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{{Language_sel|LANG=ger|ARTIKEL=Spröd-Zäh-Übergangstemperatur}}
{{PSM_Infobox}}
<span style="font-size:1.2em;font-weight:bold;">Brittle-tough transition temperature</span>
__FORCETOC__

==Fundamentals==

The brittle-to-ductile transition temperature is a physical [[Material Value|characteristic value]] that describes a fundamental change in [[Material & Werkstoff|material]] behaviour. For technical reasons, the focus is often on material [[Toughness|toughness]], e.g. impact or [[Notched Impact Test|notched impact strength]], or [[Fracture Mechanical Testing|fracture mechanics parameters]] such as critical [[J-Integral Evaluation Methods (Overview)|J-values]] or [[Crack Opening|crack opening]] [[Crack Tip Opening Displacement Concept (CTOD)|displacement]].

==Determination of the brittle-tough transition temperature using the example of impact-resistant polyamide==

The brittle-to-ductile transition temperature indicates the temperature at which a change in the [[Fracture Behaviour|fracture behaviour]] of a [[Material & Werkstoff|material]] occurs, i.e. the [[Toughness|toughness]] of the material increases from a low to a high level. This is associated with a sharp increase in the toughness characteristics. In addition, a change in the deformation and fracture behaviour can often occur in the form of, for example, white fracture (see: [[Fracture Types|fracture types]]) or pronounced plastic [[Deformation|deformation]].

The example (see '''Figure''') shows the [[Crack Toughness|crack toughness]] J of impact-modified polyamide 6 ([[Plastics – Symbols and Abbreviated Terms|abbreviation]]: PA6) as a function of the test temperature. The proportion of impact modifier was varied between 5 and 30 wt.-%. It can be seen that these materials exhibit a [[Brittle-Tough Transition|brittle-tough transition]], the position of which depends on the modifier content.

[[File:Brittle-Tough-Transition_Temperature-Fig.jpg|400px]]
{|
|- valign="top"
|width="50px"|'''Figure''':
|width="600px" |Dependence of fracture mechanical toughness values on test temperature for impact-modified polyamide 6 materials (the arrows indicate the brittle-tough transition temperature)
|}

==See also==

* [[Fracture Mechanical Testing|Fracture mechanical testing]]
* [[Brittle-Tough Transition|Brittle-tough transition]]
* [[Instrumented Puncture Impact Test|Instrumented puncture impact test]]
* [[Toughness Temperature Dependence|Toughness temperature dependence]]
* [[ICIT – Types of Impact Load–Deflection Diagrams|ICIT – Types of impact load–deflection diagrams]]
* [[Notch Sensitivity|Notch sensitivity]]

==References==

* [[Grellmann, Wolfgang|Grellmann, W.]], [[Seidler, Sabine|Seidler, S.]] (Eds.): Polymer Testing. Carl Hanser, Munich (2022) 3rd Edition, pp. 257/258 (ISBN 978-1-56990-806-8; E-Book: ISBN 978-1-56990-807-5; see [[AMK-Library]] under A 22)
* [https://www.researchgate.net/profile/Wolfgang-Grellmann Grellmann, W.], Koch, T., [https://www.researchgate.net/profile/Sabine-Seidler Seidler, S.]: Morphology–Toughness Correlation of Polypropylene/Ethylene–Propylene Rubber Blends. Journal of Applied Polymer Science, Vol. 100 (2006) 3364–3371

[[Category:Fracture Mechanics]]

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