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{{Language_sel|LANG=ger|ARTIKEL=Risswiderstandskurve – Experimentelle Methoden}}
{{PSM_Infobox}}
Crack resistance curve – Experimental methods
__FORCETOC__

==Crack resistance curve – Experimental methods==

For the experimental recording of [[Crack Resistance (R) Curve|crack resistance (R) curves]] under dynamic [[Impact Loading Plastics|(impact) loading]], e.g. in the [[Instrumented Charpy Impact Test|Instrumented Charpy impact test]] (ICIT), four different possibilities are known in principle from the literature:

# [[ICIT – Energy Method|ICIT energy method]] (ICIT low-blow technique)
# [[ICIT – Support Span Method|ICIT support span method]]
# [[ICIT – Specimen Length Method|ICIT specimen length method]]
# [[ICIT – Stop Block Method|ICIT stop block method]]

The objective of all experimental methods is to vary the stable crack growth Δ''a'' (distance between original crack size and crack front after loading) as a basis for determining the [[Fracture Mechanical Testing|fracture mechanics parameters]] of [[Crack Initiation|crack initiation]] and [[Crack Propagation|propagation]] using the [[Crack Resistance (R) Curve|R-concept]].

The algorithm for recording R-curves in the [[Instrumented Charpy Impact Test|instrumented notched impact test]] (ICIT), for example, is comparable for all the methods listed above [1 – 4]:

* Generation of stable crack initiations (multi-specimen technique / single-specimen technique) (stop-block, low-blow, energy method ...)
* Recording of [[ICIT – Types of Impact Load–Deflection Diagrams|load (''F'')–deflection (''f'') diagrams]]
* Generation of cryogenic fractures (brittle fracture surfaces)
* Determination of the amount of stable crack growth (light microscopic)
* Determination of load parameters from the ''F''–''f'' diagrams (in case of determination of J-values including the amount of stable crack growth)
* Graphical representation of the R-curves
* Evaluation of the R-curve (validity check, curve fitting ...)
* Determination of [[Material Value | Material value]]s (physical or technical crack initiation values ''J''i; ''δ''i; ''J''0.2; ''δ''0.2 and ''JT''J; ''δT''δ;''T''J; ''T''δ)

==See also==

*[[Fracture Mechanics|Fracture mechanics]]
*[[Crack Resistance (R) Curve|Crack resistance (R) curve]]
*[[Crack Resistance Curve – Examples|Crack resistance curve – examples]]
*[[Crack Resistance Curve – Elastomers Quasistatic|Crack resistance curve – elastomers quasistatic]]
*[[Bend Test and Light Microscopy|Bend test and light microscopy]]
*[[Stretch Zone|Stretch zone]]

'''References'''

{|
|-valign="top"
|[1]
|[[Grellmann, Wolfgang|Grellmann, W.]], [[Seidler, Sabine|Seidler, S.]] (Eds.): Mechanical and Thermomechanical Properties of Polymers. Landolt-Börnstein, Volume VIII/6A3, Springer Berlin (2014) (ISBN 978-3-642-55165-9; siehe AMK-Library under A 16)
|-valign="top"
|[2]
|[https://www.researchgate.net/profile/Wolfgang-Grellmann Grellmann, W.], [https://de.wikipedia.org/wiki/Sabine_Seidler Seidler, S.] (Eds.): Deformation and Fracture Behaviour of Polymers. Springer Berlin Heidelberg 2001, 626 Pages, 447 Illustrations and 51 Tables, ISBN 3-540-41247-6, ISBN 978-3-450-41247-2; see AMK-Library under A 7) https://link.springer.com/book/10.1007/978-3-319-41879-7
|-valign="top"
|[3]
|Seidler, S.: Anwendung des Risswiderstandskonzeptes zur Ermittlung strukturbezogener bruchmechanischer Werkstoffkenngrößen bei dynamischer Beanspruchung. VDI-Verlag Düsseldorf, 1998, ISBN 3-318-323118-2; see AMK-Library under B 2-1
|-valign="top"
|[4]
|[https://de.wikipedia.org/wiki/Wolfgang_Grellmann Grellmann, W.], Seidler, S.: Risszähigkeit von Kunststoff-Messungen bei dynamischer Beanspruchung. Materialprüfung 33 (1991) 7-8, pp. 213−218
|}

[[Category:Fracture Mechanics]]
[[Category:Instrumented Impact Test]]

Crack Resistance Curve – Experimental Methods - Revision history