Particulate enhanced damping of sandwich structures
Abstract
This work investigates particulate impact damping in sandwich structures. Experimental design and testing of particulate filled structures is conducted. Experiments show that the inclusion of free particulate within a sandwich structure can greatly enhance the damping with only a moderate increase in the weight and no effect on the stiffness. An analytical solution to the particulate motion in a single degree of freedom system is modified to extract a numerical value of effective viscous damping. The accuracy of this prediction is verified by testing coupons of the particulate filled materials. The effective damping predicted by the model is then used in FEM modeling to analyze a system with particulate impact damping without having to directly study the motion of the particulate. The multiple impact damper FEM solution is also verified by experimental testing. The damping predictions by the impact model and by FEM analysis are in good agreement with testing, but are slightly conservative due to damping effects that have not been included in the model.
Degree
Ph.D.
Advisors
Sun, Purdue University.
Subject Area
Aerospace materials|Mechanical engineering
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