• Title, Summary, Keyword: Hybrid thermoplastic composite

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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 $100{\mu}m$.

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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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.

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.

Fabrication and Characterization of Carbon Nanotube/Carbon Fiber/Polycarbonate Multiscale Hybrid Composites

  • Cho, Beom-Gon;Hwang, Sang-Ha;Park, Young-Bin
    • Composites Research
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    • v.29 no.5
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    • pp.269-275
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    • 2016
  • Multiscale hybrid composites, which consist of polymeric resins, microscale fibers and nanoscale reinforcements, have drawn significant attention in the field of advanced, high-performance materials. Despite their advantages, multiscale hybrid composites show challenges associated with nanomaterial dispersion, viscosity, interfacial bonding and load transfer, and orientation control. In this paper, carbon nanotube(CNT)/carbon fiber(CF)/polycarbonate(PC) multiscale hybrid composite were fabricated by a solution process to overcome the difficulties associated with controlling the melt viscosity of thermoplastic resins. The dependence of CNT loading was studied by varying the method to add CNTs, i.e., impregnation of CF with CNT/PC/solvent solution and impregnation of CNT-coated CF with PC/solvent solution. In addition, hybrid composites were fabricated through surfactant-aided CNT dispersion followed by vacuum filtration. The morphologies of the surfaces of hybrid composites, as analyzed by scanning electron microscopy, revealed the quality of PC impregnation depends on the processing method. Dynamic mechanical analysis was performed to evaluate their mechanical performance. It was analyzed that if the position of the value of tan ${\delta}$ is closer to the ideal line, the adhesion between polymer and carbon fiber is stronger. The effect of mechanical interlocking has a great influence on the dynamic mechanical properties of the composites with CNT-coated CF, which indicates that coating CF with CNTs is a suitable method to fabricate CNT/CF/PC hybrid composites.

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.

Manufacturing and Mechanical Properties of Sisal Fiber Reinforced Hybrid Composites

  • Hui, Zhi-Peng;Sudhakara, P.;Wang, Yi-Qi;Kim, Byung-Sun;Song, Jung-Il
    • Composites Research
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    • v.26 no.5
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    • pp.273-278
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    • 2013
  • PLA/PP polymer blends in various ratios (PLA:PP = 9:1, 4:1, 3:1, and 1:1), and their composites (PLA:PP = 1:1) with sisal fiber (10, 15 and 20 wt%) were fabricated using MAPP as compatibilizer. The aim of the work was to reduce the cost of biodegradable composites as well as to improve the impact strength of PLA using PP, a relatively cheaper thermoplastic. The developed composites were characterized for their morphological and mechanical properties. The tensile strength and modulus of the blends were decreased with increasing PP content whereas the strain at break and impact strength are increased. The tensile strength, modulus and water absorption were increased for hybrid composites with increasing fiber content.

Effects of Fiber Surface-Treatment and Sizing on the Dynamic Mechanical and Interfacial Properties of Carbon/Nylon 6 Composites

  • Cho, Dong-Hwan;Yun, Suk-Hyang;Kim, Jun-Kyung;Lim, Soon-Ho;Park, Min;Lee, Geon-Woong;Lee, Sang-Soo
    • Carbon letters
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    • v.5 no.1
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    • pp.1-5
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    • 2004
  • The effects of fiber surface-treatment and sizing on the dynamic mechanical properties of unidirectional and 2-directional carbon fiber/nylon 6 composites by means of dynamic mechanical analysis have been investigated in the present study. The interlaminar shear strengths of 2-directional carbon/nylon 6 composites sized with various thermosetting and thermoplastic resins are also measured using a short-beam shear test method. The result suggests that different surface-treatment levels onto carbon fibers may influence the storage modulus and tan ${\delta}$ behavior of carbon/nylon 6 composites, reflecting somewhat change of the stiffness and the interfacial adhesion of the composites. Dynamic mechanical analysis and short-beam shear test results indicate that appropriate use of a sizing material upon carbon fiber composite processing may contribute to enhancing the interfacial and/or interlaminar properties of woven carbon fabric/nylon 6 composites, depending on their resin characteristics and processing temperature.

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Replication of Hybrid Micropatterns Using Selective Ultrasonic Imprinting (선택적 초음파 임프린팅을 사용한 복합 미세패턴의 복제기술)

  • Lee, Hyun Joong;Jung, Woosin;Park, Keun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.1
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    • pp.71-77
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    • 2015
  • Ultrasonic imprinting is a micropattern replication technology for a thermoplastic polymer surface that uses ultrasonic vibration energy; it has the advantages of a short cycle time and low energy consumption. Recently, ultrasonic imprinting has been further developed to extend its functionality: (i) selective ultrasonic imprinting using mask films and (ii) repetitive ultrasonic imprinting for composite pattern development. In this study, selective ultrasonic imprinting was combined with repetitive imprinting in order to replicate versatile micropatterns. For this purpose, a repetitive imprinting technology was further extended to utilize mask films, which enabled versatile micropatterns to be replicated using a single mold with micro-prism patterns. The replicated hybrid micropatterns were optically evaluated through laser light images, which showed that versatile optical diffusion characteristics can be obtained from the hybrid micropatterns.