• 제목/요약/키워드: Textile Composites

검색결과 167건 처리시간 0.03초

압전 복합소재와 키리가미 섬유전극을 적용한 스트레쳐블 에너지 하베스팅 소자 (Stretchable Energy Harvester Based on Piezoelectric Composites and Kirigami Electrodes)

  • 김보란;현동열;박귀일
    • 한국전기전자재료학회논문지
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    • 제36권5호
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    • pp.525-530
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    • 2023
  • Stretchable piezoelectric energy harvester (S-PEHs) based on composite materials are considered one of the potential candidates for realizing wearable self-powered devices for smart clothing and electronic skin. However, low energy conversion performance and expensive stretchable electrodes are major bottlenecks hindering the development and application of S-PEHs. Here, we fabricated the S-PEH by adopting the piezoelectric composites with enhanced stress transfer properties and kirigami-patterned textile electrodes. The optimum contents of piezoelectric BaTiO3 nanoparticles inside the carbon nanotube/ecoflex composite were selected as 30 wt% considering the trade-off between stretchability and energy harvesting performance of the device. The final S-PEH shows an output voltage and mechanical stability of ~5 V and ~3,000 cycles under repeated 150% of tensile strain, respectively. This work presents a cost-effective and scalable way to fabricate stretchable piezoelectric devices for self-powered wearable electronic systems.

Effect of polymer addition on air void content of fine grained concretes used in TRCC

  • Daskiran, Esma Gizem;Daskiran, Mehmet Mustafa;Gencoglu, Mustafa
    • Computers and Concrete
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    • 제20권2호
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    • pp.165-176
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    • 2017
  • Textile Reinforced Cementitious Composite (TRCC) became the most common construction material lately and have excellent properties. TRCC can be employed in the manufacture of thin-walled facade elements, load-bearing integrated formwork, tunnel linings or in the strengthening of existing structures. These composite materials are a combination of matrix and textile materials. There isn't much research done about the usage of polymer modified matrices in textile reinforced cementitious composites. In this study, matrix materials named as fine grained concretes ($d_{max}{\leq}1.0mm$) were investigated. Air entraining effect of polymer modifiers were analyzed and air void content of fine grained concretes were identified with different methods. Aim of this research is to study the effect of polymer modification on the air content of fine grained concretes and the role of defoamer in controlling it. Polymer modifiers caused excessive air entrainment in all mixtures and defoamer material successfully lowered down the air content in all mixtures. Latex polymer modified mixtures had higher air content than redispersible powder modified ones. Air void analysis test was performed on selected mixtures. Air void parameters were compared with the values taken from air content meter. Close results were obtained with tests and air void analysis test found to be useful and applicable to fine grained concretes. Air void content in polymer modified matrix material used in TRCC found significant because of affecting mechanical and permeability parameters directly.

동적 충격하중에 의한 미소균열 직조복합구조의 특성 (Micro-Cracked Textile Composite Structures‘ Behavior on the Dynamic Impact Loading)

  • 허해규;김민성;정재권;김용진
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회A
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    • pp.222-227
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    • 2008
  • This study is focused on an integrated numerical modeling enabling one to investigate the dynamic behavior and failure of 2-D textile composite and 3-D orthogonal woven composite structures weakened by micro-cracks and subjected to an impact load. The integrated numerical modeling is based on: I) determination of governing equations via a three-level hierarchy: micro-mechanical unit cell analysis, layer-wise analysis accounting for transverse strains and stresses, and structural analysis based on anisotropic plate layers, II) development of an efficient computational approach enabling one to perform transient response analyses of 2-D plain woven and 3-D orthogonal woven composite structures featuring the matrix cracking and exposed to time-dependent loads, III) determination of the structural characteristics of the textile-layered composites and their degraded features under various geometrical yarn shapes, and finally, IV) assessment of the implications of stiffness degradation on dynamic response to impact loads.

