• Title/Summary/Keyword: 형상기억

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Processing of NiTi Shape Memory Alloy by Self- propagating High-temperature Synthesis (자전 고온 반응 합성법을 이용한 NiTi계 형상기억 합금의 제조에 관한 연구)

  • 윤종필
    • Journal of Powder Materials
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    • v.2 no.2
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    • pp.158-164
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    • 1995

  • Synthesis of the NiTi shape memory alloy using the thermal explosion mode of the self-propagating high-temperature synthesis has been investigated. The significant fractions of intermetallics phases were found to form at the Ti/Ni powder interface during the heating to the ignition temperature and seemed to influence the relative fraction of phases in the final products. As the heating rate to the ignition temperature was increased, the combustion temperature and the fraction of NiTi in the final reaction products were increased. The synthesis reaction under 70 MPa compressive pressure yielded a reaction product with 98% theoretical density.

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Morphing of Composite Plate Using SMA Actuator (형상기억합금 작동기를 이용한 복합재 평판의 형상변형)

  • 김상헌;조맹효
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2003.10a
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    • pp.146-149
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    • 2003

  • Two-way shape memory effect(TWSME) under residual stresses are considered in the present study. The structure using two-way shape memory alloy(SMA) concept returns to its initial shape by increasing or decreasing temperature under the initially given residual stress. In the present study, we use a thermo-mechanical constitutive equation of SMA and laminated composite plates are considered as simple morphing structural components which are based on first order shear deformable laminated composite plate with large deflection. Numerical results of fully coupled SMA-composite structures are presented

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Polyurethane-Carbon Nanotube Composites With Shape Memory Effect (형상기억 효과를 갖는 폴리우레탄-카본나노튜브 복합재료)

  • 김정원;정용채;조재환
    • Proceedings of the Korean Fiber Society Conference
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    • 2003.10b
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    • pp.201-202
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    • 2003

  • 탄소나노튜브는 역학적 물성이 뛰어날 뿐만 아니라 전기적 특성도 우수하여 현재 매우 많은 연구와 응용개발이 시도되고 있다 일반적으로 전기전도성 고분자 복합체를 얻기 위한 방법으로 카본블랙이나 전도성 섬유, 금속섬유, 전도성 분말 등을 고분자에 혼입하는 방법을 주로 이용하지만, 복합체 내에서 나노구조 형성이 가능한 탄소나노튜브를 이용하면 나노물질의 특성상 매우 유리한 점이 많다. 예를 들면, 우수한 전기특성, 낮은 임계농도, 우수한 역학적 성질 둥이다. (중략)

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Morphing of Composite Beam actuated by SMA Actuator (형상기억합금 작동기로 작동되는 복합재 보의 형상변형)

  • Kim Sanghaun;Cho Maenghyo
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2004.04a
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    • pp.123-126
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    • 2004

  • Two-way shape memory effect(TWSME) under residual stresses are considered in the present study. The structure using two-way shape memory effect concept returns to its initial shape by increasing or decreasing temperature under the initially given residual stress. In the present study, we use a thermo-mechanical constitutive equation of SMA and laminated composite beam are considered as simple morphing structural components which are based on large deformable 2D composite beam theory. Numerical results of fully coupled SMA-composite structures are presented.

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Material Properties and Strengthening Mechanism in Shape Memory TiNi Fiber Reinforced Al Matrix composite (TiNi/Al 형상기억 지적복합재료의 기계적 특성 및 강화기구)

  • Park, Yeong-Cheol;Yun, Du-Pyo;Lee, Gyu-Chang;Huruya, Y.
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.21 no.3
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    • pp.405-413
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    • 1997

  • In the present paper, it is attempted to reconfirm the "Intelligent" material properties using both the sintered TiNi/Al(1100) matrix composite made by powder metallurgy method and the squeeze-casted TiNi/Al6061 specimens. A metal matrix composite is, its fault has been considered to deteriorate a strength of composite by heating residual stress of the matrix. Therefore, it is necessary to remove a tensile residual stress, to produce the strength of a composite better. On the contrary, if compressive residual stress happens in matrix of composite in place of tensile residual stress, it will make the strength of composite better. So that, this paper introduce the development of a high strength of composite, by using compressive residual stress well, on the study. By using these specimens, shape memory strengthening effects in tensile strength and fatigue crack propagation above inverse transformation temperature of TiNi fiber were investigated. We occurs the prestrain and volume fraction for to discuss the effects of a composite strength. Moreover, by SEM observation, the effect of the residual stress at the interface between Al matrix and TiNi fiber and some brittle precipitation layers such as inter metallic compounds on fracture mechanisms was discussed metallurgically.urgically.

  • https://doi.org/10.22634/KSME-A.1997.21.3.405 인용 PDF