144 citations · 635 across the 19 of their papers we have counts for
19 papers
Revealing 3-dimensional core-shell interface structures at the single-atom level
Hyesung Jo, Dae Han Wi, Taegu Lee +12
Nanomaterials with core-shell architectures are prominent examples of strain-engineered materials, where material properties can be designed by fine-tuning the misfit strain at the…
Direct observation of three-dimensional atomic structure of twinned metallic nanoparticles and their catalytic properties
Juhyeok Lee, Chaehwa Jeong, Yongsoo Yang
We determined a full 3D atomic structure of a dumbbell-shaped Pt nanoparticle formed by a coalescence of two nanoclusters using deep learning assisted atomic electron tomography. F…
A combined experimental/numerical study on the scaling of impact strength and toughness in composite laminates for ballistic applications
Stefano Signetti, Federico Bosia, Seunghwa Ryu +1
In this paper, the impact behaviour of composite laminates is investigated, and their potential for ballistic protection assessed, as a function of the reinforcing materials and st…
Stress Induced Structural Transformations in Au Nanocrystals
Abhinav Parakh, Sangryun Lee, Mehrdad T. Kiani +5
Nanocrystals can exist in multiply twinned structures like the icosahedron, or single crystalline structures like the cuboctahedron or Wulff-polyhedron. Structural transformation b…
How and When the Cassie-Baxter Droplet Starts to Slide on the Textured Surfaces
Donggyu Kim, Seunghwa Ryu
The Cassie-Baxter state droplet has many local energy minima on the textured surface, while the amount of the energy barrier between them can be affected by the gravity. When the d…
Gravitational effect on the advancing and receding angle of a 2D Cassie-Baxter droplet on a textured surface
Donggyu Kim, Keonwook Kang, Seunghwa Ryu
Advancing and receding angles are physical quantities frequently measured to characterize the wetting properties of a rough surface. Thermodynamically, the advancing and receding a…
Nucleation of Dislocations in 3.9 nm Nanocrystals at High Pressure
Abhinav Parakh, Sangryun Lee, K. Anika Harkins +7
As circuitry approaches single nanometer length scales, it is important to predict the stability of metals at these scales. The behavior of metals at larger scales can be predicted…
Investigation of effective thermoelectric properties of composite with interfacial resistance using micromechanics-based homogenisation
Jiyoung Jung, Sangryun Lee, Byungki Ryu +1
We obtained the analytical expression for the effective thermoelectric properties and dimensionless figure of merit of a composite with interfacial electrical and thermal resistanc…
Applicability of the interface spring model for micromechanical analyses with interfacial imperfections to predict the modified exterior Eshelby tensor and effective modulus
Sangryun Lee, Youngsoo Kim, Jinyeop Lee +1
Closed-form solutions for the modified exterior Eshelby tensor, strain concentration tensor, and effective moduli of particle-reinforced composites are presented when the interfaci…
Phase field modeling of crack propagation under combined shear and tensile loading with hybrid formulation
Heeyeong Jeong, Stefano Signetti, Tong-Seok Han +1
The crack phase field model has been well established and validated for a variety of complex crack propagation patterns within a homogeneous medium under either tensile or shear lo…
Modified Eshelby tensor for an anisotropic matrix with interfacial damage
Sangryun Lee, Jinyeop Lee, Seunghwa Ryu
We derive a simple tensor algebraic expression of the modified Eshelby tensor for a spherical inclusion embedded in an arbitrarily anisotropic matrix in terms of three tensor quant…
The effect of the misfit dislocation on the in-plane shear response of the ferrite/cementite interface
Jaemin Kim, Keonwook Kang, Seunghwa Ryu
Although the pearlitic steel is one of the most extensively studied materials, there are still questions unanswered about the interface in the lamellar structure. In particular, to…
Systematic investigation of the deformation mechanisms of a γ-TiAl single crystal
Byungkwan Jeong, Jaemin Kim, Taegu Lee +2
We propose a theoretical framework to predict the deformation mechanism of the γ-TiAl single crystal without lattice defects by combining the generalized stacking fault energy and…
A micromechanics-based analytical solution for the effective thermal conductivity of composites with orthotropic matrices and interfacial thermal resistance
Sangryun Lee, Jinyeop Lee, Byungki Ryu +1
We obtained an analytical solution for the effective thermal conductivity of composites composed of orthotropic matrices and spherical inhomogeneities with interfacial thermal resi…
Wetting theory for small droplets on textured solid surfaces
Donggyu Kim, Nicola M. Pugno, Seunghwa Ryu
Conventional wetting theories on rough surfaces with Wenzel, Cassie-Baxter, and Penetrate modes suggest the possibility of tuning the contact angle by adjusting the surface texture…
Theoretical study of the effective modulus of a composite considering the orientation distribution of the fillers and the weakened interface
Sangryun Lee, Seunghwa Ryu
In the manufacturing process of a filler-reinforced composite, the fillers in the matrix are aligned due to the shear flow occurring during the drawing stage, and the interface bet…
Molecular dynamics simulation of nanoindentation on nanocomposite pearlite
Hadi Ghaffarian, Ali Karimi Taheri, Seunghwa Ryu +1
We carry out molecular dynamics simulations of nanoindentation to investigate the effect of cementite size and temperature on the deformation behavior of nanocomposite pearlite com…
An analytical benchmark for MD codes: testing LAMMPS on the 2nd generation Brenner potential
Antonino Favata, Andrea Micheletti, Seunghwa Ryu +1
An analytical benchmark is proposed for graphene and carbon nanotubes, that may serve to test whatsoever molecular dynamics code implemented with REBO potentials. By exploiting the…
Entropic Effect on the Rate of Dislocation Nucleation
Seunghwa Ryu, Keonwook Kang, Wei Cai
Dislocation nucleation is essential to our understanding of plastic deformation, ductility and mechanical strength of crystalline materials. Molecular dynamics simulation has playe…