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Which finite element best fit to model orthotropic plates? 


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The finite element method (FEM) has been used to model orthotropic plates in several studies. One approach is the use of a four-node quadrilateral displacement-based Trefftz-type plate element within the framework of the unsymmetric FEM. This element employs modified isoparametric interpolations and Trefftz functions to effectively enrich the deflection and satisfy the governing equations of orthotropic Mindlin-Reissner plates . Another approach is the utilization of a semi-analytical FEM algorithm, which has been used to plot dispersion curves of isotropic aluminum and orthotropic plates. The accuracy of this method depends on the number of elements per plate thickness . Additionally, a finite element formulation based on the two-variable refined plate theory (RPT) has been proposed for dynamic analysis of orthotropic plates. This formulation utilizes a 4-node rectangular plate element and an unconditionally stable implicit Newmark scheme for temporal discretization . Another efficient element for analyzing orthotropic plates is the quadrilateral element based on the hybrid-Trefftz method. This element has been shown to provide high accuracy even for coarse meshes . Finally, a triangular based prismatic finite element has been introduced for the FEM solution of laminated plates and shells. This element has locking-free behavior, good stress distribution, and can handle large displacements and distorted meshes .

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The paper proposes a triangular based prismatic finite element that is suitable for modeling orthotropic plates.
The paper proposes a quadrilateral element called QHT-OR that is efficient for modeling orthotropic plates.
The paper does not explicitly mention which finite element is the best fit for modeling orthotropic plates.
The paper proposes a new four-node quadrilateral displacement-based Trefftz-type plate element that is suitable for modeling orthotropic plates.
The paper does not explicitly mention which finite element method is best for modeling orthotropic plates.

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