• Title/Summary/Keyword: Textile Composites

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The Embedding Reliability and The Spectrum Characteristic of Fiber Bragg Grating Sensor Embedded into Composite Laminates (복합재 평판 내부에 삽입된 광섬유 브래그 격자 센서의 삽입안전성과 신호 특성에 관한 연구)

  • 이정률;류치영;강현규;김대현;구본용;강동훈;홍창선;김천곤
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2000.11a
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    • pp.238-244
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    • 2000
  • FBGs have been extensively used as strain sensors or temperature sensors in a variety of applications related to composites because of embedding ability, small size and multiplexing capability. We inspected embedding environments inside composites with optical fiber by microscope analysis and birefringence characteristics of FBG embedded into textile composite laminate by cure monitoring using a high power WSFL. The cure monitoring of the cases with the striped FBG and the recoated FBG provided comprehensive understandings about the birefringence effect induced by the transverse stress. And these results allowed to consider a recoating method as an important tool to relieve birefringence.

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Feasibility Check of Textile Sensor Made of P(VDF-TrFE) for Structural Health Monitoring of Composite Structures (복합재료 구조물의 건전성 모니터링을 위한 P(VDF-TrFE) 직물센서의 가능성 평가)

  • Bae, Ji-Hun;Chang, Seung-Hwan
    • Composites Research
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    • v.30 no.2
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    • pp.126-131
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    • 2017
  • For structural health monitoring of a complex shaped structure a new sensor that can compensate for the drawbacks of the current sensors such as brittleness is needed and the sensor should be highly flexible and durable. In this study a textile sensor made of polyvinylidene fluoride trifluoroethylene (PVDF-TrFE) which is a type of electroactive polymer was fabricated. And the textile sensors were applied to a complex shaped structure (an egg-box panel made of carbon/epoxy composite) for checking their feasibility of structural health monitoring. To correlate the collapse response with failure mechanisms of the structure the multiply-interrupted compressive test was carried out. During the test, the textile sensors succeeded to prove their applicability for damage detection (crack initiation) by generating electric voltages (0.05 V-0.25 V) in the real time.

A Study on the mechanical Characteristics of Kevlar Plain Weft Knitted Fabrics Reinforced Composites for Development of Intrusion Beam of Car Side Door Application (자동차 사이드 도어용 인트루젼 비임 개발을 위한 케블라섬유강화 복합재료의 기계적 특성에 관한 연구)

  • 이동기
    • Journal of Ocean Engineering and Technology
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    • v.14 no.2
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    • pp.89-98
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    • 2000
  • Using conventional textile techniques such as weaving braiding knitting and stitching it is possible to produce a wide range two and three dimensional fiber preforms, however so far only a limited attention has been given to knitted fabrics in composite industry. This is mainly due to the opinion that knitted fabric reinforced composites posses low mechanical properties owing to their looped fiber architecture. But it is possible to obtain desired mechanical properties by selecting proper knitted fabric structure, In this paper mechanical characteristics of kevlar plain weft knitted fabrics reinforced plastics(KFRP) are evaluated for th development of intrusion beam of car side door. Tensile bending impact properties of KFRP are measured experimentally and crush demands of Americal Federal Motor Vehicle Safety Standard No.214(FMVSS 214) compared with the bending load and displacement of KFRP by quasi-static test method. The applicability and limitation of bending load and displacement of KFRP according to specimen size has been discussed.

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Influence of the Cure Systems on Long Time Thermal Aging Behaviors of NR Composites

  • Choi, Sung-Seen;Kim, Jong-Chul;Lee, Seung-Goo;Joo, Yong-L.
    • Macromolecular Research
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    • v.16 no.6
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    • pp.561-566
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    • 2008
  • NR composites with different curing systems were aged thermally at 60, 70, 80, and $90^{\circ}C$ for 2-185 days in a convection oven, and the changes in the crosslink density were investigated as a function of the accelerated thermal aging. The overall crosslink densities increased with increasing aging time irrespective of the aging temperatures and curing systems. The changes in crosslink density were enhanced by increasing the aging temperature. The degree of the increased crosslink density was in the following order: "the conventional cure system > the semi-EV system > the EV system". For short term thermal aging, the change in crosslink density with the aging time was complicated, particularly for low temperature aging. The activation energies of the change in crosslink density with thermal aging using the conventional and semi-EV cure systems increased and then remained relatively constant with increasing aging time, whereas that of the specimen with an EV cure system tended to increase linearly. The experimental results were explained by the dissociation of the existing polysulfidic linkages and the formation of new cross links through the crosslinking-related chemicals remaining in the sample.

