COMPARISON OF BEAM AND PLATE THEORIES FOR FREE VIBRATIONS OF METAL MATRIX COMPOSITE PRE-TWISTED BLADES
✍ Scribed by S. Mohamed Nabi; N. Ganesan
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 389 KB
- Volume
- 189
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
Vibration characteristics of pre-twisted metal matrix 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 bean 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 the 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.