Reticulated Ceramics Under Bending: the Non‐Linear Regime Before Their Catastrophic Failure

Ortona, Alberto and Rezaei, Ehsan and Bianchi, Giovanni and Gianella, Sandro (2014) Reticulated Ceramics Under Bending: the Non‐Linear Regime Before Their Catastrophic Failure. Advances in Bioceramics and Porous Ceramics VII: A Collection of Papers Presented at the 38th International Conference on Advanced Ceramics and Composites January 27–31, 2014 Daytona Beach, Florida.

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Three batches of Si‐SiC replicated foams with the same morphologies (pore size and elongation) and different Si content were examined under four point flexural test. The use of ER and ACE monitoring devices along with LPPS and the load cell resulted in a set of data giving in situ information about the introduced damage in the foams. ACE technique showed to be more reliable in detecting the cracks. Results of ER monitoring were in accordance with the other data but practical use of this method needs further investigation to improve the sensibility of the technique. By increasing Si content in the foam, first β‐SiC is formed, and then the micro‐porosities and the cavities inside the ligaments are filled with Si which results from a stronger constituent material and hence a stronger foam. Microscopic pictures were also confirming the fact that the micro and macro porosities are filled gradually by increasing the Si content. Weibull moduli of 7.58, 4.30 and 3.66 for batch A, B and C respectively showed the high scatter in the strength results, especially for batch C. It is presumed that microporosities inside the struts of batch B and C cause a wide flaw distribution resulting in low Weibull moduli.

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