ANFIS Lamb wave Love wave Q1-390 QA1-939 analytical solution attenuation bic Book Industry Communication::P Mathematics & science bimodulus circular plate clustering combined mechanical loads damping coefficient different moduli in tension and compression dispersion elastic foundation elastoplastic analysis electroelastic solution elliptical hole evanescent wave external pressure failure and damage finite element analysis finite element method finite elements flow theory of plasticity free vibration characteristics functional graded saturated material functionally graded beams functionally graded materials