / Manufacturing Engineers > Activities > QC, Inspection & Testing engineering Forum

Normalization of Subsize Charpy resultsHelpful Member!(2) 

thread286-321099
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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?   
Helpful Member!(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 0.8
27 J = 34 J/cm^2
Charpy-U: value in J/cm**2 = value in J divided  by 0.5
These 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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