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RISS 인기검색어
- 검색키워드
- 저자 : Fehmi Najar (검색결과 3 건)
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Novel design of interdigitated electrodes for piezoelectric transducers
Ahmed Jemai,Fehmi Najar 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.4
Novel design of interdigitated electrodes capable of increasing the performance of piezoelectric transducers are proposed. The new electrodes’ geometry improve the electromechanical coupling by offering an enhanced adaptation of the electric field to the interdigitated electrode configuration. The proposed analysis is based on finite element modeling and takes into account local polarization effect. It is shown that the proposed electrodes considerably increase the strain generation compared to flat electrode arrangement used for Macro Fiber Composite (MFC) and Active Fiber Composite (AFC) actuators. Also, electric field singularities are reduced allowing better reliability of the transducer against electric failure.
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Novel design of interdigitated electrodes for piezoelectric transducers
Jemai, Ahmed,Najar, Fehmi 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.4
Novel design of interdigitated electrodes capable of increasing the performance of piezoelectric transducers are proposed. The new electrodes' geometry improve the electromechanical coupling by offering an enhanced adaptation of the electric field to the interdigitated electrode configuration. The proposed analysis is based on finite element modeling and takes into account local polarization effect. It is shown that the proposed electrodes considerably increase the strain generation compared to flat electrode arrangement used for Macro Fiber Composite (MFC) and Active Fiber Composite (AFC) actuators. Also, electric field singularities are reduced allowing better reliability of the transducer against electric failure.
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A finite element analysis of a new design of a biomimetic shape memory alloy artificial muscle
Moez Ben Jaber,Mohamed A. Trojette,Fehmi Najar 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.16 No.3
In this work, a novel artificial circular muscle based on shape memory alloy (S.M.A.) is proposed. The design is inspired from the natural circular muscles found in certain organs of the human body such as the small intestine. The heating of the prestrained SMA artificial muscle will induce its contraction. In order to measure the mechanical work provided in this case, the muscle will be mounted on a silicone rubber cylindrical tube prior to heating. After cooling, the reaction of the rubber tube will involve the return of the muscle to its prestrained state. A finite element model of the new SMA artificial muscle was built using the software "ABAQUS". The SMA thermomechanical behavior law was implemented using the user subroutine "UMAT". The numerical results of the finite element analysis of the SMA muscle are presented to shown that the proposed design is able to mimic the behavior of a natural circular muscle
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