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Damage and fracture model for eutectic composite ceramics

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Abstract

Study of damage and fracture models to analyze the fracture mechanism of eutectic composite ceramics is of considerable importance because no accurate fracture models are available for these materials. Eutectic composite ceramics are composed of microcells with random direction. We present herein a model that predicts the damage and fracture of eutectic composite ceramics based on analysis of defect stability and the damage localization band. Firstly, given the microstructure of eutectic composite ceramics, a mesodomain and a microcell model are constructed. The local stress field in the mesodomain is then analyzed based on the interaction direct derivative estimate. Secondly, the stability of a defect around particles in a microcell is analyzed, and the stress intensity factor of an annular defect under the applied stress field and the residual stress field in the particle are calculated. The stress intensity factor of a defect is controlled by the residual stress when the defect extension is small. However, it is controlled by the applied stress when the defect extension is large. Finally, a model for the damage localization band at the crack tip is constructed based on the Dugdale–Barenblatt model. The residual intensity is the important factor affecting the length of the damage localization band. When the damage variables reach their largest value, the residual intensity and the length of the damage localization band attain their minimum value. This work provides the theoretical basis for further study of the damage mechanics of eutectic composite ceramics and guides the engineering applications of these materials.

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Acknowledgement

This work was supported by the National Natural Science Foundation of China (Grant 11272355).

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Authors and Affiliations

  1. Department of Vehicle and Electric Engineering, Army Engineering University, Shijiazhuang, 050003, China

    Jinfeng Yu & Zhihong Du

  2. Army Infantry College, Nanchang, 330000, China

    Xinhua Ni & Xiequan Liu

  3. Xichang Satellite Launch Center, Xichang, 615000, China

    Yunwei Fu

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  1. Jinfeng Yu
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  2. Xinhua Ni
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  3. Xiequan Liu
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  4. Yunwei Fu
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  5. Zhihong Du
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Correspondence to Xinhua Ni.

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Yu, J., Ni, X., Liu, X. et al. Damage and fracture model for eutectic composite ceramics. Acta Mech. Sin. 35, 190–200 (2019). https://doi.org/10.1007/s10409-018-0801-0

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  • DOI: https://doi.org/10.1007/s10409-018-0801-0

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