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{{Language_sel|LANG=ger|ARTIKEL=Rissöffnung}}
{{PSM_Infobox}}
Crack opening
__FORCETOC__

==Definition of crack opening==

The determination at the location of the original [[Crack|crack tip]] has become the standard for defining the crack opening. For numerical calculations, the [[Crack Tip Opening Displacement Concept (CTOD)|CTOD]] value is determined as the intersection of the crack edges with the straight line extending at an angle of 90° from the crack initiation point using the following relationship (see also Fig. 1):

{|
|-
|width="20px"|
|width="500px" | <math>\delta_{90^\circ};\delta_{45^\circ}=\frac{\delta_{90^\circ}}2</math>
|}

The determination of ''δ''a is associated with experimental difficulties and is essentially only used for numerical problems.

[[file:Crack Opening Fig1.jpg|400px]]
{|
|- valign="top"
|width="50px"|'''Fig. 1''':
|width="600px" |Determination of the relevant parameters for crack opening
|}

==See also==

* [[Crack Model according to DUGDALE|Crack model according to DUGDALE]]
* [[Crack Tip Opening Displacement Concept (CTOD)|Crack Tip Opening Displacement concept (CTOD)]]
* [[Fracture Mechanics|Fracture mechanics]]
* [[Plastic Zone|Plastic zone]]
* [[Fracture Process Zone|Fracture process zone]]

'''References'''

* [[Blumenauer, Horst|Blumenauer, H.]], Pusch, G.: Technische Bruchmechanik. Deutscher Verlag für Grundstoffindustrie, Leipzig Stuttgart (1987) p. 70 (ISBN: VLN 152-915/61/62; see [[AMK-Büchersammlung|AMK-Library]] under E 29-2)

[[category:Fracture Mechanics|Fracture mechanics]]

Crack Opening - Revision history