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Effect of dual-scale microstructure on the toughness of laminar zirconia composites

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Abstract

Numerical study by the finite element method (FEM) is performed to investigate the effect of dual-scale microstructure on the toughness of laminar zirconia composite. The computation is based on the micromechanics constitutive model of polycrystal transformation plasticity developed by Sun et al. [10] where both transformation induced shear and softening effects during autocatalytic transformation are taken into account. The numerical simulation presented in this paper successfully reproduced the experimentally observed two effects of the dual-scale microstructure on the toughness of laminar zirconia composite, i.e., the truncation of the elongated transformation frontal zone that forms in single phase Ce-ZrO2 and the propagation of the transformation zone along the layers normal to the crack plane. Quantitative analysis on the role of microstructure in transformation toughening of laminar zirconia composite is first carried out in the present work which will provide a starting point for the microstructural design of this novel advanced composite in the future.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong

    Sun Qing-**

  2. Department of Engineering Mechanics, Tsinghua University, 100084, Bei**g, People's Republic of China

    Sun Qing-**, Guo Tian-Fu & Li Xue-Jun

  3. Faculty 508, Bei**g University of Aeronautics and Astronomics, 100084, Bei**g, People's Republic of China

    Zhang **ng

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  1. Sun Qing-**
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  2. Guo Tian-Fu
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  3. Li Xue-Jun
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  4. Zhang **ng
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Qing-**, S., Tian-Fu, G., Xue-Jun, L. et al. Effect of dual-scale microstructure on the toughness of laminar zirconia composites. Int J Fract 78, 315–330 (1996). https://doi.org/10.1007/BF00032480

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  • DOI: https://doi.org/10.1007/BF00032480

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