Machine augmented composite materials for damping purposes

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Title: Machine augmented composite materials for damping purposes
Author: McCutcheon, David Matthew
Abstract: In this study the energy dissipation performance of machine augmented composite (MAC ) materials is investigated . MAC materials are formed by inserting simple machines into a matrix material . In this work the machines take the form of fluid filled tubes , and the tube cross -sectional geometry induces fluid flow when it is deformed in its plane . This flow dissipates mechanical energy , and thus provides the composite material with attractive damping properties . The objective of this study is to gain insight into the geometry , the material property combinations , and the boundary conditions that are effective in producing high damping MAC materials . Particular attention is given to tube geometry and to dimensionless parameters that govern the energy dissipation efficiency of a MAC lamina . An important dimensionless parameter is the ratio of solid elastic moduli to the product of the driving frequency and the fluid dynamic viscosity . This is a measure of the ratio of elastic forces in the solid material to the viscous forces in the fluid material that makes up a MAC lamina . Governing equations and simulation methods are discussed . Simplified equations are derived to predict the pressure generated when a tube /matrix cell is squeezed with zero pressure end conditions . Transient , three dimensional finite element models are also used to predict the performance of the damping MAC materials with zero pressure at the ends of the tubes . For the geometry and material properties considered , the highest energy dissipation efficiency predicted by these models is approximately 0 .8 out of a maximum of 1 .0 .
URI: http : / /hdl .handle .net /1969 .1 /1521
Date: 2005-02-17

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Machine augmented composite materials for damping purposes. Available electronically from http : / /hdl .handle .net /1969 .1 /1521 .

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