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.
|Number of pages||22|
|Journal||Fatigue and Fracture of Engineering Materials and Structures|
|Early online date||9 Jan 2022|
|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.
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