Damage and fracture model for eutectic composite ceramics

Yu, Junzhi; Ni, Xinhua; Liu, Xiequan; Fu, Yunwei; Du, Zhihong

doi:10.1007/s10409-018-0801-0

Cited by 4 publications

(1 citation statement)

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“…Based on the triangular symmetry structure of eutectic clusters, the limit stress of the composite ceramics was predicted [9]. Based on the microstructure characteristics of eutectic ceramics containing parallel fibers, a damage fracture model of parallel fiber eutectic composite ceramics was established [10]. These studies lay a foundation for the analysis of the damage and fracture of trigonometrically symmetric eutectic multiphase ceramics.…”

Section: Introductionmentioning

confidence: 99%

Fracture and damage model of composite ceramics

Yu¹,

Cheng²,

Ni³

et al. 2020

Vib. proced.

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It is of great significance to study the damage and fracture mechanism of trigonometrically symmetric eutectic multiphase ceramics with excellent mechanical properties at room temperature and high temperature. According to the microstructure characteristics of inner triangular symmetric eutectic in multiphase ceramics, a two-scale cell model containing triangular symmetric eutectic was established. The fracture stress of cohesive bond in eutectic was calculated by considering the conditions of cohesive bond fracture at interface phase and fiber junction. The damage variable was introduced and combined with cohesive bond fracture stress to establish the microcosmic damage fracture stress model of eutectic Based on the Dugdale Barenblatt model, the damage localization band model is established by introducing the micro damage fracture stress as the residual strength. It is found that with the increase of fiber volume fraction, the strong confinement of interface phase is destroyed, the residual strength decreases and the length of damage localization band increases with the increase of fiber volume fraction. Reducing the damage degree and selecting the appropriate fiber volume content can increase the fracture stress of eutectic, and then reduce the length of damage localization band, increase the threshold value of crack instability propagation, and enhance the material strength.

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Section: Introductionmentioning

confidence: 99%