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Variation of the Group Velocity of Lamb Wave $S_o$ Mode with the Propagating Direction in the Laminated Unidirectional CFRP Plates  

Kim Young H. (성균관대학교 기계공학부)
Lee Seung Seok (한국표준과학연구원 환경안전계측센터 스마트계측그룹)
Kim Ho Chul (한국과학기술원 물리학과)
Lee Jeong Ki (한국표준과학연구원 환경안전계측센터 스마트계측그룹)
Publication Information
Composites Research / v.18, no.1, 2005 , pp. 38-44 More about this Journal
Abstract
In this paper, the group velocity dispersion curves of the $S_o$ symmetric mode in unidirectional CFRP plate was calculated as varying the propagating direction. The group velocity curve was obtained with the group velocities of the $S_o$ symmetric mode corresponding to 0.2 MHz-mm under the first cut-off frequency in the dispersion curves, and corrected by introducing the slowness curve. The velocities of the $S_o$ symmetric mode in the unidirectional CFRP plate were measured as varying the propagating direction and compared with the col?rotted group velocity curve. The measured velocities were good agreement with the corrected group velocity curve except near the fiber direction which was called the cusp region. It implies that the direction of the group velocities incline toward the fiber direction of the unidirectional CFRP plates when the propagation direction is not accorded with the principal axis. It is supposed that this phenomenon rerults from the preferential propagating the energy toward the direction with the faster propagation velocity.
Keywords
lamb waves; group velocity; anisotropy; composites; CFRP;
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