Experimental and Numerical Determination of the Elastic Moduli of Freeze Cast Mmc with Different Lamellae Orientation
Experimental and Numerical Determination of the Elastic Moduli of Freeze Cast Mmc with Different Lamellae Orientation
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不同片层取向的冷冻铸造MMC弹性模量的实验和数值测定
DOI：
10.1002/9781119211747.ch13
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
R. Piat
中科院分区：
文献类型：
--
作者：
M. Merzkirch;Y. Sinchuk;K. A. Weidenmann;R. Piat
目前的研究涉及铝渗透冷冻铸造 MMC 的弹性模量的比较，这些弹性模量是在拉伸载荷下通过实验确定并使用有限元方法计算的。研究了不同渗透样本（平均增强含量约为 33.6 vol.%）关于冷冻铸造预制件薄片的方向。以前的工作重点是用超声波相位光谱等无损方法测定弹性模量。当前工作的目的包括比较实验和计算（数值和分析）弹性值以及与渗透过程引起的残余孔隙度的相关性。使用基于显微照片的自编程工具研究了一个多域和多个单域样本的片层方向。制造了微型拉伸样品，以分别实现陶瓷预制件内单域的位置和标距。应变是通过光学方法测量的。实验研究的结果与文献的分析范围非常吻合。微观结构的显微照片已用于二维有限元模型的开发和有效弹性模量的计算。可以看出，与实验结果相比，计算出的杨氏模量稍微高估了。这可能会导致忽略孔隙率的实现、由于数值模型的开发而进行的图像处理以及计算中片层和基体之间的理想接触的建模而导致的微观结构方向的变化。
The current investigations deal with the comparison of the elastic moduli of an aluminum infiltrated freeze cast MMC determined experimentally under tensile loading and calculated using Finite Element Method. Different infiltrated specimens ‐ with an average reinforcing content of about 33.6 vol.‐% ‐ have been investigated concerning the orientation of the lamellae of the freeze cast preform. Former work focused on the determination of the elastic moduli with non‐destructive methods like ultrasonic phase spectroscopy. The aim of the current work includes the comparison between experimental and calculated (numerical and analytical) elastic values and correlation to the residual porosity due to the infiltration process. One poly‐domain and multiple single‐domain specimens have been investigated concerning the orientation of the lamellae with a self‐programmed tool based on micrographs. Miniature tensile specimens have been manufactured in order to realize the position of single‐domains within the ceramic preform and the gauge length, respectively. Strain has been measured via optical methods. The results concerning the experimental investigations showed a good agreement to analytical bounds from literature. Micrographs of the microstructure have been used for development of the two dimensional FE model and calculation of the effective elastic moduli. It can be shown that the calculated Young's moduli are slightly overestimated in comparison to the experimental results. This can be lead back to the negligence of the implementation of the porosity, changes of the microstructure orientation due image processing by development of the numerical model as well as the modelling of an ideal contact between lamellae and matrix within the calculations.
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