• Title, Summary, Keyword: composite material

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복합재료 적층판의 유한요소법 기반 역학적 거동 해석

  • Im, Yeong-Nam;Cheon, Jae-Hui;Lee, Ho-Seong
    • Proceeding of EDISON Challenge
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    • pp.285-291
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    • 2015
  • In this paper, a composite material analysis program based on the finite element method(FEM) is used. The purpose of this study was to verify whether the composite material analysis program which developed as part of a project of development of softwares and educational contents for structural vibration and composite material analysis that can calculate how similar the macroscopic mechanical behavior of the composite materials actually. Because composite materials are generally anisotropic, analysis of composite laminate is used for the constitutive equations of orthotropic material. For convenience, the unit is ommited in all calculations. To verify the accuracy of the finite element method based program, the deflection and stress distribution of the simply supported composite material laminated plate subjected to a uniform load distribution is compared with exact solution. Size and properties of the composite material laminate used for analysis are fixed variables, and by changing the number of elements and the total thickness of the laminate is compared with the exact solution to the resulting value, respectively.

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The Influence of Repeated Loading Cycles on Strength Ratio of Carbon/Epoxy Composite Laminates (Carbon/Epoxy 복합재료 적층판의 반복하중에 따른 강도계수의 변화에 대한 연구)

  • Kim, Doo-Hwan;Kim, Young-Feel
    • Journal of the Korean Society of Safety
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    • v.24 no.3
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    • pp.19-24
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    • 2009
  • Currently the technique of composite material field is developed day by day. The many kinds industrial facility and life articles are coming to make with the composite material. But still the engineering works field the building and the bridge uses the material which is old era and is making. To here there is a various problem but the biggest problem the theory of the composite material is complicated too and means that the application is been delayed about constructive structure. When the composite material is used widely from constructive field, too with difficult theory in technical expert and easily with the research for the experiment data accumulation is necessary. The tensile and fatigue test of the carbon/epoxy which is a high-class composite material led from the present paper consequently and the change of the intensity coefficient which follows in repeated load researched.

Synthesis of polyaniline based composite material and its analytical applications for the removal of highly toxic Hg2+ metal ion: Antibacterial activity against E. coli

  • Bushra, Rani;Naushad, Mu.;Sharma, Gaurav;Azam, Ameer;ALOthman, Zeid Abdullah
    • Korean Journal of Chemical Engineering
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    • v.34 no.7
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    • pp.1970-1979
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    • 2017
  • A composite material polyaniline-Zr(IV) phosphoborate (PZPB) was synthesized via sol-gel method by the combination of Zr(IV) phosphoborate and polyaniline. The PZPB composite material was characterized by various analytical techniques. The PZPB composite material was found to be selective for $Hg^{2+}$ metal ion due to the high distribution coefficient values for $Hg^{2+}$ metal ion in all mediums. The PZPB composite material was used for $Hg^{2+}$ removal under different experimental conditions. The antibacterial activity of PZPB composite material was also studied against E. coli.

Estimation of Specific Gravity of Soil Mixture (배합비에 따른 혼합토의 비중 산정)

  • Shin, Hyun-Young;Kim, Kyoung-O;Kim, You-Seok;Park, Jin-Yoo
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.951-954
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    • 2010
  • There are lots of soft ground improvement methods which is consist of different materials. In the analysis and design, composite ground method is usually regarded. Composite ground method considers the area replacement ratio as a key parameter to combine the physical and mechanical characteristics of tow different material. In this study, using composite material consist of three different materials which have different diameters, series of specific gravity test were performed according to KS F 2308, to investigate the applicability of composite ground method. As a result, it is found that composite material which is consist of fine grained soil and granular soil has a high applicability of composite ground method. This result means that, in estimating of ground properties of composite material which is consist of similar fine grained material such as cement mixing etc., composite ground method has a less applicability.

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Composite Material made of Recycling Paper and Plastics (폐지를 활용한 재생 플라스틱)

  • 윤승원;이장용;김윤식
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.697-702
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    • 2002
  • Composite material made of recycling paper and plastics was developed. The tension and bending testing result of developed composite material shows that the cellulose contained in paper contributes much to get high flexural rigidity. As an application example, the raised access floor for office automation purpose was developed by making use of developed composite material. Manufacturing process together with the extrusion die and the compression die for to manufacture the access floor have been developed.

