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Open AccessFeature PaperArticle

Natural Frequency Analysis of Functionally Graded Orthotropic Cross-Ply Plates Based on the Finite Element Method

1
DICAM Department, University of Bologna, Viale del Risorgimento, 2, 40136 Bologna BO, Italy
2
DESD Department, University of San Marino, Via Consiglio dei Sessanta, 99, 47891 Repubblica Di San Marino, San Marino
3
DIEF Department, University of Modena and Reggio Emilia, Via Vivarelli, 10, 41125 Modena MO, Italy
*
Author to whom correspondence should be addressed.
Math. Comput. Appl. 2019, 24(2), 52; https://doi.org/10.3390/mca24020052
Received: 30 April 2019 / Accepted: 17 May 2019 / Published: 19 May 2019
This paper aims to present a finite element (FE) formulation for the study of the natural frequencies of functionally graded orthotropic laminated plates characterized by cross-ply layups. A nine-node Lagrange element is considered for this purpose. The main novelty of the research is the modelling of the reinforcing fibers of the orthotropic layers assuming a non-uniform distribution in the thickness direction. The Halpin–Tsai approach is employed to define the overall mechanical properties of the composite layers starting from the features of the two constituents (fiber and epoxy resin). Several functions are introduced to describe the dependency on the thickness coordinate of their volume fraction. The analyses are carried out in the theoretical framework provided by the first-order shear deformation theory (FSDT) for laminated thick plates. Nevertheless, the same approach is used to deal with the vibration analysis of thin plates, neglecting the shear stiffness of the structure. This objective is achieved by properly choosing the value of the shear correction factor, without any modification in the formulation. The results prove that the dynamic response of thin and thick plates, in terms of natural frequencies and mode shapes, is affected by the non-uniform placement of the fibers along the thickness direction. View Full-Text
Keywords: finite element modelling; laminated composite plates; non-uniform mechanical properties finite element modelling; laminated composite plates; non-uniform mechanical properties
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MDPI and ACS Style

Bacciocchi, M.; Tarantino, A.M. Natural Frequency Analysis of Functionally Graded Orthotropic Cross-Ply Plates Based on the Finite Element Method. Math. Comput. Appl. 2019, 24, 52.

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