Existence of Negative Group Velocities in Lamb Waves

Existence of Negative Group Velocities in Lamb Waves

It is known only fragmentarily that negative group velocities exist in some lower modes of Lamb waves whose phase velocities are very high. This paper reveals numerically that the existence of negative group velocities depends not only on the frequency-thickness product but also on Poisson's ra...

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Veröffentlicht in:Japanese Journal of Applied Physics 1987-01, Vol.26 (S1), p.171
1. Verfasser: Negishi, Katsuo
Format: Artikel
Sprache:eng
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Zusammenfassung:It is known only fragmentarily that negative group velocities exist in some lower modes of Lamb waves whose phase velocities are very high. This paper reveals numerically that the existence of negative group velocities depends not only on the frequency-thickness product but also on Poisson's ratio σ of the plate material. Negative group velocities exist in S1 mode for σ
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAPS.26S1.171