Conversion of elongation values

  • András Bocz Dunaferr Labor Nonprofit Kft.
  • Balázs Kiss Dunaferr Labor Nonprofit Kft.
  • Dénes Márkus Dunaferr Labor Nonprofit Kft.
  • Zsolt Narancsik Dunaferr Labor Nonprofit Kft.
  • Viktor Vainel Dunaferr Labor Nonprofit Kft.
Keywords: elongation, elongation after fracture, gauge length, ISO 2566-1

Abstract

Can an elongation value determined in a tensile test really be converted to an unmeasured elongation of a diff erent signal distance? How accurately can a measured elongation at break be converted? The actuality of the topic is due to changes in the ISO 2566-1 standard in 2021 and corrected in 2022, which deals with the conversion of elongation values. In this article, we compare the results of measured elongation at break at diff erent signal distances – gauge lengths – with the elongation values calculated using the formulae in ISO 2566-1.

As materials testers, we are averse to replacing measurable material properties with somehow trained results. The results of a material test capture the properties of the material at that moment in time, this is true for the material tested under the given conditions and only for that material.

Models based on test results can of course produce relationships that can be used as a guide, a “rule of thumb”, such as the relationship between hardness and tensile strength of steels.

In this article, we examine the extent to which the elongation at break values recalculated using the formulae in the standard correspond to the results from actual testing.

References

MSZ EN ISO 2566-1: 2022 Az Sz. K. 2022. évi 8. számában közzétett, az ISO által 2022. júniusban kiadott helyesbített változat. Acélok. A nyúlásértékek átszámítása

MSZ EN ISO 6892-1: 2020 Fémek. Szakítóvizsgálat 1. rész: Vizsgálati módszer szobahőmérsékleten

Bocz András, Kiss Balázs, Márkus Dénes, Narancsik Zsolt, Vainel Viktor (2021): Nyúlásmérés rejtelmei lágyacéloknál. Anyagvizsgálók Lapja, 2021/III, 25-29. https://avilap.hu/view_article.jsp?article=1211

D. A. Oliver (1928): Proposed new criteria of ductility from a new law connecting the percentage elongation with size of test-piece. Proc. Inst. Mech. Eng., 115/1, 1-38. https:// doi.org/10.1243/PIME_PROC_1928_115_019_02 https://doi.org/10.1243/PIME_PROC_1928_115_019_02

Published
2024-09-11
How to Cite
BoczA., KissB., MárkusD., NarancsikZ., & VainelV. (2024). Conversion of elongation values. Bányászati és Kohászati Lapok, 157(2), 45-50. Retrieved from https://ojs3.mtak.hu/index.php/bkl/article/view/17109
Section
Cikkek