• Title, Summary, Keyword: Hybrid 열가소성 복합재료

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Fabrication and Characterization of 3D Woven Textile Reinforced Thermoplastic Composites (3차원 직조형 열가소성수지 복합재료 제조 및 특성화)

  • 홍순곤;변준형;이상관
    • Composites Research
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    • v.16 no.2
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    • pp.33-40
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    • 2003
  • In order to overcome one of the most pronounced shortcomings of conventional laminated composites, such as the low damage tolerance due to delamination, the thermoplastic materials and 3D (three-dimensional) preforms have been utilized in the manufacture of composite materials. From the newly developed process termed as the co-braiding, hybrid yarns of the thermoplastic fibers (PEEK) and reinforcing fibers (carbon) have been fabricated. In order to further enhance the delamination suppression, through thickness fibers have been introduced by way of 3D weaving technique in the fabrication of textile preforms. The preforms have been thermoformed to make composite materials. Complete impregnation of the PEEK into the carbon fiber bundles has been confirmed. For the comparison of mechanical performance of 3D woven composites, quasi-isotropic laminates using APC-2/AS4 tapes have been fabricated. Tensile and compressive properties of both the composites have been determined. Furthermore. the open hole, impact and CAI(Compression After Impact) tests were also carried out to assess the applicability of 3D woven textile reinforced thermoplastic composites in aerospace structures.

The Study on the Material Behavior of Hybrid Composites (Hybrid 열가소성 복합재료의 재료거동에 관한 연구)

  • 조현철;이중희
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.67-70
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    • 2000
  • This study was performed to investigate the material behavior of hybrid thermoplastic composites contained glass fiber and calcium carbonate. The composite was prepared with each combination ratio of calcium carbonate, and the content of glass fiber was fixed with 10% by weight. In order to investigate the material behavior for various combination ratio, tension test, flexural test, and impact test were performed. Microscopic observation were conducted to examine the fractured surface of specimen for tension test. And the material behavior of the hybrid thermoplastic composite immersed in salt water with definite time was investigated.

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Effect of Textile Pattern on Mechanical and Impregnation Properties of Glass Fiber/Thermoplastic Composite (유리 섬유/열가소성 복합 재료의 기계적 및 함침 특성에 대한 직물 패턴의 영향)

  • Kim, Neul-Sae-Rom;Lee, Eun-Soo;Jang, Yeong-Jin;Kwon, Dong-Jun;Yang, Seong Baek;Yeom, Jung-Hyun
    • Composites Research
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    • v.31 no.6
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    • pp.317-322
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    • 2018
  • In various industry, the composite is tried to be applied to products and thermoplastic based composite is in the spotlight because this composite can be recycled. The use of continuous fiber thermoplastic (CFT) method increased gradually than long fiber thermoplastic (LFT). In this study, tensile, flexural, and impact test of different array types of glass fiber (GF)/thermoplastic composites were performed to compare with GF array. Impregnation property between GF mat and thermoplastic was determined using computed tomography (CT). At CFT method, thermoplastic film is not wet into GF roving and many voids are appeared into composite. This phenomenon affects to decrease mechanical properties. Plain pattern GF mat was the best mechanical and impregnation properties that distance between two roving was set closely to $100{\mu}m$.

Optimization of Processing Parameters of Compression Molding of Hybrid Thermoplastic Composites (Hybrid 열가소성 복합재료의 압축성형에서 공정변수의 최적화)

  • 이중희;허석봉;이봉신
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.29-32
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    • 2001
  • The objective of this work was to optimize processing parameters of hybrid thermoplastic composites in compression molding. The mechanical properties of the composites manufactured with various forming conditions were measured to characterize processing parameters. Polypropylene(PP) composites containing randomly oriented long carbon fiber and carbon black were used in this work. The composite materials contained 5%, 10%, 15%, and 20% carbon fiber and 5%, 10%, 15%, 20%, and 25% carbon black by weight. Compression molding was conducted at various mold temperatures. The temperature of the material in the mid-plain was monitored during the forming. Crystallinity was also measured by using XRD. The tensile modulus of the composites increase, with increasing the mold temperature. However, the impact strength of the composites decreases as mold temperature increases.

