• Title, Summary, Keyword: 지능형 복합재료

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Behavior of Fiber-Reinforced Smart Soft Composite Actuators According to Material Composition (섬유 강화 지능형 연성 복합재 구동기의 재료구성에 따른 거동특성 평가)

  • Han, Min-Woo;Kim, Hyung-Il;Song, Sung-Hyuk;Ahn, Sung-Hoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.41 no.2
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    • pp.81-85
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    • 2017
  • Fiber-reinforced polymer composites, which are made by combining a continuous fiber that acts as reinforcement and a homogeneous polymeric material that acts as a host, are engineering materials with high strength and stiffness and a lightweight structure. In this study, a shape memory alloy(SMA) reinforced composite actuator is presented. This actuator is used to generate large deformations in single lightweight structures and can be used in applications requiring a high degree of adaptability to various external conditions. The proposed actuator consists of numerous individual laminas of the glass-fiber fabric that are embedded in a polymeric matrix. To characterize its deformation behavior, the composition of the actuator was changed by changing the matrix material and the number of the glass-fiber fabric layers. In addition, current of various magnitudes were applied to each actuator to study the effect of the heating of SMA wires on applying current.

Design of an Intelligent Polymer-Matrix-Composite Using Shape Memory Alloy (형상기억합금을 이용한 지능형 고분자 복합재료의 설계)

  • Jeong, Tae-Heon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.21 no.10
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    • pp.1609-1618
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    • 1997
  • Thermo-mechanical behaviors of polymer matrix composite(PMC) with continuous TiNi fiber are studied using theoretical analysis with 1-D analytical model and numerical analysis with 2-D multi-fiber finite element(FE) model. It is found that both compressive stress in matrix and tensile stress in TiNi fiber are the source of strengthening mechanisms and thermo-mechanical coupling. Thermal expansion of continuous TiNi fiber reinforced PMC has been compared with various mechanical behaviors as a function of fiber volume fraction, degree of pre-strain and modulus ratio between TiNi fiber and polymer matrix. Based on the concept of so-called shape memory composite(SMC) with a permanent shape memory effect, the critical modulus ratio is determined to obtain a smart composite with no or minimum thermal deformation. The critical modulus ratio should be a major factor for design and manufacturing of SMC.

Fabrication of Shell Actuator using Woven Type Smart Soft Composite (직조 형태의 지능형 연성 복합재료를 이용한 쉘 구동기의 제작)

  • Han, Min-Woo;Song, Sung-Hyuk;Chu, Won-Shik;Lee, Kyung-Tae;Lee, Daniel;Ahn, Sung-Hoon
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.1
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    • pp.39-46
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    • 2013
  • Smart material such as SMA (Shape Memory Alloy) has been studied in various ways because it can perform continuous, flexible, and complex actuation in simple structure. Smart soft composite (SSC) was developed to achieve large deformation of smart material. In this paper, a shell actuator using woven type SSC was developed to enhance stiffness of the structure while keeping its deformation capacity. The fabricated actuator consisted of a flexible polymer and woven structure which contains SMA wires and glass fibers. The actuator showed various actuation motions by controlling a pattern of applied electricity because the SMA wires are embedded in the structure as fibers. To verify the actuation ability, we measured its maximum end-edge bending angle, twisting angle, and actuating force, which were $103^{\circ}$, $10^{\circ}$, and 0.15 N, respectively.

Application of a fiber optic TR-EEPI sensor to detect deformation and failure in composite materials (복합재료의 변형 및 파손탐지를 위한 광섬유 TR-EFPI 센서의 적용)

  • 박래영;권일범;최낙삼
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.31-34
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    • 2002
  • A study on the method that can measure the internal strain of composite materials is performed to monitor the health status of composite structures. A fiber optic sensor was constructed using the total reflected extrinsic Fabry-Perot interferometer(TR-EFPI) probe with a broadband light source. Result obtained from electrical strain gage adhered on the aluminum beam specimen was compared with that from the fiber optic TR-EFPI sensor and showed a good agreement. It was found that fiber optic TR-EFPI sensor system was adequate for monitoring the strain and thus failure processes in the interior of composite materials.

