Toughening Analysis of Mixed Cracks in Transformation Toughened Ceramics on Influence of SD Effect

Zhen Qing Wang; Zeng Jie Yang; Li Qiang Tang

doi:10.4028/www.scientific.net/KEM.452-453.145

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 452-453Toughening Analysis of Mixed Cracks in...

Toughening Analysis of Mixed Cracks in Transformation Toughened Ceramics on Influence of SD Effect

Abstract:

Considering the SD effect, the parabolic-type yield criterion is obtained by using a new parameter. And by analogy with associated plastic flow rule, the ceramic phase transformation constitutive model is established. Under plane strain condition, the theoretical toughening expressions of mixed-mode I-II stationary cracks and steady-state growing cracks are developed by applying the weight function method. And the toughening effect is discussed under the influence of Poisson ratio, parameter and . The simulation results show that these phase transformation toughening effects are in good agreement with experimental results. And comparing with other yield criterions, it is more in line with actual characteristics of zirconia ceramic materials, when the expression of mixed I-II crack is reduced to mode I crack. And it also could provide theoretical support and reference for the further research of ceramic phase transformation toughening.

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Periodical:

Key Engineering Materials (Volumes 452-453)

Pages:

145-148

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.452-453.145

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Online since:

November 2010

Authors:

Zhen Qing Wang, Zeng Jie Yang, Li Qiang Tang

Keywords:

Constitutive Model, Mixed-Mode Crack, SD Effect, Zirconia Ceramics

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