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김원배(Wonbae Kim),유수영(Suyoung Yu),신현성(Hyunseong Shin),조맹효(Maenghyo Cho) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In this work, a study on hyperelastic characteristics of epoxy resin according to cross-link ratio is presented. The epoxy resin is widely used as matrix material of composite laminate or nano composite, so its elastic properties are very important in structural analysis of composite materials. The cross-link ratio of epoxy resin could change elastic properties such as elastic modulus, elastic range, and yield stress. To investigate hyperelastic behavior of epoxy resin according to cross-link ratio, molecular dynamics simulations are performed, and some discussions about hyperelastic modeling using the simulation results are presented.
두 개의 결정립으로 구성된 나노박막의 기계적 거동 해석
김원배(Wonbae Kim),조맹효(Maenghyo Cho) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In this study, molecular dynamics simulation is performed to investigate the mechanical behavior of bi-crystalline nanofilms under uniaxial tensile or simple shear loading. Three bi-crystalline nanofilms with {100} surfaces having different crystal orientation are considered as the simulation models. It is interestingly shown that the maximum stress before starting plastic deformation is nearly same regardless grain orientation.
김원배(Wonbae Kim),조맹효(Maenghyo Cho) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In this paper, elastic properties such as Young’s modulus and Poisson’s ratio of various transition metal nanofilms are calculated for the {100} and {110} surfaces by using molecular dynamics simulation. A new method using 3<SUP>rd</SUP> order elastic constants and least square method is presented for the calculation of elastic constants. We also introduce analytical method of calculating elastic constants for EAM potential and it’s results as the reference value to be compared with the simulation results.
나노박막의 원자적 계산을 위한 Surface relaxation 모델
김원배(Wonbae Kim),조맹효(Maenghyo Cho) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this paper, we present a surface relaxation model in atomistic calculations for thin nanofilms. This surface relaxation model is very simple model which have only two degrees of freedoms to determine the atom positions of nanofilms. Whereas in conventional molecular statics simulations, the same number of degrees of freedoms as all atom positions are used as variables. In order to prove the reliability of presented model, we present the results of self-equilibrium strain calculations with the surface parameters obtained from this model.