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A Study on the Processing Characteristic in the Compression Molding of Hybrid Thermoplastic Composites (하이브리드 열가소성 복합재료의 압축성형에서 공정특성에 관한 연구)

  • Heo, Seok-Bong;Lee, Joong-Hee;Shin, Gwi-Su;Rhee, Kyoung-Yop
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.12
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    • pp.2550-2555
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    • 2002
  • Hybrid composites usually are defined as composites having different types of reinforcements such as fibers and particles. The major advantage of hybrid composites is able to control the material properties such as optical, electrical, and mechanical properties. For this reason, hybrid composites are widely used in automotive, marine, household, and electrical industries. The objective of this work was to investigate processing characteristics in the compression molding of hybrid thermoplastic composites. The mechanical properties of composites manufactured in various forming conditions were monitored. The composites contained randomly oriented long carbon fiber and carbon black in polypropylene(PP) matrix were used. The carbon fiber contents of composites were 5%, 10%, 15%, and 20%, and carbon black contents were 5%, 10%, 15%, 20%, and 25% by weight. Compression molding was conducted at various mold temperatures. Crstallinity was also measured by using X-RD. The tensile modulus of the composites increased with increasing the mold temperature. However, the impact strength of the composites decreased as the mold temperature increased.

Development of Separation Technology for Adhesively Bonded Hybrid Structures of Metals and Thermoplastic Composites Considering Recycling (재활용을 고려한 금속-열가소성 복합재료 하이브리드 접착 구조의 분리 기술 개발)

  • Han, Soo-Ho;Hwang, Hui-Yun;Bae, Min-Gwan;Park, Sang-Eon;Chang, Hong-Kyu
    • Composites Research
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    • v.31 no.4
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    • pp.128-132
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    • 2018
  • Multi-material design with metals and composites can keep structural functions as well as reduce the weight of automotive parts. However, recycling of automotive parts should be considered due to the increasing emphasis on the environments and pollutions. We derived the key issues for increasing the recycling rate of automotive parts by carrying out a survey targeting representatives and workers related with automotive recycling. The core of the key issues was the separation technology of adhesively bonded metal-composite hybrid structures, so we conducted the basic research and suggested the separation technology which can easily be adopted into the recycling industries.

Evaluation of Internal Defect of Composite Laminates Using A Novel Hybrid Laser Generation/Air-Coupled Detection Ultrasonic System (레이저 발생 초음파와 공기 정합 수신 탐촉자를 이용한 복합재료 적층판의 내부 박리 결함 평가)

  • Lee, Joon-Hyun;Lee, Seung-Joon;Byun, Joon-Hyung
    • Journal of the Korean Society for Nondestructive Testing
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    • v.28 no.1
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    • pp.46-53
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    • 2008
  • Ultrasonic C-scan technique is one of very popular techniques being used for detection of flaws in polymer matrix composite(PMC). However, the application of this technique is very limited for evaluation of defects in PMC fabricated by the automated fiber placement process. The purpose of this study is to develop a novel ultrasonic hybrid system based on nondestructive and non-contact ultrasonic techniques for evaluation of delamination in carbon/epoxy and carbon/PPS composite laminates. It was shown that the newly developed ultrasonic hybrid system based on dual air-coupled pitch-catch technique with ultrasonic scattering reflection concept could provide excellent image with higher resolution of delamination in PMC compared with the conventional pitch-catch method. It is expected that this ultrasonic hybrid technique can be applied for on-line inspection of flaws in PMC during the fabrication process.

Numerical and Experimental Investigation on Impact Performance of Fiber Metal Laminates Based on Thermoplastic Composites (열가소성 복합재료를 기반한 섬유금속적층판의 충격 거동에 관한 실험 및 수치적 연구)

  • Lee, Byoung-Eon;Kang, Dong-Sik;Park, Eu-Tteum;Kim, Jeong;Kang, Beom-Soo;Song, Woo-Jin
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.5
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    • pp.566-574
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    • 2016
  • Fiber metal laminates, which are hybrid materials consisting of metal sheets and composite layers, have contributed to aerospace and automotive industries due to their reduced weight and improved damage tolerance characteristics. In this study, the impact performance of the laminates, which are comprised of a self-reinforced polypropylene and two aluminum sheets, and the pure aluminum alloy sheet material were investigated experimentally via numerical simulation. In order to compare the impact performance, the laminates and aluminum alloy were examined by assessing the impact force, energy time histories, and specific energy absorption. ABAQUS is a commercial software that is used to simulate the actual drop-weight tests. Based on this study, it is noted that the impact performance of the laminates was superior to that of the aluminum alloy. In addition, a good agreement between the experimental and numerical results can be achieved when the impact force and energy time histories from the experiments and the numerical simulations are compared.