Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg



Optimisation and standardisation of the tensile test with miniaturised samples for an improved characterisation of thin sheet components' local properties



Project Status: finished

Members


Within this research project, the influence of a miniaturisation of tensile specimens on the determined flow curves and the characteristic mechanical values is evaluated. Therefore, the sample dimensions of the standard A80 specimen geometry according to DIN 6892-1 are scaled using a numerical simulation. All specimen geometries that lead to uniaxial tension will be identified. The results are validated by tension tests with scaled samples. Afterwards, an adapted clamping device is developed as well as an adequate measuring concept and manufacturing process for the miniaturised tensile specimens. Finally, the flow curves and characteristic values, determined with miniaturised specimens are compared to data from conventional tensile tests and the effects of the scaling are reviewed.

A first investigation of three miniaturised specimen geometries showed that even a strongly scaled geometry with a length and width of 2 mm resulted in a state of uniaxial tension. However, the determined flow curves and characteristic values of the miniaturised specimens are different from the results of an A50 tension sample according to DIN with a length of 62.5 mm and a width of 12.5 mm.

 

Specimen geometries of the three tested miniaturised samples (schematic) and comparison of the determined flow curves with the result of a tensile test using an A50 sample according to DIN


Research Groups


Publications

    2018

    • Degner, J.; Herrmann, J.; Junker, F.; Berendt, E.; Merklein, M.:
      Leichtbauwerkstoffe für den modernen Automobilbau.
      Zeitschrift Konstruktion 3(2018), pp. 50-54

    Letztes Update: 16.09.2016