Mechanical properties of functionally graded 2-D cellular structures: A finite element simulation
Mechanical properties of functionally graded 2-D cellular structures: A finite element simulation
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DOI：
10.1016/j.msea.2008.08.040
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发表时间：
2009-01-15
期刊：
影响因子：
6.4
通讯作者：
Warner, G.
中科院分区：
文献类型：
--
作者：
Ajdari, A.;Canavan, P.;Warner, G.
用于制造植入物或骨替代物的功能梯度细胞结构（诸如生物启发功能梯度材料）是一类具有低密度和新颖的物理、机械、热、电和声学性质的材料。泡孔尺寸分布的逐渐增加可以赋予许多通过具有均匀的泡孔结构可能无法实现的改进的性质。本研究利用有限元素法探讨功能梯度Voronoi结构之单轴及双轴压缩行为。有限元分析表明，随着密度梯度的增大，结构的有效弹性模量和屈服强度均增大。然而，功能梯度结构的整体弹性模量比整体屈服强度对密度梯度更敏感。研究还表明，具有不同密度梯度的功能梯度结构对随机缺失的细胞壁具有相似的敏感性。蠕变分析表明，具有较高密度梯度的结构具有较低的稳态蠕变速率相比，具有较低的密度梯度的结构。(C)2008 Elsevier B.V.保留所有权利。
Functionally graded cellular structures such as bio-inspired functionally graded materials for manufacturing implants or bone replacement, are a class of materials with low densities and novel physical, mechanical, thermal, electrical and acoustic properties. A gradual increase in cell size distribution, can impart many improved properties which may not be achieved by having a uniform cellular structure.The material properties of functionally graded cellular structures as a function of density gradient have not been previously addressed within the literature. In this study, the finite element method is used to investigate the compressive uniaxial and biaxial behavior of functionally graded Voronoi structures. Furthermore, the effect of missing cell walls on its overall mechanical (elastic, plastic,and creep) properties is investigated.The finite element analysis showed that the overall effective elastic modulus and yield strength of structures increased by increasing the density gradient. However, the overall elastic modulus of functionally graded structures was more sensitive to density gradient than the overall yield strength. The study also showed that the functionally graded structures with different density gradient had similar sensitivity to random missing cell walls. Creep analysis suggested that the structures with higher density gradient had lower steady-state creep rate compared to that of structures with lower density gradient. (C) 2008 Elsevier B.V. All rights reserved.