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Course: PRESENTATI 01, Fall 2009School: UPenn
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Internal The Friction of Conductive Fibers SUNFEST 2001 Mary Kutteruf Advisor: Jorge J. Santiago-Aviles Conducting Polymer Fibers Uses Production Spinning Electrospinning Electrospinning Elastic Materials & Hooks Law = M or = J with M = 1/J = stress & = strain For every stress there is a unique equilibrium strain Equilibrium is reached instantaneously The stress strain relationship is...
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Internal The Friction of Conductive Fibers
SUNFEST 2001 Mary Kutteruf Advisor: Jorge J. Santiago-Aviles
Conducting Polymer Fibers
Uses Production Spinning Electrospinning
Electrospinning
Elastic Materials & Hooks Law
= M or = J with M = 1/J = stress & = strain For every stress there is a unique equilibrium strain Equilibrium is reached instantaneously The stress strain relationship is linear.
Anelastic Materials
Equilibrium is not reached instantaneously. Periodic stress leads strain.
is the internal friction.
Periodic force removed exponential decay
A(t)=A0e-f t A0=initial amplitude f = frequency =
Experiment
Run current the through fiber in an orthogonal oscillating magnetic field
Adjust frequency of oscillation to obtain resonance Turning off the current through the fiber & measure the decay Analysis of the decay of the induced current reveals the internal friction of the fiber
Gold Wire Model
Polyaniline Film
Conductive film Did not pass enough current to move stiff film in magnetic field.
Volt...
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