Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Shape Recovery Analyses of SMA Actuator-Activated Composite Shells Considering 3-D SMA Material Behaviors

3차원 거동이 고려된 형상기억합금 작동기 부착 복합재 쉘의 변형해석

  • Published : 2003.05.01
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Abstract

Shape memory alloys (SMA) are often used in smart structures as active components. Their ability to provide large recovery forces and displacements has been useful in many applications, including devices for artificial muscles, active structural acoustic control, and shape control. Based on the 3-dimensional SMA constitutive equation in this paper, the radial displacement control of externally pressurized circular and semicircular composite cylinders under external pressure with a thin SMA layer bonded on its inner surface or inserted between composite layers in investigated using 3-dimensional finite element analysis. Upon actuation through resistive heating, SMAs start to transform from martensitic into austenitic state, simultaneously recover the prestrain, and thus cause the composite cylinders to go back to their original shapes of the cylinder cross-sections.

형상기억합금은 스마트 구조물에서 작동기로 널리 쓰인다. 형상기억합금은 초기변위를 부고 열을 가하게 되면 단위 부피당 큰 회복력과 변위를 발생한다. 형상기억합금의 이론 특성은 인공근육, 작동기, 소음 및 진동감쇠, 형상의 변형 제어 등에 응용될 수 있다. 본 논문에서는 형상기억합금의 3차원 비선형 구성방정식을 이용하여 재료의 거동특성을 해석하고, 형상기억합금이 부착된 스마트구조로 응용될 수 있는 공기 흡입 덕트, 항공기 및 잠수함 동체 등의 구조를 압력이 존재하는 원형 및 복원을 해석하였다. 수치해석결과, 형상기억합금 엑츄에이터가 내압 하에서 작동하자 단면은 변형전의 모습(낮은 응력상태)으로 회복되었다.

Keywords

References

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