Talk:Fracture toughness

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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)

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