Fracture Toughness Characterization of Carbon Bonded Alumina Using Chevron Notched Specimens

H. Zielke; Martin Abendroth; Meinhard Kuna

doi:10.4028/www.scientific.net/KEM.754.71

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 754Fracture Toughness Characterization of Carbon...

Fracture Toughness Characterization of Carbon Bonded Alumina Using Chevron Notched Specimens

Abstract:

A new generation of multifunctional filters is made of carbon bonded alumina and is investigated within the collaborative research center 920 (CRC920). These filters are used during a casting process with the aim of reducing non-metallic inclusions in the cast product. The high thermal and mechanical loading of the filter requires a fracture mechanical characterization of the investigated ceramic material. In order to determine the fracture toughness of the ceramic material, a chevron-notched beam method (CNB) is applied. A 4-point-bending test set-up was constructed and brought into service, at which the load-displacement curve of small chevron-notched specimens (5 x 6 x 25 mm³) can be measured. The set-up offers the possibility of testing specimens at temperatures up to 1000oC. Preceding numerically work using the finite element method was performed to identify a suitable notch geometry. For this purpose a cohesive zone model was used. A parameter study is presented, which shows the influence of the notch parameter on the load-displacement curve.

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Periodical:

Key Engineering Materials (Volume 754)

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71-74

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.754.71

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Online since:

September 2017

Authors:

H. Zielke*, Martin Abendroth, Meinhard Kuna

Keywords:

Carbon Bonded Alumina, Chevron-Notched Beam Method, Finite Element Analysis, Fracture Toughness

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