Dynamic Deformation Twinning in Shock‐Loaded Iron
作者:
J. N. Johnson,
R. W. Rohde,
期刊:
Journal of Applied Physics
(AIP Available online 1971)
卷期:
Volume 42,
issue 11
页码: 4171-4182
ISSN:0021-8979
年代: 1971
DOI:10.1063/1.1659750
出版商: AIP
数据来源: AIP
摘要:
Deformation twinning has been observed in shock‐loaded samples of heat‐treated Ferrovac E iron at peak stresses from 3 to 16 kbar. In this range, the volume fraction of twins increases monotonically from zero to approximately 4&percent;. In instrumented transmitted‐wave measurements stress relaxation was observed behind the elastic precursor for propagation distances of 12 mm or greater, but not at smaller distances. An analytical description of dynamic deformation twinning which adequately describes experimental observations on shock‐wave propagation in Ferrovac E iron is proposed. This analysis is based on models for the growth of twin platelets combined with the equation &ggr;=k&agr; relating the plastic strain &ggr; to the twinning shearkand the volume fraction of twins &agr;. Dynamic deformation twinning in impact‐loaded solids appears to be fairly well established both from experimental and analytical points of view and certainly must be considered as a possible physical mechanism in the description of plastic flow at high strain rates.
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