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The free vibration of functionally graded (FG) beams with various boundary conditions resting on a two-parameter elastic foundation in the thermal environment is studied using the thirdorder shear deformation beam theory. The material properties are temperature-dependent and vary continuously through the thickness direction of the beam, based on a power-law distribution in terms of the volume fraction of the material constituents. In order to discretize the governing equations, the di®erential quadrature method (DQM) in conjunction with the Hamilton's principle is adopted. The convergence of the method is demonstrated. In order to validate the results, comparisons are made with solutions available for the isotropic and FG beams. Through a comprehensive parametric study, the e®ect of various parameters involved on the FG beam was studied. It is concluded that the uniform temperature rise has more signi¯cant e®ect on the frequency parameters than the nonuniform case.

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