Electro-Bonded Laminates (EBLs)

Dielectric materials for variable stiffness elements (in cooperation with ETH IMES-ST)
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The development of structures that can change their shape is a challenging task requiring structures acting as structural members and being compliant when the shape change is needed. The present project is aimed to use electrostatic fields to obtain a reversible lamination of a multilayer structure. Next to the selection of appropriate neat polymer dielectrics, the properties of multilayer polymer dielectrics are investigated and modeled.

Related articles:

Di Lillo, L., Bergamini, A., Carnelli, D. and Ermanni, P.,
Frequency-dependent dielectric response model for polyimide-poly(vinilydenefluoride) multilayered dielectrics
Applied physics letters, Vol. 101, No.1, 2012, pp. 012906

 

Di Lillo, L., Schmidt, A., Carnelli, D., Ermanni, P., Kovacs G., Mazza, E. and Bergamini, A.
Measurement of insulating and dielectric properties of acrylic elastomer membranes at high electric fields
Journal of applied physics, Vol. 111, No. 2, 2012, pp. 024904

 

Di Lillo, L., Carnelli, D., Bergamini, A., Busato, S. and Ermanni, P.
Quasi-static electric properties of insulating polymers at a high voltage for electro-bonded laminates
Smart materials and structures, Vol. 20, No. 5, 2011, pp. 057002

Morphing Airfoil with Adaptive Stiffness (in cooperation with ETH IMES-ST)
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Extensive work has been done on airfoil concepts, actively adapting their shape based on elastic compliance instead of rigid-body motion. In this project adaptation mechanisms using stiffness control by means of adaptive materials are investigated. The focus of the project is set on the exploitation of adaptive strength/stiffness elements to realize structures with variable bending-twist coupling.

Related articles:

Raither, W., Bergamini, A. and Ermanni, P.
Profile beams with adaptive bending-twist coupling by adjustable shearcentre location
Journal of intelligent material systems and structures, Vol. 24, No. 3, 2013, pp. 334 - 346

Raither W., Ghandi, F., Beramini, A., and Ermanni, P.
Adaptive bending-twist coupling in laminated composite plates by controllable shear stress transfer
Composites. Part A, Applied science and manufacturing, Vol. 43, No. 10, 2012, pp. 1709 - 1716

Development of materials for friction based vibration mitigation (in cooperation with Empa-Structural Engineering Lab and ETH IMES-ST)
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Distributed friction damping has been demonstrated to offer outstanding performance for lightweight, slender structures. The requirements set to materials used in electrostatically assisted friction based damping include ideally low activation potential, high resistance to wear and high coefficient of friction. Particle reinforced composite dielectrics hold the promise to offer appealing compromise properties for these applications.

 

Related articles:

Bergamini, A., Christen, R., and Motavalli, M.
Electrostatically tunable bending stiffness in a GFRP CFRP composite beam
Smart materials and structures, Vol. 16, No. 3, 2007, pp. 575 - 582

Bergamini, A., Christen, R., Maag, B., and Motavalli, M.
A sandwich beam with electrostatically tunable bending stiffness
Smart materials and structures, Vol. 15, 2006, pp. 678 - 686

Piezoelectric materials
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Robust Damping in the Concurrent Design of Adaptive Structures (in cooperation with ETH IMES-ST)

The project focuses on vibration damping using shunted piezoelectric devices. In particular we are addressing the fundamental question about the extent to which the additional degrees of freedom introduced in the design space can enhance the design while considering a conflict set of requirements. Furthermore, novel methods to modify the dynamic response of structures, based on the design of suitable structures materials are investigated.

 

Related articles:

Delpero, T., Bergamini, A., and Ermanni, P.
Identification of electromechanical parameters in piezoelectric shunt damping and loss factor prediction
Journal of intelligent material systems and structures, Vol. 24, No. 3, 2013, pp. 287 - 298

Bachmann, F., Bergamini, A., and Ermanni, P.
Optimum piezoelectric patch positioning - A strain energy-based finite element approach
Journal of intelligent material systems and structures, Vol. 23, No. 14, 2012, pp. 1575 - 1591

Casadei, F., Delpero, T., Bergamini, A., Ermanni, P., and Ruzzene M.
Piezoelectric resonator arrays for turnable acoustic waveguides and metamaterials
Journal of applied physics, Vol. 112, No.6, 2012, pp. 064902

Delpero T., Di Lillo, L., Bergamini, A., and Ermanni, P.
Energy harvesting module for the improvement of the damping performance of autonomous synchronized switching on inductance
Journal of intelligent material systems and structures, 2012

Bachmann, F., Oliveira, R., Sigg, A., Schnyder, V., Delpero, T., Jaehne, R., Bergamini, A., Michaud, V., and Ermanni, P.
Passive damping of composite blades using embedded piezoelectric modules or shape memory alloy wires - A comparative study
Smart materials and structures, Vol. 21, No. 7, 2012, pp. 075027