TY - JOUR
T1 - Multi-scale experimental testing on variable stiffness and damping components for semi-active structural control
AU - Wang, Qinyu
AU - Senatore, Gennaro
AU - Jansen, Kaspar
AU - Habraken, Arjan
AU - Teuffel, Patrick
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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.
KW - Adaptive structures
KW - Multiscale experimental testing
KW - Semi-active vibration control
KW - Structural joint
KW - Variable stiffness and damping
KW - Viscoelastic material
UR - http://www.scopus.com/inward/record.url?scp=85120352620&partnerID=8YFLogxK
U2 - 10.1016/j.compstruct.2021.114976
DO - 10.1016/j.compstruct.2021.114976
M3 - Article
AN - SCOPUS:85120352620
SN - 0263-8223
VL - 281
JO - Composite Structures
JF - Composite Structures
M1 - 114976
ER -