Analysis of multiple cracking in metal/ceramic composites with lamellar microstructure
Analysis of multiple cracking in metal/ceramic composites with lamellar microstructure
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DOI：
10.1007/s00419-015-1103-7
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发表时间：
2016
影响因子：
2.8
通讯作者：
M. Kashtalyan;Y. Sinchuk;R. Piat;I. Guz
中科院分区：
文献类型：
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作者：
M. Kashtalyan;Y. Sinchuk;R. Piat;I. Guz
具有层状微结构的金属/陶瓷复合材料是一类新型的金属基复合材料，其制备方法是用熔融铝合金浸渍冷冻铸造或冰模板陶瓷预制体。生产的成本效益和相对较高的陶瓷含量使这种复合材料在汽车、航空航天和生物医学工程中具有许多潜在的应用吸引力。这些复合材料表现出层次化的层状微观结构，具有随机取向的畴，其中所有的陶瓷和金属片片彼此平行，这是由水-陶瓷悬浮液在冷冻铸造或冰模板过程中形成的冰晶造成的。本文采用分析与计算相结合的方法，对具有层状微观结构的金属/陶瓷复合材料单畴试样进行了理论建模。采用改进的二维剪切滞后法和有限元法确定了陶瓷层中含有多个横向裂纹的试样的应力场。利用有限元建模，确定剪切层厚度，并将其作为分析模型的输入。利用等效约束模型预测了多次横向开裂对试样刚度性能的影响。
Metal/ceramic composites with lamellar microstructures are a novel class of metal-matrix composites produced by infiltration of freeze-cast or ice-templated ceramic preforms with molten aluminium alloy. The cost-effectiveness of production and relatively high ceramic content make such composites attractive to a number of potential applications in the automotive, aerospace and biomedical engineering. A hierarchical lamellar microstructure exhibited by these composites, with randomly orientated domains in which all ceramic and metallic lamellae are parallel to each other, is the result of the ice crystal formation during freeze-casting or ice-templating of preforms from water–ceramic suspensions. In this paper, a single-domain sample of metal/ceramic composite with lamellar microstructure is modelled theoretically using a combination of analytical and computational means. Stress field in the sample containing multiple transverse cracks in the ceramic layer is determined using a modified 2-D shear lag approach and a finite element method. Using finite element modelling, the shear layer thickness is determined and used as input in the analytical model. Degradation of stiffness properties of the sample due to multiple transverse cracking is predicted using the equivalent constraint model.