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Advanced Methodology of Composite Materials Qualification for Small Aircraft (소형항공기용 복합재료 인증시험)

  • Lee, Ho-Sung;Min, Kyung-Ju
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.35 no.5
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    • pp.446-451
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    • 2007
  • Since the introduction of advanced composite materials for use in aircraft, the material qualification has been a costly burden to the small airframe manufacturer. For each manufacturer, extensive qualification testing has often been performed to develop the base material properties and allowables at operating environmental conditions, regardless of whether this material system had been previously certificated by other manufacturers. In recent years, NASA, industry, and the FAA have worked together to develop a cost-effective method of qualifying composite material systems by the sharing of a central material qualification database. In this paper, the new methodology of composite material qualification is presented and material allowable of 350°F carbon fiber/epoxy composite material produced domestically is determined with this methodology.

Precise Drilling characteristics of glass fiber epoxy composite material (유리섬유 에폭시 복합재료의 정밀드릴가공 특성)

  • 김홍배
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.7 no.4
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    • pp.117-122
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    • 1998
  • Glass fiber epoxy composite material is widely used in the structures of aircrafts, robots and other machines because of their high specific strength, high specific stiffness and high damping. In order for the composite materials to be used in the aircraft structures or machine elements, accurate surfaces for bearing mounting or joint must be provided, which require precise machining. In this paper, the machinability of the glass fiber epoxy composite material was experimentally investigated. The results can be summarized as follows : 1. The entrance of hole is very good manufacturing existing, but exit come to occur sever surface exfoliation. 2. The cutting force in drilling of the glass fiber epoxy composite material is decreased as the drilling speed increased. 3. If the glass fiber epoxy composite material is drilling by the standard twist drill, then the hole recommand cutting condition is spindle speed 400∼600rpm, feed 40∼50mm/min.

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Requirements for Composite Material Property Sharing System to Korean Products (국산 복합재료의 물성치 공유체계 수립을 위한 요구조건)

  • Suh, Jang Won;Rhee, Seung Yun;Lee, Young Dae
    • Journal of Aerospace System Engineering
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    • v.7 no.1
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    • pp.32-38
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    • 2013
  • This paper presents a survey results on the material properties sharing system database on composite in USA. The requirements on management and database for Korean composite product that meet KAS (Korean Airworthiness Standard) are suggested. The certification policy on composite material qualification of also introduced. The benefits to material supplier, aircraft manufacturer and certification authority, which get through the database have been considered. The database managing process, composite material manufacturing process, properties and design allowable meeting KAS have been suggested.

AE Characteristics for Fracture Mechanism of Al 7075/CFRP Hybrid Composite (Al 7075/CFRP Hybrid 복합재료의 파손특성에 대한 AE 특성 연구)

  • 이진경;이준현;송상헌;윤한기
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.268-271
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    • 2001
  • When compared to other composite materials such as FRP and MMC, hybrid composite material is more attractive one due to the high specific strength and the resistance to fatigue. However, the fracture mechanism of hybrid composite material is extremely complicated because of the bonding structure of metals and FRP. Recently, nondestructive technique has been used to evaluate the fracture mechanism of these composite materials. In this study, AE technique has been used to clarify the fracture mechanism and the degree of damage for Al 7075/CFRP hybrid composite material. It was found that AE event, energy and amplitude among AE parameters were effective to evaluate fracture process of Al 7075/CFRP composite material. In addition, the relationship between the AE signal and the characteristics of failure surface using optical microscope was discussed.

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Biomimetic Preparation of Boron Nitride /PMMA Composite (생체모방기술을 이용한 Boron Nitride /PMMA 복합체 제조)

  • Nam, Kyung Mok;Lee, Yoon Joo;Kim, Bo Yeon;Kwon, Woo Teck;Kim, Soo Ryong;Shin, Dong Geun;Kim, Young Hee
    • Journal of the Korean Ceramic Society
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    • v.51 no.2
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    • pp.103-106
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    • 2014
  • Nacre is an organic-inorganic composite material; it is composed of $CaCO_3$ platelet and protein. The microstructure of nacre is a matrix that is similar to bricks and mortar. Technology inspired by nature is called biomimetic technology. In this study, to make high thermal conducting ceramic composite materials using biomimetic technology, a porous green body was prepared with BN platelets. PMMA was infiltrated into the porous green body to make a composite. The microstructure of the composite was observed with FESEM, and the thermal properties were measured. The thermal conductivity of the prepared organic-inorganic composite was 4.19 $W/m{\cdot}K$.