Fracture characteristics of Al2O3/YAG composite at room temperature to 2023 K

The fracture behavior of the notched unidirectionally solidified eutectic Al2O3/YAG composite was investigated by tensile test at room temperature to 2023 K, and the results were analyzed by the finite element method. The stress-strain behavior, notched strength and the fracture toughness were stron...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2005, Vol.25 (8), p.1241-1249
Main Authors: OCHIAI, S, SAKAI, Y, TAKAHASHI, T, SATO, K, TANAKA, M, HOJO, M, OKUDA, H, WAKU, Y, NAKAGAWA, N, SAKATA, S, MITANI, A
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Cermets, ceramic and refractory composites
Chemical industry and chemicals
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Other materials
Physics
Specific materials
Structural ceramics
Technical ceramics
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Summary:The fracture behavior of the notched unidirectionally solidified eutectic Al2O3/YAG composite was investigated by tensile test at room temperature to 2023 K, and the results were analyzed by the finite element method. The stress-strain behavior, notched strength and the fracture toughness were strongly dependent on temperature and displacement speed. The specimens fractured in a brittle manner at low temperatures and at high displacement speeds but in a ductile manner accompanying plastic deformation at high temperatures and at low displacement speeds. The notched strength for a given displacement speed increased with increasing temperature. The stress distribution and the plastic zone size ahead of the notch were calculated by a finite element method using the dependence of flow stress on temperature and displacement speed. Based on the calculation result, the experimentally observed increase in the notched strength with increasing temperature and decreasing displacement speed up to the maximum value could be accounted for by the increase in plastic zone size ahead of the notch. Also, the observed decrease in notched strength with further increasing temperature and decreasing displacement speed could be accounted for by the decrease in the stress carrying capacity of the yielded ligament.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2005.01.006