The aim of this paper is to extract the dispersion parameters, i.e. phase velocity, energy velocity and attenuation, of orthotropic thin-walled waveguides with generic cross-section. To this end, a semi-analytical finite element (SAFE) formulation is presented, which is based on the Reissner-Mindlin theory of curved shells. Complex axial wavenumbers and mode shapes of guided wave modes are extracted from a second-order polynomial eigenvalue problem, while the energy velocity is post-processed using the computed eigensolutions and SAFE operators. Different numerical examples are proposed, for which the obtained results are in very good agreement with those computed using other well-stated SAFE formulations.
Wave dispersion in thin-walled orthotropic waveguides using the first order shear deformation theory / Mazzotti, M; Bartoli, I.; Miniaci, M.; Marzani, A.. - In: THIN-WALLED STRUCTURES. - ISSN 0263-8231. - STAMPA. - 103:(2016), pp. 128-140. [10.1016/j.tws.2016.02.014]
Wave dispersion in thin-walled orthotropic waveguides using the first order shear deformation theory
MARZANI, ALESSANDRO
2016
Abstract
The aim of this paper is to extract the dispersion parameters, i.e. phase velocity, energy velocity and attenuation, of orthotropic thin-walled waveguides with generic cross-section. To this end, a semi-analytical finite element (SAFE) formulation is presented, which is based on the Reissner-Mindlin theory of curved shells. Complex axial wavenumbers and mode shapes of guided wave modes are extracted from a second-order polynomial eigenvalue problem, while the energy velocity is post-processed using the computed eigensolutions and SAFE operators. Different numerical examples are proposed, for which the obtained results are in very good agreement with those computed using other well-stated SAFE formulations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
