Conditions for the Occurrence of Decoupling Planes in Anisotropic Elastic Materials
نویسنده
چکیده
Les plans de symtrie sont souvent identifis par lÕexistence dÕune polarisation pure perpendiculaire ces plans. Cependant, ce type de polarisation peut apparatre sans que le plan soit un plan de symtrie. Les plans qui prsentent une polarisation pure suivant leurs normales sont appels Ç plans de dcouplage È, car le systme de trois quations linaires couples par les cosinus directeurs du vecteur de polarisation se dcouple en une seule quation relative la polarisation normale au plan et en deux quations couples relatives aux polarisations dans le plan. CÕest un plan de symtrie uniquement dans le cas o la direction perpendiculaire un Ç plan de dcouplage È est une Ç direction longitudinale È (cÕest-dire, si dans cette direction, il y a des ondes P et des ondes S pures). Sans la prsence de la direction purement longitudinale associe, un plan de dcouplage Ç brut È pourrait tre interprt faussement comme un plan de symtrie.
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