Microstructural Parameters in the Theory of Critical Distances
|Periodical||Materials Science Forum (Volumes 567 - 568)|
|Main Theme||Materials Structure & Micromechanics of Fracture V|
|Edited by||Pavel Šandera|
|Citation||David Taylor, 2007, Materials Science Forum, 567-568, 23|
|Online since||December 2007|
|Keywords||Critical Distance, Damage Zone, Fracture, Grain Size, Microstructure|
The work described below investigates, for the first time, the link between microstructural parameters such as grain size and the length constant L which is known as the critical distance. L is frequently used in the prediction of failure processes such as brittle fracture and fatigue, initiated at stress concentration features such as notches. Values of L were calculated using data from the literature on the effect of short cracks and notches in steels and ceramics. In some cases, simple relationships could be established between L and the grain size, or other microstructural features. Sometimes L was found to be much larger than anything in the microstructure and appeared to be related to the size of the damage zone at failure.