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COMPARISON OF BEAM AND PLATE THEORIES FOR FREE VIBRATIONS OF METAL MATRIX COMPOSITE PRE-TWISTED BLADES

1996; Elsevier BV; Volume: 189; Issue: 2 Linguagem: Inglês

10.1006/jsvi.1996.0012

1095-8568

S.Mohamed Nabi, N. Ganesan,

Structural Analysis and Optimization

Vibration characteristics of pre-twisted metal matric composite blades are analyzed by using beam and plate theories. A beam element with eight degrees of freedom per node has been developed with torsion –flexure, flexure –flexure and shear –flexure couplings which are encountered in twisted composite beams. In the beam analysis, reduced three-dimensional constitutive relations are used. A triangular plate element presented in the literature is used for the composite material to model the beam as a plate structure. Both theories have been validated for the isotropic case. This paper summarizes the quantitative comparison of natural frequencies of composite blade obtained by these theories. A parametric study is carried out for both the beam and plate elements results, the parameters being twist angle, fiber orientation, taper ratio and lamination scheme.