Forum Technical Discussions Re: Lamb wave dispersion curves Posted by: Neelima Erukulla , E-mail: Address, on August 18, 2008 at 06:09 : In Reply to: Re: Lamb wave dispersion curves posted by : amir , E-mail: Address, on July 01, 2008 at 20:39 : -Hi, I am writing my own code for plotting dispersion curves for guided waves propagating in two layered cylinder. I have derived the equation of motion and also applied the relevant boundary conditions. I have two questions to ask and would appreciate if any one can answer them 1) what boundary condition should be considered at the interface of the two layers. Should stress continuity and displacement continuity be considered OR strain and displacement continuities be considere. The cylinder is composed of two layers of two different materials. 2) I am unable to find the solution for layer matrix I derived from equation of motion. Please can anyone tell me how I can find the roots of this matrix (dispersion equation) Thanks. Regards, Neelima ---------- Start Original Message ----------- : : : Hi, : You can use thids book, : wave propagation in solids By : Achenbach : or : wave propagation in layered anisotropic media : By: Adnan h. Nayfeh : if you get answer please aware me. : : Regards, : : Amir ------------ End Original Message ------------ Follow Ups: Re: Lamb wave dispersion curves James Barshinger 15:34 Aug-18-2008 (2) Re: Lamb wave dispersion curves G.Sudheer 18:01 Sep-01-2008 (1) Post a Followup: Name: E-Mail: Subject: Comments: ----------- Start Original Message ----------- : -Hi, : : I am writing my own code for plotting dispersion curves for guided waves propagating in two layered cylinder. I have derived the equation of motion and also applied the relevant boundary conditions. I have two questions to ask and would appreciate if any one can answer them : 1) what boundary condition should be considered at the interface of the two layers. : Should stress continuity and displacement continuity be considered : OR : strain and displacement continuities be considere. The cylinder is composed of two layers of two different materials. : 2) I am unable to find the solution for layer matrix I derived from equation of motion. Please can anyone tell me how I can find the roots of this matrix (dispersion equation) : : Thanks. : Regards, : Neelima : ---------- Start Original Message ----------- : : : : Hi, : : You can use thids book, : : wave propagation in solids By : Achenbach : : or : : wave propagation in layered anisotropic media : : By: Adnan h. Nayfeh : : if you get answer please aware me. : : : Regards, : : : Amir ------------ End Original Message ------------ Optional Link URL: Example: "http://www....html". Alternative write "http://www.ndt.net/wshop/attach/filename.htm" if you transfered a filename.htm via FTP Page Title: is important! Optional Image URL: http://www....gif Attention! Please click the button only once. This may take a moment to process Forum Technical Discussions Help