Analysis of elastic functionally graded materials under large displacements via high-order tetrahedral elements

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• 作者：J.P. Pascon ; ^{jppascon@sc.usp.br} ; H.B. Coda
• 关键词：Functionally graded material ; Large displacement analysis ; High-order tetrahedral finite element ; Saint Venant&ndash ; Kirchhoff law ; Locking free behavior
• 刊名：Finite Elements in Analysis and Design
• 出版年：2012
• 出版时间：March, 2012
• 年：2012
• 卷：50
• 期：Complete
• 页码：33-47
• 全文大小：2221 K

文摘

The purpose of this study is to present a position based tetrahedral finite element method of any order to accurately predict the mechanical behavior of solids constituted by functionally graded elastic materials and subjected to large displacements. The application of high-order elements makes it possible to overcome the volumetric and shear locking that appears in usual homogeneous isotropic situations or even in non-homogeneous cases developing small or large displacements. The use of parallel processing to improve the computational efficiency, allows employing high-order elements instead of low-order ones with reduced integration techniques or strain enhancements.

The Green-Lagrange strain is adopted and the constitutive relation is the functionally graded Saint Venant-Kirchhoff law. The equilibrium is achieved by the minimum total potential energy principle. Examples of large displacement problems are presented and results confirm the locking free behavior of high-order elements for non-homogeneous materials.