| dc.contributor |
Reddy , J . N . |
|
| dc.contributor |
Creasy , Terry |
|
| dc.creator |
McCutcheon , David Matthew |
|
| dc.date |
2005 -02 -17T21 :04 :04Z |
|
| dc.date |
2005 -02 -17T21 :04 :04Z |
|
| dc.date |
2004 -12 |
|
| dc.date |
2005 -02 -17T21 :04 :04Z |
|
| dc.date.accessioned |
2013 -03 -12T17 :39 :26Z |
|
| dc.date.available |
2013 -03 -12T17 :39 :26Z |
|
| dc.date.issued |
2013 -03 -12 |
|
| dc.identifier |
http : / /hdl .handle .net /1969 .1 /1521 |
|
| dc.identifier.uri |
http : / /hdl .handle .net /1969 .1 /1521 |
|
| dc.description |
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 . |
|
| dc.format |
761883 bytes |
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| dc.format |
electronic |
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| dc.format |
application /pdf |
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| dc.format |
born digital |
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| dc.language |
en _US |
|
| dc.publisher |
Texas A &M University |
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| dc.subject |
Machine Augmented Composites |
|
| dc.subject |
Damping |
|
| dc.title |
Machine augmented composite materials for damping purposes |
|
| dc.type |
Book |
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| dc.type |
Thesis |
|
| dc.type |
Electronic Thesis |
|
| dc.type |
text |
|