• KSBB Journal
• /
• 제32권3호
• /
• pp.174-178
• /
• 2017

Fungal mycelium-based composite materials (FMBC) are a new biomaterial to replace the existing composite materials. To compete with lightweight, high-performance composite materials represented by fiber-reinforced plastic (FRP), various physical and chemical properties and functionality must be secured. Especially, the composite materials made by using mycelium of mushroom is called mushroom plastic. Currently, Ecovative, Grado Zero Espace and MycoWorks in USA and Europe are launching new products. Products utilizing FMBC can be launched in the market for construction materials, automobile interior materials and artificial leather substitutes. In spite of this high possibility, mass production using FMBC has not yet been reported. This review introduces the FMBC, a material that can replace existing plastics, inorganic building materials and animal skins in an environmentally and economically viable way, and looks at the possibility of future biomaterials by summarizing recent research contents.

• 한국전기전자재료학회논문지
• /
• 제20권6호
• /
• pp.555-560
• /
• 2007

This paper describes the results of a study on the sealing integrity of polymer housed surge arrester based on the thermal mechanical test. The polymer housed surge arrester employs silicone insulating materials for its housing, instead of the conventional porcelain housing. The polymer housed surge arresters exhibited the highest sealing integrity because it is not air volume between the FRP(fiber reinforced plastics) module and the silicone housing. In accordance, the sealing integrity of station class surge arresters is investigated with moisture ingress test. And, the influence of sealing integrity was evaluated through such as measurement of the deflection, reference voltage, leakage current. In electrical characteristics, reference voltage decreased in the range of $16.45{\sim}16.15\;kV$ with after thermal mechanical test. In contrary, despite the continued moisture ingress, the polymer housed surge arresters exhibited almost the same leakage current value and the resistive leakage current has risen slightly. As a results, It was thought that the polymer housed surge arresters shows good stability with sealing integrity.

• 한국산학기술학회논문지
• /
• 제16권12호
• /
• pp.8447-8454
• /
• 2015

레저 보트 선체의 구조설계규격과 재료는 ISO 12215-5에 규정되어 있으며 선체 전장이 2.5m이상 24m미만이면서 선체재료가 강, 알루미늄, FRP등에 대해서만 적용할 수 있다. 따라서 선체 전장이 2.5m이하이거나 선체 재료가 ISO 12215-5의 규정 재료이외인 레저 보트인 경우 ISO 12215-5의 구조설계규격을 적용시킬 수 없고 ISO 12215-5의 부속서에 규정된 낙하시험만으로 구조 신뢰성을 확보할 수 있다. 그러나 선체낙하시험은 제작된 선체에 대하여 적용하는 것은 가능하나 선체를 구조설계단계에서 적용하는 것은 상당한 설계 및 시험 비용등을 초래하므로 현장 적용성이 떨어진다. 따라서 본 연구에서는 이러한 문제점을 극복하기 위하여 일본 소형 선박 검사 사무 규정 세칙에서 제안하고 있는 선체의 종굽힘강도시험규격을 폴리에틸렌 보트 선체의 구조 설계에 응용하여 ISO 12215-5의 비선급표준재료로 제작된 폴리에틸렌 보트의 종굽힘강도시험규격의 허용 설계 변위 기준을 제안하였다.

• 해양환경안전학회지
• /
• 제22권7호
• /
• pp.876-883
• /
• 2016

본 연구에서는 카누 선체 재료를 탄소섬유복합재료로 선정하였으며, 선형설계는 선박 설계 상용프로그램인 SOLIDWORKS를 이용하여 수행하였다. 카누의 유동해석은 상용프로그램인 STAR-CCM+를 이용하여 자유수면의 파형을 살펴보고 수치해석 결과를 통하여 저항성능을 확인하였다. 그 결과, 흘수가 0.09 m일 경우에 4 m/s 미만의 선속으로, 흘수가 0.24 m인 경우에는 2 m/s 미만으로 운항하면 안전하다고 판단되며, 두 명의 성인이 속도를 내는 데에도 무리가 없음을 확인하였다. 또한, 해석결과를 적용하고 CFRP를 이용하여, 기존의 재료보다 20 % 가볍게 제작된 카누에 대해서도 간략히 소개하였다.

• 대한조선학회논문집
• /
• 제54권4호
• /
• pp.312-320
• /
• 2017

This paper deals with the development of structural test facility for the strength assessment of marine leisure boat built from carbon fiber reinforced plastics (CFRP) materials. The structural test facility consists of test jig, load application and control system, and data acquisition system. Test jig, and load application and control system are designed to accommodate various size and short span to depth ratios of single skin, top-hat stiffened and sandwich constructions in plated structural format such as square and rectangular shapes. A lateral pressure load, typical and important applied load condition to the plates of the hull structure for marine leisure boat, is simulated by employing a number of hydraulic cylinders operated automatically and manually. To examine and operate the structural test facility, five carbon/epoxy based FRP square plates having the test section area of $1m^2$, which are part of CFRP marine leisure boat hull, are prepared and they are subjected to monotonically increasing lateral pressure loads. In the test preparation, considering the symmetry of the plates geometry, various strain gauges and linear variable displacement transformer are used in conjunction with data acquisition system utilizing LabVIEW. From the test observation, the responses of the CFRP hull structure of marine leisure boat are understood by obtaining load to deflection and strain to load curves.

