Spherical indentation of copper: Crystal plasticity vs experiment

Cackett, A.; Hardie, Chris; Lim, J. J. H.; Tarleton, Edmund

doi:10.1016/j.mtla.2019.100368

Cited by 23 publications

(11 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…static indentation), shows a rotation field with four lobes, where the zones close to the surface have the same rotation sense to that observed in the experimental indentation rotation (Figure 3(c)). This four-lobed rotation field has been observed for static indentations using a wedge indenter [67] and spherical indentations [68,60]. As the scratch begins to traverse laterally (Figure 7(b)), an additional outer region of counter rotation begins to develop at the surface, whilst the four-lobed indentation rotation zone becomes further confined.…”

Section: Discussionmentioning

confidence: 60%

“…The fitting constants were A = 10 −6 s −1 , B = 0.1 MPa −1 , an obstacle strength term C = 0.05 and D = 2.45 × 10 4 µm −2 . Initial values were taken from [60] and calibrated to match the normal force during the scratch. Consequently plastic deformation induces a dislocation density which hardens the slip systems via an increase in the CRSS, τ c (ρ).…”

Section: Crystal Plasticity Finite Element Modellingmentioning

confidence: 99%

“…The symmetry plane was fixed from translation in the normal direction, x 2 = 0, the nodes on the top surface were traction free, while the remaining four surfaces of the cube were fixed. Elastic anisotropy was used with the following elastic constants for copper: Further details on the UMAT can be found in [60,63,64,65,62,66]. Simulations provide direct comparison with the EF scratch test.…”

Section: Crystal Plasticity Finite Element Modellingmentioning

confidence: 99%

See 2 more Smart Citations

Scratching the Surface: Elastic Rotations Beneath Nanoscratch and Nanoindentation Tests

et al. 2020

View full text Add to dashboard Cite

This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

show abstract

Section: Discussionmentioning

confidence: 60%

Section: Crystal Plasticity Finite Element Modellingmentioning

confidence: 99%

Section: Crystal Plasticity Finite Element Modellingmentioning

confidence: 99%

See 1 more Smart Citation

Scratching the Surface: Elastic Rotations Beneath Nanoscratch and Nanoindentation Tests

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The MD simulations of Varillas et al [38] studied the dislocation interaction, including prismatic loop formation, and identified the formation mechanisms of slip-step and pile-ups in FCC and BCC metals. However, these prismatic loops are not observed by conventional experiments, which have a slow indentation velocity [9,32,[39][40][41].…”

Section: Introductionmentioning

confidence: 88%

Insight into indentation-induced plastic flow in austenitic stainless steel

2020

View full text Add to dashboard Cite

The indentation-induced plasticity and roughness have been investigated intensively by experiments and simulations during the last decades. However, the precise mechanisms of how dislocation flow leads to pileup formation are still not completely understood, although this is one of the initial steps causing surface roughening in tribological contacts at low loads. In this work, f001g-, f101gand f111g-grain orientations in an austenite stainless steel [(face-centered cubic (FCC) phase]) are indented with varying load forces. By using scanning electron-based methods and slip plane analysis, we reveal: (1) how slip-steps show the change of pileup formation, (2) how the slip-plane inclination determines the dislocation flow and (3) how slip-plane interactions result in the final pileup shape during indentation. We find that the flow direction transforms from the forward flow to the sideway at a transition angle of 55 À58 between the slip-plane and the surface. We use large displacement finite element method simulations to validate an inversion of the resolved shear stress at this transition angle. We provide insights into the evolution of plasticity in dislocation-mediated FCC metal indentations, with the potential application of this information for indentation simulations and for understanding the initial stage of scratching during tribology in the future.

show abstract

“…Cu is one of the most widely used metal materials studied in the nanoindentation experiment [15] and simulations [9,10,16,17]. The topic is so broad that any attempt to perform an exhaustive review in the domain may easily overlook some important work in the field.…”

Section: Introductionmentioning

confidence: 99%

A Molecular Dynamics Simulations Study of the Influence of Prestrain on the Pop-In Behavior and Indentation Size Effect in Cu Single Crystals

Song

Leng

et al. 2021

Materials

View full text Add to dashboard Cite

The pop-in effect in nanoindentation of metals represents a major collective dislocation phenomenon that displays sensitivity in the local surface microstructure and residual stresses. To understand the deformation mechanisms behind pop-ins in metals, large scale molecular dynamics simulations are performed to investigate the pop-in behavior and indentation size effect in undeformed and deformed Cu single crystals. Tensile loading, unloading, and reloading simulations are performed to create a series of samples subjected to a broad range of tensile strains with/without pre-existing dislocations. The subsequent nanoindentation simulations are conducted to investigate the coupled effects of prestrain and the presence of resulting dislocations and surface morphology, as well as indenter size effects on the mechanical response in indentation processes. Our work provides detailed insights into the deformation mechanisms and microstructure-property relationships of nanoindentation in the presence of residual stresses and strains.

show abstract

Spherical indentation of copper: Crystal plasticity vs experiment

Cited by 23 publications

References 45 publications

Scratching the Surface: Elastic Rotations Beneath Nanoscratch and Nanoindentation Tests

Scratching the Surface: Elastic Rotations Beneath Nanoscratch and Nanoindentation Tests

Insight into indentation-induced plastic flow in austenitic stainless steel

A Molecular Dynamics Simulations Study of the Influence of Prestrain on the Pop-In Behavior and Indentation Size Effect in Cu Single Crystals

Contact Info

Product

Resources

About