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Finite element analysis of micromechanical failure modes in a heterogeneous ceramic material system

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Abstract

A micromechanical model that provides explicit accounts for arbitrary microstructures and arbitrary fracture patterns is developed and used. The approach uses both a constitutive law for the bulk solid constituents and a constitutive law for fracture surfaces. The model is based on a cohesive surface formulation of Xu and Needleman and represents a phenomenological characterization for atomic forces on potential crack/microcrack surfaces. This framework of analysis does not require the use of continuum fracture criteria which assume, for example, the existence of K-fields. Numerical analyses carried out concern failure in the forms of crack propagation and microcrack formation. Actual microstructures of brittle alumina/titanium diboride (Al2O3/TiB2) composites are used. The results demonstrate the effects of microstructure and material inhomogeneities on the selection of failure modes in this material system. For example, the strength of interfaces between the phases is found to significantly influence the failure characteristics. When weak interfacial strength exists, interfacial debonding and microcrack initiation and growth are the principal mode of failure. When strong interfacial strength is derived from material processing, advancement of a dominant crack and crack branching are observed.

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Authors and Affiliations

  1. The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, USA

    J. Zhai & M. Zhou

  2. Atlanta, GA, 30332-0405

    J. Zhai & M. Zhou

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  1. J. Zhai
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  2. M. Zhou
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Zhai, J., Zhou, M. Finite element analysis of micromechanical failure modes in a heterogeneous ceramic material system. International Journal of Fracture 101, 161–180 (2000). https://doi.org/10.1023/A:1007545105723

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