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음의 푸아송비를 갖도록 변환된 와이어 직조 Kagome

A Wire-Woven Kagome Transformed to have a Negative Poisson's Ratio

  • 강대승 (전남대학교 기계공학부) ;
  • 한승철 (전남대학교 기계공학부) ;
  • 박종우 (전남대학교 기계공학부) ;
  • ;
  • 강기주 (전남대학교 기계공학부)
  • Kang, Dae Seung (School of Mechanical Engineering, Chonnam Nat'l Univ.) ;
  • Han, Seung Chul (School of Mechanical Engineering, Chonnam Nat'l Univ.) ;
  • Park, Jong Woo (School of Mechanical Engineering, Chonnam Nat'l Univ.) ;
  • Nguyen, Dang Ban (School of Mechanical Engineering, Chonnam Nat'l Univ.) ;
  • Kang, Kiju (School of Mechanical Engineering, Chonnam Nat'l Univ.)
  • 투고 : 2016.03.30
  • 심사 : 2016.07.11
  • 발행 : 2016.09.01

초록

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 ${\alpha}$-cristobalite 구조적 특성을 모사하여 음의 푸아송비를 갖는 새로운 직조 구조체를 개발하였다. 와이어 직조 Kagome를 제작한 후 사면체 단위셀 부분을 강구와Epoxy를 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 ${\alpha}$-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.

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참고문헌

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