Brittle-Tough Transition Temperature
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Brittle-tough transition temperature
Fundamentals
The brittle-to-ductile transition temperature is a physical characteristic value that describes a fundamental change in material behaviour. For technical reasons, the focus is often on material toughness, e.g. impact or notched impact strength, or fracture mechanics parameters such as critical J-values or crack opening 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 of a material occurs, i.e. the 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) or pronounced plastic deformation.
The example (see Figure) shows the crack toughness J of impact-modified polyamide 6 (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, the position of which depends on the modifier content.
| Figure: | 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
- Brittle-tough transition
- Instrumented puncture impact test
- Toughness temperature dependence
- ICIT – Types of impact load–deflection diagrams
- Notch sensitivity
References
- Grellmann, W., 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)
- Grellmann, W., Koch, T., Seidler, S.: Morphology–Toughness Correlation of Polypropylene/Ethylene–Propylene Rubber Blends. Journal of Applied Polymer Science, Vol. 100 (2006) 3364–3371