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首页> 外文学位 >Effect of contiguity on the mechanical behavior of co-continuous ceramic-metal composites.
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Effect of contiguity on the mechanical behavior of co-continuous ceramic-metal composites.

机译：连续性对共连续陶瓷-金属复合材料力学性能的影响。

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The mechanical behavior of co-continuous ceramic-metal composites was investigated. The composites were manufactured by molten metal infiltration into alumina preform. Aluminum and copper were used as metal phases and two types of co-continuous composites were obtained. A material processing technique was developed to achieve composites of varying contiguity. Analysis on optical micrographs of the composites was performed to calculate the contiguity of the spherical alumina phase. Quasi-static compression tests and spherical indentation tests were accomplished to study the mechanical properties of the composites. It was found that the contiguity significantly affects the nonlinear stress-strain behavior, whereas the effect on elastic property is relatively small. A new Representative Volume Element (RVE) was introduced to ensure continuous networks in both alumina and metal phases. Measured contiguity and volume fraction were used as parameters to determine the dimensions of RVE. Thermo-mechanical Finite Element Analysis (FEA) was performed on the proposed RVE, to predict the elastic-plastic behavior of the composites. Thermo-mechanical analysis results revealed that the contiguity also affects the thermal residual stress in co-continuous composite. The FEA-predicted nonlinear stress-strain curves were compared to experimental data. Good agreements were observed and it was found that the proposed RVE could be very effective to represent the contiguity and volume fraction.
机译：研究了共连续陶瓷-金属复合材料的力学行为。通过熔融金属渗透到氧化铝预成型坯中来制造复合材料。以铝和铜为金属相，获得了两种类型的共连续复合材料。开发了一种材料加工技术来实现不同连续性的复合材料。对复合材料的光学显微照片进行分析，以计算球形氧化铝相的连续性。完成了准静态压缩试验和球形压痕试验，以研究复合材料的力学性能。已经发现，连续性显着影响非线性应力-应变行为，而对弹性的影响相对较小。引入了新的代表性体积元素（RVE），以确保氧化铝和金属相中的连续网络。测量的连续性和体积分数用作确定RVE尺寸的参数。对提出的RVE进行了热机械有限元分析（FEA），以预测复合材料的弹塑性行为。热力学分析结果表明，连续性还会影响共连续复合材料的热残余应力。 FEA预测的非线性应力-应变曲线与实验数据进行了比较。观察到良好的协议，发现拟议的RVE可以非常有效地表示连续性和体积分数。

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