Print Email Facebook Twitter Multi-scale experimental testing on variable stiffness and damping components for semi-active structural control Title Multi-scale experimental testing on variable stiffness and damping components for semi-active structural control Author Wang, Qinyu (Eindhoven University of Technology) Senatore, Gennaro (Swiss Federal Institute of Technology) Jansen, K.M.B. (TU Delft Emerging Materials; TU Delft Sustainable Design Engineering) Habraken, Arjan (Eindhoven University of Technology) Teuffel, Patrick Department Sustainable Design Engineering Date 2021 Abstract This paper presents experimental testing of a new semi-active vibration control device comprising a shape memory polymer (SMP) core that is reinforced by an SMP-aramid composite skin. This control device works as a load-transfer component that can be integrated into truss and frame structures in the form of a joint. At the material level, thermal actuation from ambient (25 °C) to transition temperature (65 °C) causes a significant 40-fold increase in damping due to viscoelastic effects. At the component level, uniaxial tensile and four-point bending tests have shown that tensile strength depends primarily on the bond strength between the reinforcement skin and the structural element while flexural strength depends on the strength of the reinforcement skin fibers. Through cyclic testing, it has been observed that material viscoelasticity is beneficial to ductility and energy dissipation. When the joint core is actuated to the SMP transition temperature, axial and flexural stiffness decrease by up to 50% and 90%, respectively. The property change at material and component levels enable tuning the frequency and damping ratio at the structure level, which has been successfully employed to mitigate the dynamic response of a 1/10 scale three-story prototype frame under resonance and earthquake loadings. Subject Adaptive structuresMultiscale experimental testingSemi-active vibration controlStructural jointVariable stiffness and dampingViscoelastic material To reference this document use: http://resolver.tudelft.nl/uuid:d268f674-5f0c-4635-97dc-02274472e049 DOI https://doi.org/10.1016/j.compstruct.2021.114976 ISSN 0263-8223 Source Composite Structures, 281 Part of collection Institutional Repository Document type journal article Rights © 2021 Qinyu Wang, Gennaro Senatore, K.M.B. Jansen, Arjan Habraken, Patrick Teuffel Files PDF 1_s2.0_S0263822321014033_main.pdf 10.91 MB Close viewer /islandora/object/uuid:d268f674-5f0c-4635-97dc-02274472e049/datastream/OBJ/view