scholarly journals Corrigendum to Modelling of Cavity Nucleation under Creep-fatigue Interaction [Mechanics of Materials 156 (2021) 1–14/103799]

2021 ◽  
pp. 103896
Author(s):  
J.-D. Hu ◽  
F.-Z. Xuan ◽  
C.-J. Liu ◽  
B. Chen
Keyword(s):  
Cavity Nucleation ◽  
Mechanics Of Materials ◽  
Creep Fatigue

scholarly journals Modelling of cavity nucleation under creep-fatigue interaction

2021 ◽  
pp. 103799
Author(s):  
J.-D. Hu ◽  
F.-Z. Xuan ◽  
C.-J. Liu ◽  
B. Chen
Keyword(s):  
Cavity Nucleation ◽  
Creep Fatigue

scholarly journals Modelling of Cavity Nucleation, Early-stage Growth and Sintering in Polycrystal under Creep-fatigue Interaction

2021 ◽  
Author(s):  
J.-D. Hu ◽  
C.-J. Liu ◽  
Fuzhen Xuan ◽  
Bo Chen
Keyword(s):  
Early Stage ◽  
Hold Time ◽  
Fatigue Loading ◽  
Initial Tension ◽  
Stress Variation ◽  
Compression Phase ◽  
Cavity Nucleation ◽  
Sliding Mechanism ◽  
Creep Fatigue ◽  
Variation Rate

A mechanistic based cavitation model that considers nucleation, early-stage growth and sintering under creep-fatigue interaction is proposed. The number density of cavities ρ and their evolution during multi-cycle creep-fatigue loading are predicted. Both the cavity nucleation and early-stage growth rates, controlled by grain boundary (GB) sliding mechanism during the tension phase, are formulised as a function of local normal stress σ. The cavity sintering that occurs during the compression phase is described as a function of σ, but the mechanism switches to the unconstrained GB diffusion. By examining various load waveform parameters, results provide important insights into experimental design of studying the creep-dominated cavitation process under creep-fatigue interaction. First, creep-fatigue test with initial compression will promote higher ρ value compared to that with initial tension, if the unbalanced stress hold time in favour of tension is satisfied. Second, the ρ value does not have a monotonic dependence on either the compressive hold time or stress level, 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.

Characterization of the cavity nucleation factor for life prediction under creep-fatigue interaction

1996 ◽  
Vol 31 (18) ◽  
pp. 4957-4966 ◽  
Author(s):  
Baig Gyu Choi ◽  
Soo Woo Nam ◽  
Young Cheol Yoon ◽  
Joong Jae Kim
Keyword(s):  
Life Prediction ◽  
Cavity Nucleation ◽  
Creep Fatigue

The nucleation of cavities at grain boundaries

1987 ◽  
Vol 45 ◽  
pp. 288-291
Author(s):  
P. J. Goodhew
Keyword(s):  
Surface Tension ◽  
Surface Energy ◽  
Grain Boundaries ◽  
Radiation Damage ◽  
Impurity Concentration ◽  
Driving Force ◽  
Nucleation And Growth ◽  
Phase Boundaries ◽  
Cavity Nucleation ◽  
Spherical Bubble

Cavity nucleation and growth at grain and phase boundaries is of concern because it can lead to failure during creep and can lead to embrittlement as a result of radiation damage. Two major types of cavity are usually distinguished: The term bubble is applied to a cavity which contains gas at a pressure which is at least sufficient to support the surface tension (2g/r for a spherical bubble of radius r and surface energy g). The term void is generally applied to any cavity which contains less gas than this, but is not necessarily empty of gas. A void would therefore tend to shrink in the absence of any imposed driving force for growth, whereas a bubble would be stable or would tend to grow. It is widely considered that cavity nucleation always requires the presence of one or more gas atoms. However since it is extremely difficult to prepare experimental materials with a gas impurity concentration lower than their eventual cavity concentration there is little to be gained by debating this point.

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