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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
샌드위치 판재의 굽힘 거동에 미치는 불연속 WBK 심재의 영향
김하라(H.R. Kim),이민근(M.G. Lee),윤종원(J.W. Yoon),한상민(S.M. Han),서용석(Y.S. Suh),강기주(K.J. Kang) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The bending properties of sandwich panels with discontinuous WBK (Wire-woven Bulk Kagome) cores were investigated. Analytic solutions were derived, and the experimental and numerical results were presented. The analytic solutions provided good estimations of the failure mode, peak load, and bending stiffness in comparison with the experimental results. The strength and stiffness of sandwich panels with discontinuous WBK cores under bending load often substantially deteriorated depending on the gap width between the cores and on the detailed geometry near the gap. The analytic solutions successfully explained how the deterioration of the bending strength or stiffness could be minimized, when two separate sandwich panels or cores are to be joined.
한승철(Seung Cheol Han),이민근(M.G.Lee),윤종원(J.W.Yoon),한상민(S.M.Han),서용석(Y.S.Suh),강기주(Ki-Ju Kang) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
A periodic cellular metal (PCM) has both load supporting performance and thermal management properties. A few years ago, a new technique for fabricating PCM, known as Wire-woven Bulk Kagome (WBK), was introduced. The WBK has been proved that it has high strength-per-weight. In this work, the buckling responses of two types of WBKcored sandwich panels subjected to in-plane compression were investigated. For both types, the peak loads were governed by macro plastic buckling. Low shear modulus and strength of the WBK core substantially influenced the buckling behaviors of the sandwich panels before and after their peaks. Classical theories, experimental and numerical results were presented. The effects of several factors were analyzed.