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Influence of strain rate on ductility of metallic materials
Author(s) -
ElMagd Essam
Publication year - 1997
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199700544
Subject(s) - strain rate , materials science , ductility (earth science) , void (composites) , strain (injury) , adiabatic process , instability , composite material , dynamic strain aging , deformation (meteorology) , slow strain rate testing , sensitivity (control systems) , plasticity , fracture (geology) , tension (geology) , metallurgy , mechanics , compression (physics) , thermodynamics , creep , medicine , physics , alloy , electronic engineering , stress corrosion cracking , engineering
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.