Modeling of cavity nucleation, early-stage growth, and sintering in polycrystal under creep–fatigue interaction

Jingdong Hu; Changjun Liu; Fuzhen Xuan; Bo Chen

doi:10.1111/ffe.13643

Modeling of cavity nucleation, early-stage growth, and sintering in polycrystal under creep–fatigue interaction

Jingdong Hu, Changjun Liu, Fuzhen Xuan, Bo Chen

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Abstract

A mechanistic-based cavitation model that considers nucleation, early-stage growth, and sintering under creep–fatigue interaction is proposed to predict the number density of cavities ρ. Both the nucleation and early-stage growth rates, controlled by grain boundary (GB) sliding under tension, are formulized as a function of local normal stress σ_n. Cavity sintering that occurs during the compression is governed by the unconstrained GB diffusion depending on the σ_n. Modeling results provide important insights into experimental load-waveform design. First, test with initial compression promotes higher ρ compared to the initial tension, if the unbalanced hold time in favor of tension is satisfied. Second, the ρ value does not have a monotonic dependence on either the compressive hold time or stress, because of their competing effect on nucleation and sintering. Third, the optimum value of stress variation rate exists in terms of obtaining the highest ρ value due to sintering effect.

Original language	English
Pages (from-to)	882-903
Number of pages	22
Journal	Fatigue and Fracture of Engineering Materials and Structures
Volume	45
Issue number	3
Early online date	9 Jan 2022
DOIs	https://doi.org/10.1111/ffe.13643
Publication status	Published - Mar 2022

Bibliographical note

© 2022 The Authors. Fatigue & Fracture of Engineering Materials & Structures published by John Wiley & Sons Ltd.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Funding Information:
Bo Chen acknowledges financial supports by the UK's Engineering and Physical Sciences Research Council, EPSRC Early Career Fellowship Scheme (EP/R043973/1) and East China University of Science and Technology through the Ministry of Education of the People's Republic of China “the 111 Project.” Jingdong Hu is funded partly by China Scholarship Council (CSC) (201906740075) through the PhD Exchange Scheme. Bo Chen extends his sincere gratitude to Prof Shan‐Tung Tu for providing academic mentorship and endless support.

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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Hu_et_al_Modeling_cavity_nucleationFinal published version, 4.75 MBLicence: CC BY

Cite this

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abstract = "A mechanistic-based cavitation model that considers nucleation, early-stage growth, and sintering under creep–fatigue interaction is proposed to predict the number density of cavities ρ. Both the nucleation and early-stage growth rates, controlled by grain boundary (GB) sliding under tension, are formulized as a function of local normal stress σn. Cavity sintering that occurs during the compression is governed by the unconstrained GB diffusion depending on the σn. Modeling results provide important insights into experimental load-waveform design. First, test with initial compression promotes higher ρ compared to the initial tension, if the unbalanced hold time in favor of tension is satisfied. Second, the ρ value does not have a monotonic dependence on either the compressive hold time or stress, because of their competing effect on nucleation and sintering. Third, the optimum value of stress variation rate exists in terms of obtaining the highest ρ value due to sintering effect.",

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Modeling of cavity nucleation, early-stage growth, and sintering in polycrystal under creep–fatigue interaction

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