Characterization of variable stiffness joints for adaptive structures

Qinyu Wang, Patrick Teuffel, Arjan P.H.W. Habraken, Kaspar Jansen, Gennaro Senatore

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This paper presents a new strategy to control the structure dynamic response via a shift of the natural frequencies obtained through using variable stiffness joints. The joints are made of shape memory pol-ymers and are fabricated through 3D printing. Stiffness variation is activated through resistive heating which causes a phase change from a glassy to a rubbery state in order to switch the joint between a ‘locked’ (e.g. a moment connection) and a ‘released’ (e.g. pin) state. This work comprises an experimental and a numerical part: 1) dynamic mechanical thermal analysis (DMTA) has been carried out to characterize the viscoelastic behavior of a 3D printed SMP specimen; 2) the dynamic response of a 2-floor planar frame equipped with four variable stiffness SMP joints is simulated through transient analysis. Numerical results show that through joint stiffness control, the fundamental frequency shifts up to 19% causing a drastic reduction of the dynamic re-sponse under resonance loading. A comparison between variable stiffness joints with viscoelastic and only-elastic behavior shows that viscoelasticity increases mechanical damping up to 4.7 times during the transition phase.
Originele taal-2Engels
TitelAdvances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications
SubtitelProceedings of the 7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa
RedacteurenAlphose Zingoni
UitgeverijCRC Press
Pagina's1045-1050
Aantal pagina's6
ISBN van elektronische versie9780429426506
ISBN van geprinte versie9781138386969
DOI's
StatusGepubliceerd - 22 aug 2019
Evenement7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019) - Cape Town, Zuid-Afrika
Duur: 2 sep 20194 sep 2019

Congres

Congres7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019)
LandZuid-Afrika
StadCape Town
Periode2/09/194/09/19

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