Constriction of the fracture

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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:


  • 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.


  • 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 .

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