Minimal compliance design for metal-ceramic composites with lamellar microstructures
Minimal compliance design for metal-ceramic composites with lamellar microstructures
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DOI：
10.1016/j.actamat.2011.04.026
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发表时间：
2011-07-01
期刊：
影响因子：
9.4
通讯作者：
Sigmund, O.
中科院分区：
文献类型：
--
作者：
Piat, R.;Sinchuk, Y.;Sigmund, O.
在优化设计的背景下，研究了熔融渗透陶瓷预制体制备的金属陶瓷复合材料。该陶瓷预制体是通过Al2O3颗粒悬浮液的冷冻铸造工艺制造的。复合材料的微观结构表现为层状畴的分布。以局部陶瓷体积分数和片层取向为设计变量，基于拓扑优化和有限元方法，求解了不同几何形状和边界条件下金属陶瓷样品的最小柔度优化问题。采用细观力学模型计算了复合材料的有效弹性性能。计算了优化后的局部片层取向和陶瓷含量，并分析了初始（陶瓷含量和取向不变的试样）与优化设计的差异。在优化后的结构中，应变场的最大值、最小值和平均值的绝对值显著减小。(C) 2011材料学报Elsevier Ltd.出版。版权所有。
Metal-ceramic composites produced by melt infiltration of ceramic preforms are studied in an optimal design context. The ceramic preforms are manufactured through a process of freeze-casting of Al2O3 particle suspension. The microstructure of these composites can be presented as distributions of lamellar domains. With local ceramic volume fraction and lamella orientation chosen as the design variables, a minimum compliance optimization problem is solved based on topology optimization and finite element methods for metal ceramic samples with different geometries and boundary conditions. Micromechanical models are applied for the calculation of the effective elastic properties of the composites. Optimized local lamella orientations and ceramic contents are calculated, and the difference between the initial (specimen with constant ceramic content and orientation) and the optimized designs is analyzed. Significant reductions in absolute values of the maximum, minimum and mean values of strain fields in the optimized structures are observed. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.