Multiscale analysis of nanoscale thin film considering surface effects: Thermomechanical properties

Choi, Jinbok; Cho, Maenghyo; Kim, Wonbae

doi:10.2140/jomms.2010.5.161

Cited by 20 publications

(5 citation statements)

References 29 publications

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“…The surface tension between water and the atmosphere is chosen as γ GL = 7.28 × 10 −2 N m −1 . The surface material parameters of the substrate are γ S = 1.0398 N m −1 , surface Lame parameters λ S = 15.6 N m −1 , μ S = −8.6 N m −1 , which are obtained from Choi et al [31]. The only unknown parameter for the interface layer is γ L , which can be obtained based on the target contact angle [11].…”

Section: (A) Validation Of the Surface Tension Effectmentioning

confidence: 99%

On multiscale moving contact line theory

Fan

2015

Proc. R. Soc. A.

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In this paper, a multiscale moving contact line (MMCL) theory is presented and employed to simulate liquid droplet spreading and capillary motion. The proposed MMCL theory combines a coarse-grained adhesive contact model with a fluid interface membrane theory, so that it can couple molecular scale adhesive interaction and surface tension with hydrodynamics of microscale flow. By doing so, the intermolecular force, the van der Waals or double layer force, separates and levitates the liquid droplet from the supporting solid substrate, which avoids the shear stress singularity caused by the noslip condition in conventional hydrodynamics theory of moving contact line. Thus, the MMCL allows the difference of the surface energies and surface stresses to drive droplet spreading naturally. To validate the proposed MMCL theory, we have employed it to simulate droplet spreading over various elastic substrates. The numerical simulation results obtained by using MMCL are in good agreement with the molecular dynamics results reported in the literature.

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Section: (A) Validation Of the Surface Tension Effectmentioning

confidence: 99%

On multiscale moving contact line theory

Fan

2015

Proc. R. Soc. A.

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“…19 The mechanical properties of the bulk material were also predicted by MD simulation for each configuration. Usually, they can be obtained from MD simulation or experiments.…”

Section: Surface Effects On the Dynamic Behavior Of Nanosized Thin Fimentioning

confidence: 99%

“…19 Therefore, the fundamental natural frequency of the NEMS resonator when surface effects were considered was about 30% lower than when surface effects were ignored for the ͑100͒/͓100͔ configuration at 3.1 nm ͑Fig. 19 Therefore, the fundamental natural frequency of the NEMS resonator when surface effects were considered was about 30% lower than when surface effects were ignored for the ͑100͒/͓100͔ configuration at 3.1 nm ͑Fig.…”

Section: Surface Effects On the Dynamic Behavior Of Nanosized Thin Fimentioning

confidence: 99%

Surface effects on the dynamic behavior of nanosized thin film resonator

Choi¹,

Cho²,

Kim³

2010

Appl. Phys. Lett.

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“…Cho et al [2009] suggested a sequential multiscale method in order to determine initial surface stress and surface Lamé constants using a matching method based on a molecular dynamics (MD) simulation. As an extension of this multiscale model, a finite element analysis including thermomechanical properties was carried out by Choi et al [2010a].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2012

J. Mech. Mater. Struct.

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A continuum-based sequential multiscale model is presented for application to nanofilms and nanowires with anisotropic surfaces. The surface effect is accounted for via the inclusion of surface energy due to surface stress and surface strain in the internal energy. For anisotropic surfaces such as a <110> surface, a linear surface elasticity model is used instead of the isotropic surface elasticity model proposed by Gurtin and Murdoch. A molecular dynamics simulation is performed in order to calculate initial surface stress and surface elastic tensor. Equilibrium strain and size-dependent elasticity are estimated by the proposed continuum model. 613 614 WONBAE KIM, SEUNG YUN RHEE AND MAENGHYO CHO MOLECULAR DYNAMICS MODELS FOR THE LINEAR ELASTICITY OF NANOFILMS AND NANOWIRES 617where matrices B m , B b , and B s represent the relationships between nodal displacement and membrane, bending, and transverse shear strains, as follows:The paper studies the dynamic behavior of autoclave aerated concrete (AAC) masonry walls externally strengthened with composite materials and subjected to in-plane dynamic loads. The study combines experimental, analytical and numerical methodologies, presents the results of two types of dynamic tests, and uses them for comparison with a finite element approach that is based on specially tailored high-order finite elements. The first dynamic test focuses on the natural frequencies and vibration modes of the patched wall. The second set of tests focuses on the dynamic response of the wall to in-plane base excitation. The analysis uses the specially tailored finite elements, combines them with conventional elements, and compares the results with the experiments. The discussion supports the validation of the model and throws light on a range of phenomena that characterize the dynamic behavior of the strengthened wall. These phenomena range from the global in-plane to out-of-plane coupling to the localized effects at the strengthened layer level.A compact form for the static Green's function for symmetric loading of an elastic sphere is derived. The expression captures the singularity in closed form using standard functions and quickly convergent series.The ballistic performance of equi-mass plates made from (i) stainless steel (SS); (ii) carbon fibre/epoxy (CF) laminate and (iii) a hybrid plate of both materials has been characterised for a spherical steel projectile. The hybrid plate was orientated with steel on the impact face (SSCF) and on the distal face (CFSS). The penetration velocity (V 50 ) was highest for the SS plate and lowest for the CF plate. A series of double impact tests were performed, with an initial velocity V I and a subsequent velocity V II at the same impact site. An interaction diagram in (V I , V II ) space was constructed to delineate penetration from survival under both impacts. The degree of interaction between the two impact events was greater for the CFSS plate than for the SSCF plate, implying that the distal face has the major effect upon the degree of interacti...

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Multiscale analysis of nanoscale thin film considering surface effects: Thermomechanical properties

Cited by 20 publications

References 29 publications

On multiscale moving contact line theory

On multiscale moving contact line theory

Surface effects on the dynamic behavior of nanosized thin film resonator

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