• 한국산업보건학회지
• /
• 제7권2호
• /
• pp.161-170
• /
• 1997

본 연구는 사업장 근로자의 스타이렌 폭로수준과 이에 따른 biological monitoring 농도의 변화를 알기 위하여 시도되었다. 조사대상자는 FRP공장, 함침작업공장, 피막도포작업공장에 종사하는 남자근로자 64명과 여자근로자 44명이며 포집 및 분석기간은 1995년 6월 15일부터 9월 30일까지 였다. 일반적 특성중 연령, 성별, 근무경력, 음주량, 흡연량은 설문지를 이용하였고 신장과 체중은 개인건강기록표를, 스타이렌 환경폭로농도를 알기 위하여는 확산형 포집기를 사용하였으며, 생물학적 감시물질의 폭로수준을 알기 위하여 혈액과 소변을 채취하여 혈중 스타이렌, 요중 mandelic acid(MA)와 phenylglyoxylic acid(PGA)을 분석하였다. 평균폭로농도는 21.0ppm으로 저농도였으며 사업장별로는 선박관련업체가, 작업방법으로는 적층작업이, 작업형태는 주작업에서 가장 높은 폭로를 보였으며 대상자 중 11%가 허용기준 이상으로 폭로되었다. 환경폭로수준과 혈중 스타이렌의 상관성은 0.620이었고 creatinine으로 보정한 phenylglyoxylic acid와는 0.702로 가장 높은 상관성을 보였다. 혈중 스타이렌과 요중 대사산물의 상관관계는 MA+PGA에서 가장 높은 상관성을 보였다. 생물학적 대사산물의 변화를 설명하는 독립변수들 중 환경폭로농도가 가장 중요하였으며 특히 MA와 MA+PGA에서는 성별 역시 중요한 변수였다. 생물학적 대사산물에 대한 독립변수의 설명력은 모두 31% 이상이었으며 그중 혈중 스타이렌은 49.1%로 가장 높았다. 요중 대사산물을 보정여부에 따른 상관성을 본 결과 모두 0.95이상을 보였다. 이상을 종합한 바 스타이렌 취급작업장의 공기중 농도를 측정할 때 확산포집기로도 사용할 수 있으며, 요의 생물학적 지표에서는 비중으로 보정한 경우가 creatinine으로 보정한 것의 대안으로 사용할 수 있고 또한 요중 MA 및 PGA를 이용하여 폭로 근로자의 폭로농도를 예측할 수 있으므로 이를 스타이렌 취급근로자에 적극적인 활용이 필요한 것으로 제시할 수 있다.

• International Journal of Ocean System Engineering
• /
• 제2권3호
• /
• pp.185-194
• /
• 2012

A Macroscopic combination of two or more distinct materials is commonly referred to as a "Composite Material", having been designed mechanically and chemically superior in function and characteristic than its individual constituent materials. Composite materials are used not only for aerospace and military, but also heavily used in boat/ship building and general composite industries which we are seeing increasingly more. Regardless of the various applications for composite materials, the industry is still limited and requires better fabrication technology and methodology in order to expand and grow. An example of this is that the majority of fabrication facilities nearby still use an antiquated wet lay-up process where fabrication still requires manual hand labor in a 3D environment impeding productivity of composite product design advancement. As an expert in the advanced composites field, I have developed fabrication skills with the use of machinery based on my past composite experience. In autumn 2011, the Korea government confirmed to fund my project. It is the development of a composite sanding machine. I began development of this semi-robotic prototype beginning in 2009. It has possibilities of replacing or augmenting the exhaustive and difficult jobs performed by human hands, such as sanding, grinding, blasting, and polishing in most often, very awkward conditions, and is also will boost productivity, improve surface quality, cut abrasive costs, eliminate vibration injuries, and protect workers from exposure to dust and airborne contamination. Ease of control and operation of the equipment in or outside of the sanding room is a key benefit to end-users. It will prove to be much more economical than normal robotics and minimize errors that commonly occur in factories. The key components and their technologies are a 360 degree rotational shoulder and a wrist that is controlled under PLC controller and joystick manual mode. Development on both of the key modules is complete and are now operational. The Korean government fund boosted my development and I expect to complete full scale development no later than 3rd quarter 2012. Even with the advantages of composite materials, there is still the need to repair or to maintain composite products with a higher level of technology. I have learned many composite repair skills on composite airframe since many composite fabrication skills including repair, requires training for non aerospace applications. The wind energy market is now requiring much larger blades in order to generate more electrical energy for wind farms. One single blade is commonly 50 meters or longer now. When a wind blade becomes damaged from external forces, on-site repair is required on the columns even under strong wind and freezing temperature conditions. In order to correctly obtain polymerization, the repair must be performed on the damaged area within a very limited time. The use of pre-impregnated glass fabric and heating silicone pad and a hot bonder acting precise heating control are surely required.