Document Details Document Type : Article In Journal  Document Title : Shape of dispersion curves in the Rayleigh-Lamb spectrum Shape of dispersion curves in the Rayleigh-Lamb spectrum   Document Language : Arabic  Abstract : THE FOLLOWING FEATURES of the symmetric Lamb modes in an elastic waveguide are well known: 1. There exists no mode with phase speed less than c(R). 2. There is only one mode whose speed asymptotically approaches c(R). 3. A horizontal line above c = c(T) (including the line c = c(L)) cannot be an asymptote to any of the modes. 4. Phase speed of all modes, except the lowest mode, approaches c(T) as the frequency becomes very large. The above features characterize the spectrum which is obtained numerically or expertimentally but are not fully understood analytically. We analyze the Rayleigh--Lamb equation and provide analytical explanation for the above features.   Journal Name : ARCHIVES OF MECHANICS  Volume : 56  Issue Number : 2  Publishing Year : 2004 AH   Added Date : Friday, June 20, 2008  Researchers Researcher Name (Arabic) Researcher Name (English) Researcher Type Dr Grade Email . Ahmad F Researcher     Back To Researches Page