Jung‐Wuk Hong
Korea Advanced Institute of Science and Technology 건설환경공학부 · 工学
홍정욱 교수의 연구실은 메커니컬 스트레인에 의해 광학적 성질이 변화하는 스마트 재료, 특히 기계적 변형에 반응하는 고대비 광학 조절 기능을 가진 나노복합막 및 필름의 설계와 응용을 핵심으로 합니다. 특히, 유연성과 투명도를 동시에 확보한 메카노크로믹 스마트 윈도우 및 인공피부, 위장 기술에 응용 가능한 3D 나노복합 구조를 개발하고 있으며, 이는 고성능 광학 소재의 설계 원리와 제조 공정을 동시에 고려한 통합적 접근을 취합니다. 유한요소해석 및 페리다이내미크스 기반 수치해석을 통해 재료 거동을 정량적으로 분석함으로써, 실용화 가능한 스마트 소재의 설계 기반을 마련하고 있습니다.
Figures are computed from collected data and may differ slightly.
SUMMARY Peridynamics is a theory of continuum mechanics expressed in forms of integral equations rather than partial differential equations. In this paper, a peridynamics code is implemented using a graphics processing unit for highly parallel computation, and numerical studies are conducted to investigate the responses of brittle and ductile material models. Stress–strain behavior with different grid sizes and horizons is studied for a brittle material model. A comparison of stresses and strain
The realization of high-contrast modulation in optically transparent media is of great significance for emerging mechano-responsive smart windows. However, no study has provided fundamental strategies for maximizing light scattering during mechanical deformations. Here, a new type of 3D nanocomposite film consisting of an ultrathin (≈60 nm) Al<sub>2</sub>O<sub>3</sub> nanoshell inserted between the elastomers in a periodic 3D nanonetwork is proposed. Regardless of the stretching direction, numer
The low-velocity impact responses of cross-ply CFRP composite plates are investigated experimentally and are simulated using the finite element code LS-DYNA. An experimental test was initially performed and two different modeling approaches were then employed to model the composite plates. In the first numerical modeling approach, solid elements are utilized for the composite layers, whereas in the second, shell elements are used. The numerical model using the shell elements shows a good correla
Mechanochromic smart membranes capable of optical modulation have great potential in smart windows, artificial skins, and camouflage. However, the realization of high-contrast optical modulation based on light scattering activated at a low strain remains challenging. Here, we present a strategy for designing mechanochromic scattering membranes by introducing a Young's modulus mismatch between the two interdigitated polydimethylsiloxane phases with weak interfaces in a periodic three-dimensional
The cost-effective direct writing of polymer nanofibers (NFs) has garnered considerable research attention as a compelling one-pot strategy for obtaining key building blocks of electrochemical and optical devices. Among the promising applications, the changes in optical response from external stimuli such as mechanical deformation and changes in the thermal environment are of great significance for emerging applications in smart windows, privacy protection, aesthetics, artificial skin, and camou
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