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Development of Novel Impact Paint Sensor by Using Graphene based Smart Nano Composite (그래핀 기반 지능형 나노복합소재를 이용한 고감도 임팩트 페인트 센서 개발 연구)

  • Kim, Sung Yong;Park, Sehoon;Choi, Gyoung Rak;Park, Hyung-Ki;Kang, Inpil
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.24 no.3
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    • pp.247-252
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    • 2014
  • This paper presents a novel impact sensor which can be fabricated with smart paint made of grapheme. This smart nano paint can be easily installed on structures using a spray-on technique and that can make the sensor low cost and practical. The graphene effectively improves the piezoresistivity of the smart paint and that is available to achieve sensitive impact sensor with high gauge factor. The nano smart-paint can detect sufficient impact to cover the damaged energy range of the composite around 1~3J. The voltage outputs from the sprayed paints show fairly linear responses after signal processing. The impact makes deformation of the structure and it brings change of piezoresistivity of the paint and those converts into voltage output consequently by means of a simple signal processing system. The nano smart paint is lightweight and easily applied to the structural surface, and there is no stress concentration. The nano smart paint is expected to be a cost effective and sensitive multi-functional sensor for composites and other damage monitoring applications in the field of structural health monitoring.

Thermoelectromechanical analysis of piezoelectric fiber composites (열-전기-기계 하중하의 압전섬유 복합재료 해석)

  • Kim, Jun-Sik
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.290-291
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    • 2011
  • 본 논문에서는 열-전기-기계 하중 하의 지능형 복합재료 보 모델을 전산점근해석기법에 기초하여 개발하였다. 열-전기-기계 하중 하의 구조물은 지난 십년간 많은 연구가 있어왔으나, 주로 고전적 보 모델에 기반을 두어 진행되어져 왔다. 멀티피직스 환경하의 구조물은 여러 가지 하중의 조합과 이에 따른 연성효과의 고려가 필수적이다. 따라서 공학적인 가정이 없는 점근해석기법은 보다 정확한 등가 보 모델을 개발하는데 있어 기반요소가 될 수 있다. 본 연구에서는 3차원 멀티피직스 구성방정식으로부터 출발하여 점근기법을 적용 체계적으로 등가 보 모델을 유도하고 그 해석 결과를 고찰하고자 한다.

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A Study on the Application of Ni-Ti Shape Memory Alloy Wire Embedded in Composite Beam as a Sensor. (복합재료 보에 삽입된 Ni-Ti 형상기억합금 선의 센서로의 응용을 위한 연구)

  • Lee, Chang-Ho;Lee, Jung-Ju;Huh, Jeung-Soo
    • Journal of Sensor Science and Technology
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    • v.7 no.4
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    • pp.285-292
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    • 1998
  • Shape Memory Alloy(SMA) has been used in many engineering fields because of its good characteristics of actuator. For example, SMA wire can be embedded easily in the polymer composite laminate and then be used as actuator for structural control. Since the strain have a significant influence on the electrical resistance of SMA wire, It is a possible to use the SMA wire as a sensor of such physical quantities. In this study, the possibility for the application of Ni-Ti SMA wire as a sensor embedded within a composite laminate is investigated.

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A study on the mechanical behavior of the optical fiber sensors embedded in the composite laminate (복합재료 적층판에 삽입된 광섬유 센서의 기계적 특성에 관한 연구)

  • Shin, Kum-Cheol;Lee, Jung-Ju;Kwon, Il-Bum
    • Journal of Sensor Science and Technology
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    • v.8 no.6
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    • pp.440-447
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    • 1999
  • Tensile stress loaded on smart composite structures and thermal stress occurred during the during process of the smart composite materials with embedded optical fiber sensors affect directly the mechanical behavior of the embedded optical fiber sensors within the smart composite structures. Stress distribution within the optical fiber sensors varies with respect to the stacking sequence of the composite laminate and the coating conditions of the optical fibers. The cracks occurred within the composite laminate affect not only the fracture of the composite laminate but also the fracture of the optical fiber sensors embedded within the composite laminate. In this study, firstly, stress distribution of the optical fiber sensors embedded within the composite laminate which is subjected to the tensile and thermal stresses was analyzed using Finite Element Method. And, secondly, the effect of the stacking sequence of the composite laminate and the coating conditions of the optical fiber sensors on the stress distribution of the optical fiber sensors was investigated. Finally, the effect of the crack occurred within the smart composite laminate on the fracture behavior of the optical fiber sensors was also observed through the tensile test.

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