Constriction of the fracture
In the tensile test , after the tensile strength has been reached, a local constriction occurs in ductile materials, in the area of which the break then also occurs.
The largest relative change in cross-section that occurs is referred to as the fracture necking ; it is a measure of the ductility of the material:
With
- the initial cross- sectional area of the unloaded test rod
- the smallest cross-sectional area of the broken rod, i.e. the remaining cross-sectional area at the constricted point.
End view of a round sample ( AlMgSi alloy) after ductile fracture
literature
- Elsbeth Wendler-Kalsch, Hubert Graefen: Corrosion damage theory. 1st edition, Springer Verlag, Berlin / Heidelberg 1998, ISBN 978-3-662-22074-0 .
- Volker Läpple: Introduction to strength theory. Text and exercise book, 2nd edition, Vieweg + Teubner Verlag, Wiesbaden 2008, ISBN 978-3-8348-0426-6 .
Web links
- Tensile test on metallic materials (accessed December 6, 2019)
- Fracture behavior of light metals under impact stress (accessed on December 6, 2019)
- To determine cyclical material parameters and damage parameter Wöhler curves (accessed on December 6, 2019)
- Deformation and fracture of modern, high-strength multiphase steels (accessed December 6, 2019)
- Strength and deformation of weldable, heat-treated reinforcing steel in the range of low temperatures (accessed December 6, 2019)