• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.26 no.4
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• pp.430-435
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• 2017

The effect of the surface profile on CFRP and aluminum metal bonding was studied. A small number of steps were made on the aluminum surface, and the shear stress and elongation were measured using a shear test after bonding with an autoclave method. As the number of surface steps increased, the shear stress and elongation increased. The surface bonding strength increased because of the effect of the mechanical and chemical bonding. When the number of effective stages was exceeded, the shear strength decreased again due to the aspect ratio of the step and the reduction of the penetration effect of the resin into the groove.

• Journal of Ocean Engineering and Technology
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• v.24 no.1
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• pp.146-152
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• 2010

Recently, the applied frequency of composite materials was increased from the viewpoint of lightweight, high strength and low cost when a leisure boat and a fishing boatwere built. However, studies on the mechanical properties of composite material with ship are rare. Specially, a leisure boat and fishing boat with FRP had been built by hand lay-up method. However, the vacuum infusion method is rising recently for ship building. The manufactured these FRP plates were combined by using the adhesive. Therefore, in this study Cleavage peel strength, Shear strength and fatigue limit of adhesive bonds by tensileloading were estimated. From test results, the strengths of FRP specimens made by the vacuum infusion method are higher than that of the hand lay-up method.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.1764-1767
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• 2003

It is widely used in composite materials like several mechanical parts. aerospace industries. internal and structural materials of cars, building structures. ship materials and sporting goods. but it is insufficient to apply in field of mechanical processing. Therefore. GFRP which is possible to use in industrial field was examined about cutting force. tool wear condition of cutting, chip shape. surface roughness and inlet or outlet shape of processing parts with changing cutting condition and using HSS drill which is in vertical machining center in this paper.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.19 no.2
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• pp.75-80
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• 2020

In this study, we designed car frames for collision analysis using carbon fiber reinforced polymer (CFRP) as the lighter composite material. The impact conditions were 100 percent frontal impact, 40 percent frontal impact, and 90 degrees side impact. The impact analysis measured the maximum stress at velocities of 20km/h and 40km/h for each condition and evaluated the vulnerable points in the car frame. Additional supports have been designed both to improve the weak points in existing vehicle frames, and to be taken into account when new parts are assembled. Our impact analysis compared the results of maximum stress on the car frame with and without the support.

• Design & Manufacturing
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• v.10 no.3
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• pp.39-45
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• 2016

The purpose of this study is to build effective cooling circuit design in injection mold to improve glass fiber reinforced laptop computer cover plastics' transcription and gloss. Moldflow Insight and Ansys CFD CAE program used to verify efficiency and the experiment mold is precision machined and brazing soldered to make three-dimension cooling channel. The temperature of mold in injection test are fixed to $80^{\circ}C$ and $160^{\circ}C$. The result of this experiment is the improved surface quality of plastics with 85% improvement of transcription in high temperature mold.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1999.03b
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• pp.136-142
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• 1999

The injection molded part shrinks in the process of solidification by the amount of the coefficient of linear thermal expansion multiplied by the temperature difference between the coefficient of linear thermal expansion multiplied by the temperature difference between the room temperature and the temperature at which the solid structure is formed in the mold And it is called warpage for this type of deformation that shrinkage are not uniform throughout the injection molded part. To predict warpage phenomena in the articles the results obtained theoretically from the change of mold temperature fiber content of composites have been compared with exsperimental results.

• Proceedings of the Korea Concrete Institute Conference
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• 2003.05a
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• pp.822-827
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• 2003

This study was performed to evaluate the internal and external factors affecting external strength of the 3-layer polymer composite pipes made of polymer mortar and fiber-glass reinforced plastic. Twenty four sandwich type 3-layer polymer composite pipes were made of polymer mortar and fiber-glass reinforced plastic by centrifugal method. The objective of this study was to evaluate the effects the of polymer mortar thickness for and core fiber-glass contents per unit area on external strength of 3-layer polymer composite pipes. For the more economical and practical design of 3-layer polymer composite pipe, further study should be done for the various polymer mortar, fiber-glass and different ratio of the inside/outside FRP thickness.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.2 no.2
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• pp.37-44
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• 2003

Composite materials are widely used to make all kinds of machine parts, internal and structural materials of cars, aerospace industries, building structures, ship materials, sporting goods and others. It is worth the while to use composite materials as various substitutions when compared With others. But the use is limited in the field of the mechanical processing because of its difficulties in cutting. The surface roughness of in and out in the hole processing was discussed after cutting the GFRP with HSS drill in the vertical machining center. And it is observed that as it processed more, the powdered chip may be got more than the fluid type long chip.

• Journal of the korean Society of Automotive Engineers
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• v.10 no.1
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• pp.33-41
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• 1988

A turning (facing) test on Glass Fiber Reinforced Plastics was performed with several tool materials, e.g., cemented carbides, cermet and ceramic, and the wear patterns and wear rate were analyzed to clarify the relation between physical(mechanical) properties and flank wear of cutting tool. The main results are obtained as follows: (1) When cutting speed is increased, the flank wear in every tool material grows the abnormal wear in the shape of triangle at a certain speed, i.e., a critical speed. (2) When cutting speed is increased, the wear rate in experimental tool material starts to increase remarkably at a critical speed. (3) The thermal conductivity among the properties of the tool material and the thermal crack coefficient of it are almost in proportion to the critical speed. (4) The order of performance in tool materials for cutting GFRP is K 10, M10, P20, TiC, CB.

• Mineral and Industry
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• v.29
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• pp.1-17
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• 2016

점토광물은 자연 산출되는 광물로써 양이 풍부하고 가격이 저렴하여 여러 가지 산업자원으로써 오래전부터 다양하게 활용되어 왔다. 전통적인 주요 활용분야로는 제지 및 코팅 산업의 충진제, 내화재, 세라믹, 유리섬유, 시멘트 등에 90% 이상이 사용되어왔다. 최근에야 고무, 플라스틱 및 페인트의 물성 강화용 충진제로, 넓은 표면적을 활용한 촉매제로 일부 사용되고 있지만 대부분 판상용 점토광물을 대상으로 하고 있다. 고령토가 국내 생산 주요 품목에 들어가지만 그 비중은 2014년 기준 1.9%로 낮으며, 그나마 자급율도 77% 수준이라 수입에 의존하고 있다. 생산되는 고령토의 양이 매년 감소하고 있는 추세이며, 2014년 기준 고품질인 Wa와 Wb의 생산량이 각각 600 톤과 227 톤으로 미미한 수준이며 P급이 4.1만 톤 수준이라 부가가치가 매우 낮은 상품 중의 하나로 보인다. 다행히 우리나라에서 생산되는 고령토의 많은 부분이 할로이사이트 계열 고령토이고, 할로이사이트의 독특한 나노튜브 형태는 신소재 개발과 더불어 부가가치가 높은 새로운 활용분야를 개척하기 아주 적절한 광물이어서 그 특성과 산업적 활용 특성을 중심으로 최신 연구동향과 활용분야를 소개하고자 한다.