Thermo-coupled Surface Cauchy–Born theory: An engineering finite element approach to modeling of nanowire thermomechanical response

Esfahani, Mohammad Nasr; Sonne, Mads Rostgaard; Hattel, Jesper Henri; Alaca, B. Erdem

doi:10.1016/j.mechmat.2015.11.011

Cited by 11 publications

(5 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the pore shape effect needs to be considered on the scaling law formulation. The size dependence mechanical behaviour of np Au is modelled through theoretical studies [33,34], while multiscale modelling approaches can be developed to implement the surface energy into the mechanical analysis at finite temperature [48].…”

Section: Pore Shapementioning

confidence: 99%

Molecular Dynamics Simulations of Deformation Mechanisms in the Mechanical Response of Nanoporous Gold

Esfahani

Jabbari

2020

Materials

Self Cite

View full text Add to dashboard Cite

The mechanical behaviour of nanoporous gold has so far been the subject of studies for bicontinuous morphologies, while the load transfer between ligaments is the primary challenge for using nanoporous structures—especially membranes with nanopores—in single-molecule sensors. This work studies the pore shape effect on deformation mechanisms of nanoporous gold membranes through molecular dynamics simulations. Tension and compression tests are carried out for nanoporous gold with circular, elliptical, square and hexagonal pore shapes. A significant pore shape effect on the mechanical properties is observed with distinct load transfer capabilities. A uniform stress transfer between ligaments constitutes a distinguished set of mechanical responses for structures with the hexagonal pore shape under tension, while a unique stress distribution in nanoporous with the circular pore shape introduces a high strength and ductile structure under compression. Further to shed light on the existing experimental observations, this work provides a comprehensive study on load transfer capabilities in the mechanical behaviour of nanoporous gold for sensing applications.

show abstract

Section: Pore Shapementioning

confidence: 99%

Molecular Dynamics Simulations of Deformation Mechanisms in the Mechanical Response of Nanoporous Gold

Esfahani

Jabbari

2020

Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Although the surface stress effect on the mechanical properties of Si nanostructures is studied [38], the influence of surface energy on the mechanical behaviour of np-structures necessitate further investigations. Multiscale modelling approaches need to be developed to implement the surface energy into the mechanical analysis of np-materials similar to other nanostructures [38,56].…”

Section: Resultsmentioning

confidence: 99%

“…Although similar enhancement of the tensile strength and toughness is reported for np-AAO [15] and carbon nanotubes [48] with honeycomb architectures, a series of measurement provides further insight into the mechanical behaviour of np-Si. While the surface stress effect on the mechanical behaviour of np-structures is studied through atomic simulations, multiscale modelling approaches can be developed to include the surface energy into the mechanical analysis of np-materials [38,56]…”

Section: Discussionmentioning

confidence: 99%

Mechanical properties of honeycomb nanoporous silicon: a high strength and ductile structure

Esfahani

Alaca

Jabbari³

2019

Nanotechnology

Self Cite

View full text Add to dashboard Cite

There are remarkable studies geared towards developing mechanical analysis of nanoporous structures, while the size effect has been a major concern so far to improve strength or deformability. In this study, molecular dynamics simulations are utilized to study the pore shape effect on the mechanical behaviour of nanoporous silicon with circular, elliptical, square and hexagonal pore shapes. The influence of pore configuration on load transfer capabilities is studied for nanoporous silicon. A distinguished set of mechanical properties is observed on silicon with a hexagonal pore shape—resembling a honeycomb structure—with a high tensile strength and toughness. The study exhibits an improvement in the ductility through unique stress transformation in the hexagonal pore shape. In addition to the relative density, the potential to control the mechanical properties is demonstrated through the hexagon angle. Finally, a scaling law is developed for the mechanical behaviour of honeycomb nanoporous silicon. In addition to their outstanding mechanical properties, the work provides further insight into the capability of nanoporous structures in sensing applications due to their high surface-to-volume ratios.

show abstract

“…146 (2) The material behaviour is non-linear and is for the polymer material described by a viscoelastic-viscoplastic constitutive behaviour. 147,148 (3) With respect to the contact conditions, changes in frictional behaviour on the different length scales (macroscale to nanoscale) have to be taken into account [149][150][151][152] and add yet another nonlinearity to the system of equations that have to be solved. Here, multiscale modelling is an approach where the global and local conditions can be taken into account in the same model.…”

Section: Modelling the Deformation Process Of Flexible Stamps For Nilmentioning

confidence: 99%

Multiphysics modelling of manufacturing processes: A review

Jabbari

Baran

Mohanty³

et al. 2018

Advances in Mechanical Engineering

View full text Add to dashboard Cite

Numerical modelling is increasingly supporting the analysis and optimization of manufacturing processes in the production industry. Even if being mostly applied to multistep processes, single process steps may be so complex by nature that the needed models to describe them must include multiphysics. On the other hand, processes which inherently may seem multiphysical by nature might sometimes be modelled by considerably simpler models if the problem at hand can be somehow adequately simplified. In the present article, examples of this will be presented. The cases are chosen with the aim of showing the diversity in the field of modelling of manufacturing processes as regards process, materials, generic disciplines as well as length scales: (1) modelling of tape casting for thin ceramic layers, (2) modelling the flow of polymers in extrusion, (3) modelling the deformation process of flexible stamps for nanoimprint lithography, (4) modelling manufacturing of composite parts and (5) modelling the selective laser melting process. For all five examples, the emphasis is on modelling results as well as describing the models in brief mathematical details. Alongside with relevant references to the original work, proper comparison with experiments is given in some examples for model validation.

show abstract

Thermo-coupled Surface Cauchy–Born theory: An engineering finite element approach to modeling of nanowire thermomechanical response

Cited by 11 publications

References 43 publications

Molecular Dynamics Simulations of Deformation Mechanisms in the Mechanical Response of Nanoporous Gold

Molecular Dynamics Simulations of Deformation Mechanisms in the Mechanical Response of Nanoporous Gold

Mechanical properties of honeycomb nanoporous silicon: a high strength and ductile structure

Multiphysics modelling of manufacturing processes: A review

Contact Info

Product

Resources

About