Nacre of abalone shell features a “brick-and-mortar” microstructure, in which micro-plates of calcium carbonate are bonded by nanometers-thick layers of chitin and proteins. Due to the microstructure and its unique toughening mechanisms, nacre possesses an excellent combination of specific strength, stiffness and toughness. This study deals with the possibility of using nacre fragments obtained from abalone shell for making a bulletproof armor system. A composite plate laminated with abalone shell fragments is made and compression and bend tests are carried out. In addition, a bulletproof test is performed with hybrid armor systems which are composed of an alumina plate, a composite plate, and aramid woven fabric to verify the ballistic performance of nacre. The compressive strength of the composite plate is around 258.3MPa. The bend strength and modulus of the composite plate decrease according to the plate thickness and are about 149.2MPa and 50.3 GPa, respectively, for a 4.85 mm thick plate. The hybrid armor system with a planar density of 45.2 kg/m2, which is composed of an 8 mm thick alumina plate, a 2.4 mm thick composite plate, and 18 layers of aramid woven fabric, satisfy the NIJ Standard 0101.06 : 2008 Armor Type IV. These results show that a composite plate laminated with abalone shell fragments can be used for a bulletproof armor system as an interlayer between ceramic and fabric to decrease the armor system’s weight.

Abstract
 1. 서 론
 2. 실험 방법
  2.1 전복껍질 메소절편 기반 복합소재 합판 제작
  2.2 방탄시험 시편 제작 및 방탄시험
 3. 결과 및 고찰
  3.1 전복껍질 메소절편 기반 복합소재 합판의 미세조직
  3.2 전복껍질 메소절편 기반 복합소재 합판의 압축시험 및 굽힘시험 특성
  3.3 전복껍질 메소절편 기반 복합소재 합판을 포함하는 하이브리드 판재의 방탄특성
 4. 결 론
 References

• 김정우(한밭대학교 생명현상융합연구센터) | Jeoung Woo Kim (Center for Applied Life Science, Hanbat National University) Corresponding author
• 강대원(한밭대학교 생명현상융합연구센터) | Dae Won Kang (Center for Applied Life Science, Hanbat National University)
• 백종규(국방과학연구소) | Jong Gyu Paik (Agency for Defense Development)
• 육영기(미리자개) | Youngki Youk (Mirijagae Co.)
• 박정호(한밭대학교 화학생명공학과) | Jeong Ho Park (Department of Chemical and Biological Engineering, Hanbat National University)
• 신상모(한밭대학교 생명현상융합연구센터, 한밭대학교 창의융합학과) | Sang-Mo Shin (Center for Applied Life Science, Hanbat National University, Department of Creative Convergence Engineering, Hanbat National University)