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Media type:
E-Article
Title:
Influence of strain rate on ductility of metallic materials
Contributor:
El‐Magd, Essam
Published:
Wiley, 1997
Published in:
Steel Research, 68 (1997) 2, Seite 67-71
Language:
English
DOI:
10.1002/srin.199700544
ISSN:
0177-4832
Origination:
Footnote:
Description:
The flow behaviour of iron and steel X 2 CrNiMo 18 10 is studied in impact tension tests with strain rates between 1000 and 7000 s−1 on smooth specimens and on notched bars. The neck formation is discussed on the basis of the theory of imperfections. The temperature increase during the adiabatic process promotes deformation localisation and instability. However, the stabilising effect of the strain rate sensitivity is dominating and leads to an increase in ductility. On the other hand, increased strain rates reduce the local fracture strain leading to an increased dynamic notch sensitivity. Through combination of experiment and simulation, the location of void initiation could be estimated and the influence of strain rate on the local failure strain could be determined.