Could somebody cite sources for the table? Granted, most of the materials listed are not exact alloys, but the values are very different from values I have seen in a different source. Hithisishal (talk) 08:20, 27 January 2008 (UTC)
Looks like it is taken from this web page http://www.sv.vt.edu/classes/MSE2094_NoteBook/97ClassProj/exper/mcmurtry/www/matt.html The page specified actual alloys. Belchja (talk) 21:06, 6 June 2008 (UTC)
I have added material previously in the article on Fracture Mechanics. It is more appropriate here.
- I have added links to Charpy and Izod tests but maybe a new subsection on this would be better - then delete the original pages?
It is useful to include the units written as Nm-3/2 - which are the same. The suffix "1" does indeed refer to mode one crack opening but the "C" denotes the critical value showing that, for crack propagation, the stress intensity factor [Y(Pi.a)1/2] must become equal to the Fracture Toughness (EG)1/2
Operational meaning is missing
Suppose I have a sheet of material of known fracture toughness. The dimensions of the sheet are known. Presumably I can predict now how much load the sheet can bear before it cracks, and how thick the sheet should be to allow it to bear a given load. But the article gives no relationship between KIc and the force at which fracture occurs. (This should be related to the question for an accurate test above, but is more general.) --Lambiam 04:07, 5 August 2010 (UTC)
The force or stress at which fracture occurs in your example depends on the flaw size in the material. In a perfectly ideal situation the stress at fracture is simply the bond strength of the material. If you notch the sample the fracture stress changes dramatically. This is what fracture toughness is about, the simple relationship you describe doesn't exist. — Preceding unsigned comment added by Ezrado (talk • contribs) 13:25, 24 September 2014 (UTC)