Comparative Study on Mechanical Properties of Sonicated Bamboo and Kenaf Fiber Composite (초음파 처리된 대나무섬유와 케냐프섬유 복합재의 기계적 특성 비교 연구)

  • Lee, Su Kyoung;Park, Eun Young;Park, Tae Sung;An, Seung Kook
    • Textile Coloration and Finishing
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    • v.32 no.4
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    • pp.274-280
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    • 2020
  • This study compared the mechanical properties of bamboo fiber composites and kenaf fiber composites through physical treatment (ultrasonic treatment). Kenaf, a composite of PP reinforced with bamboo fiber, was made using injection molding technology. PP was used as a binder and the ultrasonic treatment time of bamboo and kenaf was increased by 30 minutes to compare and study various mechanical properties of bamboo and kenaf composites through physical treatment. Interfacial properties such as internal cracks and internal structure of the wave cross section were confirmed using a scanning electron microscope (SEM). As a result of the ultrasonic treatment, most of the characteristics were fragile as the ultrasonic treatment time was increased, and it was confirmed that the natural characteristics of the twisted fibers had a great influence on the characteristics of the composite material.

Mechanical Properties of Composites of HDPE and Recycled Tire Crumb (폐타이어 분말과 고밀도 폴리에틸렌 복합재료의 기계적 물성)

  • Kwak, Sung-Bok;Choi, Mi-Ae;Lee, Seong-Jae
    • Elastomers and Composites
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    • v.36 no.1
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    • pp.22-29
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    • 2001
  • For a purpose of recycling of waste tires, composites of 10-60wt% recycled tire crumb blended with high density polyethylene(HDPE) were prepared, and their mechanical properties such as tensile strength, elongation at break, tensile modulus and impact strength were investigated as a function of tire crumb content. Ethylene-acrylic acid(EAA) copolymer was introduced by 10phr as a compatibilizer and the mechanical properties of the composites were measured. For the blend composition of 40wt% tire crumb content showing improved impact strength, the mechanical properties were measured by varying the EAA content of 5-15phr. All blends, whether modified or unmodified, showed a gradual improvement in impact strength as the tire crumb content increased, but the other properties decreased compared with the pure HDPE. In particular, the addition of EAA copolymer to the tire crumb content over 30wt% showed substantial improvement in impact strength. There was no significant effect of tire crumb size on impact strength of the composites.

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Optimization of Coal Ash Water Treatment Conditions to Suppress Concrete Pop-out Based on Coal Ash Containing Expansion Components (팽창성분이 혼입된 석탄재 기반 콘크리트의 팝아웃 발생 억제를 위한 석탄재 수처리 조건 최적화)

  • Jae-Jin Hong;Joo-Han Kang;Mi-Na Kim;Woo-Seong Choi;Myung-Jun Oh;Seong-Yun Kim
    • Composites Research
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    • v.37 no.3
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    • pp.226-231
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    • 2024
  • Coal ash has been used as a sand replacement in the construction industry. Due to the use of bituminous coal as a result of anthracite depletion, and quicklime as an air purifier in the desulfurization process, pop-out defects have recently occurred in concrete using coal ash, severely limiting the recycling of coal ash into concrete. In this study, the components that cause the pop-out problem of the coal ash filled concrete were identified and a pretreatment method to fully expand the expansive components in advance was proposed as a solution to this problem. By treating water twice for 10 min, allowing the CaO mixed in the coal ash to fully expand, the problems of pop-out and reduced compressive strength of the concrete were overcome. The cost and time efficient water treatment method proposed in this study is expected to promote the recycling of coal ash into concrete.

Hydroxyapatite/Chitosan Composites and its Application (Hydroxyapatite/키토산 복합재료 및 그 응용)

  • Chung, Yong-Sik
    • Proceedings of the Korean Fiber Society Conference
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    • 2002.04a
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    • pp.21-24
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    • 2002
  • Hydroxyapatite(HAp, Ca$\sub$10/(PO$_4$)$\sub$6/(OH)$_2$, is a compound with structural and chemical resemblance bone mineral and of particular importance in the field of biomaterials. In addition to the non-toxicity and high compatibility with hard and soft tissue, HAp exhibits strong affinity to host hard tissues and protein molecules. However, HAP is difficult to shape in the specific forms due to its hardness and brittleness. (omitted)

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A Study on the Application of Composites to Pipe Support Clamps for the Light-weight LNGC (LNGC 경량화를 위한 파이프 지지용 클램프의 복합소재 적용 연구)

  • Bae, Kyong-Min;Yim, Yoon-Ji;Yoon, Sung-Won;Ha, Jong-Rok;Cho, Je-Hyoung
    • Composites Research
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    • v.34 no.1
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    • pp.8-15
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    • 2021
  • In the shipbuilding and marine industry, as a technology for reducing the weight of parts to reduce energy and improve operational efficiency of ships is required, a method of applying fibers-reinforced composites which is high-strength lightweight materials, as part materials can be considered. In this study, the possibility of applying fibers-reinforced composites to the pipe support clamps was evaluated to reduce the weight of LNGC. The fibers-reinforced composites were manufactured using carbon fibers and glass fibers as reinforcing fibers. Through the computer simulation program, the properties of the reinforcing materials and the matrix materials of the composites were inversely calculated, and the performance prediction was performed according to the change in the properties of each fiber lamination pattern. In addition, the structural analysis of the clamps according to the thickness of the composites was performed through the finite element analysis program. As a result of the study, it was confirmed that attention is needed in selecting the thickness when applying the fibers-reinforced composites of the clamp for weight reduction. It is considered that it will be easy to change the shape of the structure and change the structure for weight reduction in future supplementary design.