Feasibility Study of Viscous Dampers Utilizing Smart Material: Shear Thickening Fluid
Date Issued
2009
Date
2009
Author(s)
Yu, Chung-Han
Abstract
The study focus on theoretical analysis of the behavior of viscous damper utilizing smart material, which is so called Shear Thickening Fluid. By the result of material testing and theory derivation, study the feasibility of installing this kind of new type viscous dampers into real structures. The viscosity behavior of the shear thickening fluid is that, while the fluid is under low shear rate range, the viscosity will rise steeply with shear rate; while the fluid is under middle shear rate range, the viscosity will decrease slowly; and in the end, while the fluid is under much higher shear rate range, the viscosity will maintains in a stable value and behaves like a Newtonian fluid. Fill the Shear Thickening Fluid into simply flow mode damper, so that the damper could behaves like the traditional viscous damper with α<1 (F = CVα), which has been proved have much more ability to dissipate energy from earthquake then other viscous dampers with α≧1. The advantages of Shear Thickening Fluid filled dampers are that the design method is only to change the thickness of fluid and size of dampers. It is much more convenience than traditional viscous dampers. The study use 12nm fumed silica particles and Polypropylene Glycol (PPG) to produce Shear Thickening Fluid. These two kind of material are easily to obtain and have low cost. The produce process is very simple. The only thing need to do is to mix these two materials together and stir sufficiently. The advantage of this fluid is that it has low sensitivity to temperature. This advantage makes the Shear Thickening Fluid suitable to work in the dampers. The study combined the theory of fluid and the mechanism of dampers, and furthermore derived out the behavior of Shear Thickening Fluid filled dampers, and proved that both of the relation between damper force and velocity and hysteresis loop are very like the behavior of traditional viscous dampers with α<1. On the other hand, the experiment presented in this study showed that the Shear Thickening Fluid is easily to produce and the properties of behavior is quite reasonable.
Subjects
Shear Thickening Fluid (STF)
Viscous Damper
Smart Material
Passive Control
Rheology
Type
thesis
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