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수지 및 탄소섬유 함유량에 따른 C-SMC 복합재료 물성 연구 (Study on Properties of Carbon Sheet Molding Compound(C-SMC) according to Resin and Carbon Fiber Ratio)

  • 서대경;양석곤;김기영;박민기;박대규;이은하;김용태;배진석
    • 한국염색가공학회지
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    • 제32권4호
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    • pp.245-254
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    • 2020
  • The sheet molding compound composite has been applied divers section. This paper reports processing of carbon fiber reinforced thermosetting composite with diverse resins and which was composed of chopped carbon fiber (30 ~ 60 wt%). Normally the paste that the viscosity is over 15,000 cps has been used in traditional Sheet molding compound (SMC) machine. In this research, SMC machine was designed to make Carbon-sheet molding compound (C-SMC) prepreg which was composed with low viscosity resin (1,800 ~ 2,500 cps increase up to 10,000 cps after aging). In order to confirm the optimal processing condition. Mechanical strength tests including tensile test, shear test, impact test, flexural strength test were conducted on C-SMC composites. Plus we identified the correlation between the mechanical properties and prepreg processing condition (carbon ratio and applied resin).

A comparative study of pine rosin and glutaraldehyde cross linker on mechanical properties of jute corn starch based biocomposite

  • Karishma M. Sakhare;Suraj R. Bamane;Shashikant P. Borkar
    • Advances in materials Research
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    • 제13권4호
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    • pp.269-283
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    • 2024
  • Biocompositesmade up of starch and jute fibres are biodegradable and environmentally friendly materials for sustainable development. In this study, corn starch has been separately modified with 15% pine rosin and 40% glutaraldehyde, and 30% glycerol is used as a plasticizer. The composites have been prepared for three different volume proportions of matrix and jute fibre such as 60:40, 70:30 and 80:20 by using a hot compression moulding machine. The effects of pine rosin and glutaraldehyde on mechanical properties have been studied. Pine rosin modified starch jute composites have shown higher tensile and flexural properties as compared with glutaraldehyde modified starch jute composite. The highest tensile strength and modulus are found at 60:40 matrix and jute fibre volume proportion of pine rosin modified starch jute composite which are 13.97 MPa and 782.94 MPa respectively. Similar trends were found in flexural strength and modulus for pine rosin modified starch jute composite having matrix to jute fibre proportion 60:40 which are 29.18 MPa and 1107.76 MPa respectively. But, in case of impact strength, glutaraldehyde modified starch jute composite having matrix to jute fibre proportion 80:20 have shown highest impact strength that is 59.05 KJ/m2. Starch-jute composite with glutaraldehyde shows 33% more water absorbency as compared to composite having pine rosin as cross linker. Highest FTIR graph indicates that the number of -OH group is much lower in case of pine rosin modified starch than glutatraldehyde modified starch which indicates that bonds formed by pine rosin are much stronger than the bonds formed by glutaraldehyde. The surface morphology of the composite was influenced by pine rosin and glutaraldehyde which is shown in the SEM image.

적층각을 가지는 평직복합재료 적층판의 등가물성치 예측 (Prediction of Effective Properties of Laminated Plain Weave Textile Composites)

  • 우경식;서영욱
    • 한국항공우주학회지
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    • 제31권10호
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    • pp.10-20
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    • 2003
  • 본 논문에서는 임의의 방향각을 가지고 적층된 평직 복합재료에 대하여 미세구조를 모델링하고 수치실험을 통하여 등가물성치를 계산하였다. 층간 상호이동에 의한 평직복합재료의 섬유다발의 배열의 경우의 수는 무한대에 이르므로 여기서는 몬테 카를로법을 이용하여 지정된 경우의 수에 대하여 모델링과 해석을 수행하는 전략을 채택하였다. 또한 평직복합재료의 미세구조를 효과적으로 고려하고 모델링 및 계산시간을 절감하기 위하여 수정된 분할영역 적분에 의한 단일변위장 마크로요소를 사용하였다. 계산결과, 평직복합재료 적층판의 등가물성치는 적층간에 따라서 편차가 크게 나타날 수 있음을 확인하였다. 또한 고전적층판 이론으로 계산한 값과 비교하였을 때 $0^{\circ}$, $45^{\circ}$ 이외의 적층각에서 값의 차이가 크게 났는데, 이로부터 평직복합재료 구조물의 경우 고전적층판이론으로 계산한 등가물성치를 사용할 때 주의가 필요함을 알 수 있었다.

Twisted Yarn 복합재료의 물성치 시험 및 탄성계수 예측 (Characterization and Prediction of Elastic Constants of Twisted Yarn Composites)

  • 변준형;이상관;엄문광;김태원;배성우
    • Composites Research
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    • 제15권6호
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    • pp.30-37
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    • 2002
  • 꼰 섬유(twisted yarn)로 이루어진 복합재료의 탄성계수를 예측하기 위한 강성모델을 제시하였다. 이 모델은 단위 셀 구조를 바탕으로 하여 좌표변환과 구성 재료의 연성 상수를 체적 평균함으로써 복합재료의 탄성계수를 예측하는 방법이다. 해석적인 결과와 실험치와의 비교를 위하여 두 종류의 꼬임 각을 가지는 섬유로 구성된 복합재료에 대한 시험을 하였으며 인장, 압축, 전단 강도와 탄성계수를 구하였다. 이 시험편은 유리섬유 및 에폭시 수지를 사용한 RTM 성형법으로 제조하였다. 탄성계수에 대한 비교 곁과 예측치와 실험치는 비교적 잘 일치하였다. 이 모델에 의해 구해진 3차원적인 탄성계수 값은, 꼬인 섬유로 이루어진 직조형 복합재료 구조물의 구조해석을 위한 기본 물성치 입력값으로 사용될 수 있다.

엔진커버용 폴리프로필렌/유리섬유/대나무섬유 복합체의 물리적 특성에 대한 대나무섬유의 용제 처리의 영향 (Effects of Solvent Treatment of Bamboo Fiber on Physical Properties of Polypropylene/Glass Fiber/Bamboo Fiber Composite)

  • 이수경;임성욱;신형식;우승건;박은영
    • 한국염색가공학회지
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    • 제31권1호
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    • pp.42-47
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    • 2019
  • In this study, the effects of surface treatment of bamboo fiber on the physical properties of polypropylene(PP)/glass fiber(GF)/Bamboo fiber(BF) composite for engine cover were investigated. PP, GF and BF were fixed at 40%, 40% and 20% and the surface of bamboo fibers were treated to 0.5, 1.0 and 2.0% as an acid and alkali solution. PP/GF/BR composites using surface treated bamboo fibers were prepared and their tensile strength, bursting strength and impact strength were measured by universal testing machine(UTM). The composites with alkali treated bamboo fiber showed better mechanical properties than the acid treated composites. It was checked that the optimum alkali content was at 1.0% from the results of mechanical properties. The effect of surface treatment on the mechanical properties was confirmed by SEM images of fractured surface.

A Study on Thermally Bonded Geotextile Separator and Properties of Waste Landfill Application of PVA Geotextile/HDPE Geomembrane Composites

  • Min, Kyung-Ho;Seo, Jung-Min;Hwang, Beong-Bok;Lee, In-Chul;Ruchiranga, Jayasekara Vishara;Jeon, Han-Yong;Jang, Dong-Hwan;Lim, Joong-Yeon
    • Advanced Composite Materials
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    • 제17권3호
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    • pp.235-246
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    • 2008
  • This paper is concerned with geotextiles bonded chemically with geogrid to form a geocomposite. Geotextiles, thermally bonded and non-woven, play an important role as a separator. Also, this study investigates the resistance to the application environment of geotextile composites. Here, numerous tests have been performed and it was revealed from experimental results that thermally bonded geotextile in geosynthetic composites showed superior characteristics to that manufactured from needle punched non-woven method in terms of tensile strength, tensile strain and high separation performance. It was noted from experiments that the geotextile prepared for separation purpose and manufactured in a thermal bonding method showed relatively low permittivity so that it could be used as a smooth separator. In addition, PVA geotextile/HDPE geomembrane composites were designed and manufactured to investigate the waste landfill related properties. Numerous experiments have been performed and experimental results were summarized to evaluate practical applicability of PVA geotextile/HDPE geomembrane composites. Among the properties of proposed geomembrane composites, evaluation has been focused on the investigation of mechanical properties, AOS (apparent opening size), permittivity and ultraviolet stability.