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Materials 2019, 12(2), 287; https://doi.org/10.3390/ma12020287

On the Finite Element Implementation of Functionally Graded Materials

Department of Engineering, Cambridge University, Cambridge CB2 1PZ, UK
Received: 24 December 2018 / Revised: 13 January 2019 / Accepted: 15 January 2019 / Published: 17 January 2019
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Abstract

We investigate the numerical implementation of functionally graded properties in the context of the finite element method. The macroscopic variation of elastic properties inherent to functionally graded materials (FGMs) is introduced at the element level by means of the two most commonly used schemes: (i) nodal based gradation, often via an auxiliary (non-physical) temperature-dependence, and (ii) Gauss integration point based gradation. These formulations are extensively compared by solving a number of paradigmatic boundary value problems for which analytical solutions can be obtained. The nature of the notable differences revealed by the results is investigated in detail. We provide a user subroutine for the finite element package ABAQUS to overcome the limitations of the most popular approach for implementing FGMs in commercial software. The use of reliable, element-based formulations to define the material property variation could be key in fracture assessment of FGMs and other non-homogeneous materials. View Full-Text
Keywords: functionally graded materials; finite element analysis; graded finite elements functionally graded materials; finite element analysis; graded finite elements
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Martínez-Pañeda, E. On the Finite Element Implementation of Functionally Graded Materials. Materials 2019, 12, 287.

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