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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.
Highlights
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
Uniaxial tensile and four-point bending tests have shown that tensile strength depends primarily on the bond strength between the reinforce ment skin and the structural element while flexural strength depends on the strength of the reinforcement skin fibers
This paper has focused on component-level testing to investigate the mechanical properties of a new semi-active vibration control device that comprises an SMP core reinforced by an SMP-aramid skin
Summary
Integration of sensing and actuation technologies into structures enables new capabilities such as self-diagnosis, damage detection as well as to actively counteract the effect of loading through adaptation. When a change in the structural and/or environmental characteristics occurs, it might result in signifi cant degradation of control performance which poses a reli ability issue Active control devices, such as active tuned mass dampers [16] and bracing systems [17], provide control forces through actuation based on feedback from sensors that measure the structure response. These active devices perform significantly better than passive ones and are effective in a wide range of conditions, they typically require a high-power density supply and a complex control system [12]. The actuation mechanism is inherent within the properties of the material enabling a reliable control system that is able to perform optimally for diverse structural systems (e.g. multi-story buildings, bridges, airplane wings, wind turbine blades, etc.) [28]
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