Structural Mechanisms of Fracture of Nanocrystalline Materials

Pozdnyakov, V. A.; Глезер, А. М.

doi:10.1134/1.1924838

Cited by 22 publications

(13 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In polycrystalline materials, the contribution of GB junction to the fracture energy is very negligible and is ignored during fracture analysis [7]. The volume fraction in a material consists of GBs and triple junctions and it increases as the grain size decreases.…”

Section: Theoretical Consideration: Choice Of Model Equations and Jusmentioning

confidence: 99%

“…The condition of initiation of trans and intercrystallite fracture are given by the relation between the cohesion ( 0 γ ) and grain boundary fracture energies ( e γ ) [7] given as …”

Section: Theoretical Consideration: Choice Of Model Equations and Jusmentioning

confidence: 99%

“…It is therefore important to study how crack propagation affects material properties using the Griffith crack size. The induced crack size at the edge of a deformed materials can be represented by the Griffiths crack size [7] given by γ is the crack effective fracture energy in nc materials and E is the young's modulus [9]. The expression of young's modulus E of nanomaterials is obtained from [9] …”

Section: Theoretical Consideration: Choice Of Model Equations and Jusmentioning

confidence: 99%

“…The griffith crack theory conditions from empirical data states [7], the Griffith crack theory is used for homogeneous continuum materials. The Griffith crack size can greatly exceed the nanomaterials' grain size of (approximately 10 nm)…”

Section: Theoretical Consideration: Choice Of Model Equations and Jusmentioning

confidence: 99%

“…The main reasons why material properties are studied are to prevent material failure during usage [7]. A crack in a material is an indication that the produced material might eventually fail during usagesince cracks which have negative impacts on nc materials mechanical properties [7].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Cracks Propagation as a Function of Grain Size Variants on Nanocrystalline Materials’ Yield Stress Produced by Accumulative Roll-Bonding

Sob¹,

Alugongo²,

Tengen³

2017

AMPC

View full text Add to dashboard Cite

Cracks are usually observed at the edge of materials deformed by accumulative roll bonding from conventional materials to nanostructure materials. The observed cracks then propagate in the materials during grain refinement. The cracks propagation affects the yield stress and the effective fracture energy of nanocrystalline materials. In this study, the impacts of crack propagation when measured as a function of grain size variants on nanocrystalline materials' yield stress are investigated for a material deformed by accumulative roll-bonding. The study employs experimental data and theoretical concepts of severe plastic deformation and cracks processes in nanocrystalline materials. The current studies also focus on nano-cracks that will not lead to rapid materials failure during grain refinement. The study revealed that crack propagation varied as a function of grain size variants during grain refinement. The study also revealed that nano-crack increased during the deformation of nanostructured materials. The study also revealed that the effective fracture energy decreased as grain refinement took place. The study revealed that nanomaterials yield stress decreased with the increase in effective fracture energy. The current study suggests a theoretical model that shows the generation of nanomaterials cracks during grain refinement as a function of grain size variants. In the model, the cracks propagate on nanocrystalline materials due to the compressive load applied to a material. The model predicts that the generation of cracks as functions of grain size variants impacts the energy level in nanocrystalline materials.

show abstract

Section: Theoretical Consideration: Choice Of Model Equations and Jusmentioning

confidence: 99%

“…The condition of initiation of trans and intercrystallite fracture are given by the relation between the cohesion ( 0 γ ) and grain boundary fracture energies ( e γ ) [7] given as …”

Section: Theoretical Consideration: Choice Of Model Equations and Jusmentioning

confidence: 99%

Section: Theoretical Consideration: Choice Of Model Equations and Jusmentioning

confidence: 99%

Section: Theoretical Consideration: Choice Of Model Equations and Jusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations