In-situ damage sensing of woven composites using carbon nanotube conductive networks

Na, Won-Jin; Byun, Joon‐Hyung; Lee, Myoung‐Gyu; Yu, Woong‐Ryeol

doi:10.1016/j.compositesa.2015.07.017

Cited by 18 publications

(9 citation statements)

References 35 publications

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“…When the sample is strained, its electrical resistance will be altered due to separation of the conductive nanoparticles and changes in the inter-particle distance. The distance will vary linearly and proportionally with strain increases from s 0 to s, hence it can be expressed as follows: (6) where l 0 is the initial length of the sample, Δl is the deformation length, is tensile strain elongation, and C is a constant depending on material systems.…”

Section: Modeling and Mechanismmentioning

confidence: 99%

“…At appropriate filler content, the resulting conductive polymer composites (CPCs) showed excellent electrical conductivities and considerable mechanical strength. These attributes were used to develop smart structural materials, including damage self-sensing (or damage self-monitoring) polymer composites able to provide structural and sensing properties [6][7][8]. The ability to detect damage in composite materials is extremely important and particularly in safety critical applications such as in the aerospace or automotive sectors.…”

Section: Introductionmentioning

confidence: 99%

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Damage self-sensing behavior of carbon nanofiller reinforced polymer composites with different conductive network structures

Xiang

Wang

Tang

et al. 2018

Polymer

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Multi-walled carbon nanotube (MWCNTs) and graphene nanoplatelet (GNPs) filled high-density polyethylene (HDPE) composites with randomly dispersed (DCN) and segregated (SCN) conductive network structures were fabricated by a solution-assisted mixing method. The damage self-sensing behavior of the resulting composites was investigated via in situ electrical-mechanical measurements. The results show that nanofiller type and conductive network structure significantly influence the damage self-sensing behavior of the composites. The relative resistance change (RRC) of HDPE/MWCNT composites during tensile deformation can be divided into three stages. Compared to HDPE/MWCNT composites with DCN structures, more robust conductive networks are formed in SCN structures, resulting in smaller RRC. The self-damage sensing behavior of all HDPE/GNP composites follows a similar trend, starting with a quasi-linear increase in RRC followed by a sudden rise induced by brittle fracture of the material. Nanofiller content was also found to affect the damage self-sensing behavior of the composites with a higher nanofiller loading corresponding to a lower damage sensing sensitivity. A modeling study based on tunneling theory was also conducted to further analyze the mechanism. In addition, the tensile properties of the composites were measured. This study provides some important information for development of smart structural materials.

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Section: Modeling and Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Damage self-sensing behavior of carbon nanofiller reinforced polymer composites with different conductive network structures

Xiang

Wang

Tang

et al. 2018

Polymer

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“…또한 섬유의 배열을 평가하기 위한 방법이 필요하다. 1.2 cm의 길이를 가지는 섬유에 대 해서 분포 정도를 X-ray방법으로 확인하는 연구결과도 있지만 [18], 고가의 장비를 이용한 분석법 이외에 쉽게 강화재의 분포를 평가할 수 있는 방법이 필요하며, 전 기저항 측정법을 이용하여 기지 내 섬유의 배열 정도 를 평가하는 간단한 평가방법도 연구되고 있다 [19,20] Figure 1은 사출 단계에 금형의 전기저항 변화도변 화를 관찰하기 위한 모식도와 금형에 전극을 형성시 킨 사진을 나타낸 결과이다. 참 고 문 헌…”

Section: )unclassified

Evaluation of Fiber Arrangement Condition of CF/PP Composites Using Electrical Resistance Measurement and Wettability

Kwon¹,

Shin²,

Kim³

et al. 2016

Adhesion and Interface

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Fiber arrangement was important for fiber reinforced thermoplastic composites using injection fabrication. In this work, fiber arrangement in CF/PP was investigated to use electrical resistance (ER) method during injection times. There were 3 types of injection products of CF/PP with different ER change ratio by fiber arrangement. High ER change ratio case of injection CF/PP products had better increased tensile strength. This reason was due to the fiber arrangement of CF/PP by injection. Fractured surface and contact angle of CF/PP products were used to evaluate for injection product quality. Uniform fiber arrangement of CF/PP by injection type exhibited the uniform heat condition of melted CF/PP. Steady thermal transfer effect occurred from melted CF/PP to steel injection mold. Steady thermal transfer effect of CF/PP was transmitted to high ER change ratio of mold. Ultimately, good condition CF/PP product by injection molding method could be predicted by using ER method.

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“…Based on the changes in electrical resistance, Kwon et al [9] use several MWCNT thin films for damage sensing in Carbon fiber epoxy composites. In further studies, MWCNT-epoxy nanocomposite are used for damage sensing by analyzing the changes in electrical resistance [10,11]. These sensory features of MWCNT-epoxy nanocomposites are exploited to use these nanocomposites as strain sensors for health monitoring in industry [12,13,14,15].…”

Section: Introductionmentioning

confidence: 99%

Condition monitoring of crack extension in the reinforcement adhesive joints by carbon nanotubes

2020

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Carbon nanotubes (CNT) are ideally suited to be employed for damage sensing in fiber rein- forced composite structures. In this work, the capability of CNTs for crack extension of a single lap Al-Al adhesive joints (SLJ) under shear load is studied using electrical resistance change. Different weight per- cent of CNT are added to epoxy adhesive. Epoxy adhesive with high concentration of CNT is obtained during shear loading to have the maximum strength and provide the best sensory properties. To provide a more concise evaluation of the crack extension in the adhesive layer under shear load, artificial defects are embedded into the SLJ specimens. The effects of square and circular defects with two different sizes on the crack extension in the adhesive layer are evaluated. The results showed that the maximum relative resistance change has occurred by 220% when the microcracks are initiated and accordingly developed from the nanoadhesive and changed its direction from the Square defect boundary. Additionally, in comparison with interface fracture in defective adhesive joint, when a part of crack grows through the adhesive layer, the resistance change showed higher values.

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In-situ damage sensing of woven composites using carbon nanotube conductive networks

Cited by 18 publications

References 35 publications

Damage self-sensing behavior of carbon nanofiller reinforced polymer composites with different conductive network structures

Damage self-sensing behavior of carbon nanofiller reinforced polymer composites with different conductive network structures

Evaluation of Fiber Arrangement Condition of CF/PP Composites Using Electrical Resistance Measurement and Wettability

Condition monitoring of crack extension in the reinforcement adhesive joints by carbon nanotubes

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