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전복껍질 메소절편 기반 복합소재 합판 제작 및 이를 이용한 하이브리드 판재의 방탄특성
김정우,강대원,백종규,육영기,박정호,신상모,Kim, Jeoung Woo,Kang, Dae Won,Paik, Jong Gyu,Youk, Youngki,Park, Jeong Ho,Shin, Sang-Mo 한국재료학회 2019 한국재료학회지 Vol.29 No.1
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 258.3 MPa. The bend strength and modulus of the composite plate decrease according to the plate thickness and are about 149.2 MPa and 50.3 GPa, respectively, for a 4.85 mm thick plate. The hybrid armor system with a planar density of $45.2kg/m^2$, 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.
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서칠원,이종구,태원석,김건인,조맹효 한국항공우주학회 2011 한국항공우주학회 학술발표회 논문집 Vol.2011 No.11
최근 군사용 차량의 생존성과 기동성 향상을 위해 기존 RHA강을 대체하는 Hybrid plate가 주목을 받고 있다. 본 연구에서는 AP 소총탄을 방호하기 위해 세라믹, 마그네슘 합금 및 초고분자량 폴리에틸렌 복합재를 적층하는 Hybrid plate를 제안한다. 제안된 모델의 방탄성능을 확인하기 위해 유한요소 범용 프로그램인 AUTODYN을 활용하여 전산모사를 수행했으며, 전산 모사의 신뢰성을 확인하기 위해 실제 실험과 비교 검증하여 관통여부와 형상이 모두 유사함을 확인했다. 또한 전산모사를 통해 제안된 모델이 AP 소총탄에 대해 방호가 가능함을 확인함에 따라 제안된 Hybrid plate 모델을 차량 방탄장갑에 적용시 군사용 차량의 경량화와 방탄 성능을 높일 수 있을 것으로 판단된다. Recently, the hybrid plate has replaced the existing RHA steel in order to improve the survival and the mobility of military vehicle. In this study, hybrid plate consists of ceramics, magnesium alloys, and ultra high molecular weight polyethylene composites. The configuration of the hybrid plate is proposed to prohibit the rifle bullet penetration. To confirm ballistic performance of the proposed model, simulations are performed using AUTODYN program. We compare the results of simulation with those of experiment to confirm the shape of penetration. Moreover, by verifying that the proposed model endures AP bullet penetration, it is shown that it can enhance bulletproof performance and light weight of military vehicle by applying the proposed hybrid model.
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균질 압연 장갑강 용접부의 방탄 성능 및 기계적 물적 상관관계 연구
오민철,김용,김재성 국방기술품질원 2022 국방품질연구논집 Vol.4 No.2
Vehicles, self-propelled guns, wheeled armored vehicles, etc. are manufactured by welding using homogeneous rolled armored steel (MIL-STD-12560) and high hardness armored steel (MIL-STD-46100). In order to verify the performance of the welded part, 'H'-shaped specimens are produced and then bulletproof tests are conducted, and the testing institutes are limited to some overseas testing institutes including the United States. In addition, it is an expensive test that requires at least 55,000 $/time including production cost. In addition, as only corporations in the United States can apply for and proceed with the bulletproof test, there is a problem that, in reality, domestic research institutes and corporations cannot test. In particular, when the low-temperature impact test, which is a general industry standard, is applied to evaluate the bulletproof performance of homogeneous rolled armored steel plates, the possibility of replacing the domestic H plate bulletproof test is expected to increase. Therefore, in this study, a basic study was conducted on the correlation between low-temperature impact toughness and hardness analysis results and bulletproof performance as a way to reduce cost/time and facilitate product supply and demand by replacing the existing H-plate bulletproof test.
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