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음의 푸아송비를 갖도록 변환된 와이어 직조 Kagome
강대승(Dae Seung Kang),한승철(Seung Chul Han),박종우(Jong Woo Park),Nguyen Dang Ban,강기주(Kiju Kang) 대한기계학회 2016 大韓機械學會論文集A Vol.40 No.9
와이어 직조 Kagome는 와이어로 직조된 Periodic Cellular Metal의 일종으로서 Kagome 구조로 이루어져 있다. 와이어 직조 Kagome는 무게 대비 높은 강도와 강성을 가지면서 대량 생산에도 큰 가능성을 가지는 것으로 알려졌다. 본 연구에서는 α-cristobalite 구조적 특성을 모사하여 음의 푸아송비를 갖는 새로운 직조 구조체를 개발하였다. 와이어 직조 Kagome를 제작한 후 사면체 단위셀 부분을 강구와 Epoxy를 이용하여 채우고, 초기 변형을 주어 시편을 제작하였다. 또한 FEA 시뮬레이션을 통해 제작 가능성을 확인하고, 실제 제작한 구조체를 대상으로 기계적 특성을 연구하였다. Wire-woven Kagome is a kind of Periodic Cellular Metal, which is known to have high strength, stiffness for its weight, and potential for mass production. In this work, we developed a new structure that mimics α-cristobalite. First, an ordinary wire-woven Kagome was fabricated using metallic wires, and the tetrahedral cells were then filled with metal balls and epoxy. The wire-woven Kagome was transformed to have a negative Poisson’s ratio by carrying out a specified amount of initial deformation. The fabrication possibility and kinematic behavior were checked by using FEA simulation. Finally, the mechanical properties were measured using compressive tests.
강대승(Dae Seung Kang),이민근(M.G.Lee),강기주(Ki-Ju Kang) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Many studies have been conducted for Periodic Cellular Metals(PCMs) to obtain high strength and stiffness for a given weight. To date, a number of structures have been proposed, and they mostly have truss structures such as Pyramid, Octet, Kagome, etc. Recently, Microlattice, a ultra-low density metal(ULDM) composed of hollow trusses was introduced. Microlattice is fabricated based on 3D-lithography technology, which costs very high. In our laboratory, several types of wire-woven structures have been developed as the alternatives of truss PCMs with multiple layers and fine cells. Based on the wire-weaving technology, we introduced a new ultra-low density metal. First, a truss-like structure is assembled using flexible polymer wires. Then, the surface is coated using electroless plating. Finally, the polymer wires are etched out to obtain a hollow tubular structure, micro tube WBK-Q. In this work, we investigate the mechanical properties of the micro tube WBK-Q using FEA