journal article

Journal Article

Text

Journal of Applied Physics. 2010, 107(4), p. 043506

Dynamic yielding in lithium fluoride and aluminum

American Institute of Physics

English

Text

2010-02-15

https://doi.org/10.1063/1.3275503

Yukio Sano and Tomokazu Sano, Journal of Applied Physics 107(4), 043506 (2010) https://doi.org/10.1063/1.3275503

At a time immediately after shock loading, a kink (a weak discontinuity or a discontinuity in slope) occurs at a position in an unsteady portion in a smooth plane wave front in a lithium fluoride single crystal (material III b) or in 1060-0 aluminum due to the instability of the wave front. After the occurrence of the kink, a zone is produced and broadened with time between a near steady precursor ahead of the kink and a plastic wave behind it in a weak-discontinuity plane wave by the difference in the propagation velocity between them. Stress relaxes in the zone, which is called a follower, and the precursor decay takes place due to the stress relaxation. During the decay process, the large increase in plastic flow occurs in the vicinity of the leading edge of the follower, causes yielding at the leading edge, and stabilizes the weak-discontinuity wave. The stress-strain (σ-ε) history caused by the follower rotates clockwise with time around the yield point. The rotation yields different σ-ε histories behind the point and therefore different types of the dynamic σ-ε relation. Dynamic yield phenomena are illustrated by showing the schematic diagrams of three different types of the dynamic σ-ε relation, which are caused by weak-discontinuity plane waves composed of a precursor C, a follower (i) C, (ii) I or II, or (iii) R′ or Rb, and a plastic wave C behind the follower. Here C is the contraction (compression) wave, I and II are the degenerate contraction waves I and II, R′ is the subrarefaction wave, and Rb is the rarefaction wave. © 2010 American Institute of Physics.

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Yukio Sano and Tomokazu Sano, Journal of Applied Physics 107, 043506 and may be found at https://doi.org/10.1063/1.3275503.

89435

Dynamic yielding in lithium fluoride and aluminum

American Institute of Physics

English

2010-02-15

Journal of Applied Physics

107

4

043506

https://doi.org/10.1063/1.3275503

https://hdl.handle.net/11094/89435