Modeling of cavity nucleation, early‐stage growth, and sintering in polycrystal under creep–fatigue interaction
Modeling of cavity nucleation, early‐stage growth, and sintering in polycrystal under creep–fatigue interaction
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.
882-903
Hu, Jingdong
a95b884c-cf9e-46d2-80b2-f1084f92ee0f
Liu, Changjun
7ee2cd22-b5bf-4390-baf9-d5a0aa90cd72
Xuan, Fuzhen
06f2c301-b6c2-4a0e-b22b-5119dfa0f14c
Chen, Bo
be54a9a8-da2a-4e6f-ae0e-0b076be87daf
8 February 2022
Hu, Jingdong
a95b884c-cf9e-46d2-80b2-f1084f92ee0f
Liu, Changjun
7ee2cd22-b5bf-4390-baf9-d5a0aa90cd72
Xuan, Fuzhen
06f2c301-b6c2-4a0e-b22b-5119dfa0f14c
Chen, Bo
be54a9a8-da2a-4e6f-ae0e-0b076be87daf
Hu, Jingdong, Liu, Changjun, Xuan, Fuzhen and Chen, Bo
(2022)
Modeling of cavity nucleation, early‐stage growth, and sintering in polycrystal under creep–fatigue interaction.
Fatigue & Fracture of Engineering Materials & Structures, 45 (3), .
(doi:10.1111/ffe.13643).
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.
Text
Fatigue Fract Eng Mat Struct - 2022 - Hu - Modeling of cavity nucleation early‐stage growth and sintering in polycrystal
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Accepted/In Press date: 22 December 2021
e-pub ahead of print date: 9 January 2022
Published date: 8 February 2022
Identifiers
Local EPrints ID: 489844
URI: http://eprints.soton.ac.uk/id/eprint/489844
ISSN: 8756-758X
PURE UUID: 0050ec09-4190-4c21-8c7a-1286159f02f5
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Date deposited: 03 May 2024 16:34
Last modified: 04 May 2024 02:09
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Author:
Jingdong Hu
Author:
Changjun Liu
Author:
Fuzhen Xuan
Author:
Bo Chen
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