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Effect of strain rate on self-organisation of adiabatic shear bands in steel
Ist Teil von
Materials science and technology, 2020-03, Vol.36 (5), p.556-563
Ort / Verlag
London, England: Taylor & Francis
Erscheinungsjahr
2020
Link zum Volltext
Quelle
Taylor & Francis
Beschreibungen/Notizen
The experiment was conducted by the radical collapse of thick-walled cylinders. Optical microscopic examination showed that sample (
= 7.3 × 10
4
s
−1
, ε
ef
= 0.45) failed to produce adiabatic shear bands (ASBs), while ASBs were obtained in samples (
= 1.48 × 10
5
s
−1
,
ε
ef
= 0.86;
= 1.18 × 10
5
s
−1
, ε
ef
= 0.81), which shows that the energy barrier in shear band formation was decreased with the increase of shear strain rate. With the increase of strain rate, the number of ASBs decreased and the spacing and the average length increased, and the propagation rate of ASBs increased from 213 m s
−1
(
= 1.18 × 10
5
s
−1
) to 417 m s
−1
(
= 1.48 × 10
5
s
−1
).