The present work deals with functionally gradedmaterials (FGM) isotropic plates in the neighborhood of the first-order symmetric\nzero group velocity (S1-ZGV) point. The mechanical properties of functionally graded material (FGM) are assumed to vary\ncontinuously through the thickness of the plate and obey a power law of the volume fraction of the constituents. Governing\nequations for the problem are derived, and the power series technique (PST) isemployed to solve the recursive equations.The impact\nof the FGM basic materials properties on S1-ZGV frequency of FGM plate is investigated. Numerical results show that S1-ZGV\nfrequency is comparatively more sensitive to the shear modulus. The gradient coefficient p does not affect the linear dependence of\nZGV frequency fa as function of cut-off frequency fc; only the slope is slightly varied.
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