Modeling the Effects of Grain and Porosity Structure on Copper Spall Response

Moore, J.; Li, Shiu Fai; Rhee, Min Suk; Barton, Nathan R.

doi:10.1007/s40870-018-0170-6

Cited by 11 publications

(2 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Researchers have recently found that nanocrystalline metals have mechanical and physical properties superior to polycrystalline metals with larger grain sizes [1][2][3]. Especially nanocrystalline metals embedded with twin boundaries (TBs) have attracted more attention due to their excellent properties [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Indentation-induced plastic behavior of nanotwinned CuNi alloy: an atomic simulation

Zhang,

Shi

2024

Modelling Simul. Mater. Sci. Eng.

View full text Add to dashboard Cite

This study uses molecular dynamics simulations to explore the mechanical properties of a nano-twinned copper-nickel alloy through nano-indentations. The effects from twin boundary angle and spacing on the alloy’s behavior are mainly focused on. It is found that the plastic deformation process is primarily driven by dislocation generations, slips, and interactions between dislocations and twin boundaries, all combined affecting the alloy’s hardness. Significant findings include: (1) hardness initially decreases and then increases with twin boundary angle increasing; when the twin boundary spacing is greater than 1.25 nm, hardness can be predicted by using a simple proposed model; (2) dislocation density experiences significant variations, leveling off at an indentation depth around 1.0 nm; (3) when twin boundary spacing exceeds 1.25 nm, plastic deformation is dominated by dislocation nucleation, slips, and interactions with twin boundaries, while smaller spacings lead to twin boundary migration and the presence of independent dislocation loops, giving rise to force fluctuations along indentation process.

show abstract

Section: Introductionmentioning

confidence: 99%

Indentation-induced plastic behavior of nanotwinned CuNi alloy: an atomic simulation

Zhang,

Shi

2024

Modelling Simul. Mater. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…For example, in laser-induced shock, under an average strain rate of 10 7 -10 8 s −1 , spallation takes place in a matter of a few nanoseconds [8]. While there had been work done for understanding the origins of void nucleation in metals [9][10][11][12], only a handful of works investigated the rate of void growth and coalescence as a function of microstructure under shock loading [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The Modified Void Nucleation and Growth Model (MNAG) for Damage Evolution in BCC Ta

2021

View full text Add to dashboard Cite

A void coalescence term was proposed as an addition to the original void nucleation and growth (NAG) model to accurately describe void evolution under dynamic loading. The new model, termed as modified void nucleation and growth model (MNAG model), incorporated analytic equations to explicitly account for the evolution of the void number density and the void volume fraction (damage) during void nucleation, growth, as well as the coalescence stage. The parameters in the MNAG model were fitted to molecular dynamics (MD) shock data for single-crystal and nanocrystalline Ta, and the corresponding nucleation, growth, and coalescence rates were extracted. The results suggested that void nucleation, growth, and coalescence rates were dependent on the orientation as well as grain size. Compared to other models, such as NAG, Cocks–Ashby, Tepla, and Tonks, which were only able to reproduce early or later stage damage evolution, the MNAG model was able to reproduce all stages associated with nucleation, growth, and coalescence. The MNAG model could provide the basis for hydrodynamic simulations to improve the fidelity of the damage nucleation and evolution in 3-D microstructures.

show abstract

A comparison of Gurson and Cocks–Ashby porosity kinetics and degradation functions

Moore

Frasca

2021

Int J Fract

View full text Add to dashboard Cite

Modeling the Effects of Grain and Porosity Structure on Copper Spall Response

Cited by 11 publications

References 74 publications

Indentation-induced plastic behavior of nanotwinned CuNi alloy: an atomic simulation

Indentation-induced plastic behavior of nanotwinned CuNi alloy: an atomic simulation

The Modified Void Nucleation and Growth Model (MNAG) for Damage Evolution in BCC Ta

A comparison of Gurson and Cocks–Ashby porosity kinetics and degradation functions

Contact Info

Product

Resources

About