Journal: Journal of Intelligent Material Systems and Structures

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SAGE

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ISSN

1045-389X
1530-8138

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Publications1 - 10 of 29
  • Ferroelectric Characterization of Single PZT Fibers
    Item type: Journal Article
    Heiber, Juliane; Belloli, Alberto; Ermanni, Paolo; et al. (2009)
    Journal of Intelligent Material Systems and Structures
  • Experimental characterization and modeling of circular actuators made of interpenetrating polymer network-reinforced acrylic elastomer
    Item type: Journal Article
    Schmidt, Arne; Bergamini, Andreas E.; Kovacs, Gabor; et al. (2013)
    Journal of Intelligent Material Systems and Structures
  • Network of selectively compliant actuators based on shape memory alloys and polymers for a reconfigurable sandwich panel
    Item type: Journal Article
    Testoni, Oleg; Bodkhe, Sampada; Bergamini, Andrea; et al. (2023)
    Journal of Intelligent Material Systems and Structures
    Shape memory alloys (SMA) allow for the realization of smart actuators capable of achieving large stresses and large strains but highly demanding in terms of power input. This work presents a solution integrating shape memory polymers (SMP) in a novel type of selectively compliant actuator to reduce the power input of SMAs. The thermally induced variation in stiffness of the SMP is used to achieve large deformations by temporarily increasing the compliance of the actuator and to lock the actuator in a deformed state by restoring the initial stiffness. The behavior of the actuator is simulated taking into account the viscoelastic behavior of the SMP and validated through a comparison with experimental results. The latter show that the proposed actuator can achieve a maximum contraction of 3.0% and hold a contraction of about 1.6% multiple times without constantly powering the SMA. Finally, a reconfigurable sandwich panel is considered as possible application. A distributed actuator network is implemented in the face sheets of the panel and a digital image correlation system is used to prove the capability of the proposed structure of undergoing large deformations, holding a deformed shape without consuming energy, and recovering its initial shape. A further development of this panel might find application as support structure for morphing aerodynamic surfaces or reconfigurable antennas.
  • Aero-structural optimization and analysis of a camber-morphing flying wing: Structural and wind tunnel testing
    Item type: Journal Article
    Keidel, Dominic; Molinari, Giulio; Ermanni, Paolo (2019)
    Journal of Intelligent Material Systems and Structures
  • Structural vibration control via R-L shunted active fiber composites
    Item type: Conference Paper
    Belloli, Alberto; Niederberger, Dominik; Pietrzko, Stanislaw; et al. (2007)
    Journal of Intelligent Material Systems and Structures
  • Planform, aero-structural and flight control optimization for tailless morphing aircraft
    Item type: Journal Article
    Molinari, Giulio; Arrieta, Andres F.; Ermanni, Paolo (2018)
    Journal of Intelligent Material Systems and Structures
  • Small and large signal ferroelectric properties of single lead zirconium titanate fibers
    Item type: Journal Article
    Bortolani, F.; Michen, M.I.; Graule, T.; et al. (2015)
    Journal of Intelligent Material Systems and Structures
  • A novel concept of modular shape-adaptable sandwich panel with distributed actuation based on shape memory alloys
    Item type: Journal Article
    Testoni, Oleg; Christen, Sandro; Bodkhe, Sampada; et al. (2022)
    Journal of Intelligent Material Systems and Structures
    This work introduces a novel concept of modular, shape-adaptable sandwich panel with a distributed actuation system based on shape memory alloys (SMA). The panel consists of a modular arrangement of rigid cells connected with compliant active joints. Each joint hosts a SMA wire, which can be controlled independently, enabling the panel to achieve multiple shapes and complex curvatures with a single design. A numerical model of the actuators is developed combining the SMA model proposed by Brinson with a finite element model of the compliant joints, and validated against experimental results. Further, a demonstrator of the panel is manufactured and tested implementing four different actuation patterns and measuring the final shapes with a digital image correlation system. The results prove the capability of the proposed concept to achieve both in plane and out-of-plane deformations in the order of millimeters to centimeters, and to reproduce shapes with double curvatures. With the possibility to integrate sensors and additional components inside the core, the proposed shape-adaptable panel can be used to realize smart structures, which might be used for morphing aerodynamic surfaces or reconfigurable space structures.
  • Double-walled corrugated structure for bending-stiff anisotropic morphing skins
    Item type: Journal Article
    Previtali, Francesco; Arrieta, Andres F.; Ermanni, Paolo (2014)
    Journal of Intelligent Material Systems and Structures
  • Cobalt-nickel microcantilevers for biosensing
    Item type: Journal Article
    Ergeneman, Olgac; Suter, Marcel; Chatzipirpiridis, George; et al. (2013)
    Journal of Intelligent Material Systems and Structures
    We present microcantilevers that utilize magnetic actuation for use as mass sensors for bioapplications. The microcantilevers are made of electroplated cobalt–nickel that has low coercivity and high saturation magnetization. The microcantilevers are actuated by applying magnetic fields, and the deflection is measured using a laser Doppler vibrometer. The microfabrication of the microcantilevers is based on two lithography steps, an electroplating step and a sacrificial layer etching step. The magnetic actuation and optical readout using the fabricated cobalt–nickel microcantilever were successfully demonstrated in air under atmospheric pressure and in deionized water. A feedback circuit is used to enhance the quality factor of the microcantilever. The quality factor increased from approximately 550 to 1600 in air and from 7.3 to 10.6 in deionized water. The microcantilevers can be readily functionalized with selective binding molecules and used as a biomass sensor.
Publications1 - 10 of 29