Characterization of viscoelastic properties of polymer bar using iterative deconvolution in the time domain

A new approach to characterize the viscoelastic properties of a polymer bar using wave propagation phenomenon that is dominated by attenuation and dispersion is presented. A novel iterative deconvolution algorithm is proposed to directly extract the impulse response function (IRF) from the measured...

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Veröffentlicht in:Mechanics of materials Jg. 38; H. 12; S. 1105 - 1117
Hauptverfasser: Liu, Qunli, Subhash, Ghatu
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Lausanne Elsevier Ltd 01.12.2006
Amsterdam Elsevier Science
New York, NY
Schlagworte:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
High strain rate
Iterative deconvolution algorithm
Low impedance materials
Physics
Polymer Hopkinson bar
Solid mechanics
Static elasticity (thermoelasticity...)
Structural and continuum mechanics
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
Viscoelasticity
Wave propagation
Viscoelasticity
Polymer Hopkinson bar
Wave propagation
Iterative deconvolution algorithm
Low impedance materials
High strain rate
Vibration
Iterative method
Polymer
Wave damping
Data reduction
Truncation
Deformation measurement
Response function
Deconvolution
Linear time invariant system
Time domain method
Pulse response
Hopkinson bar
High speed
Frequency response
System identification
Impact test
ISSN:0167-6636, 1872-7743
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Zusammenfassung:A new approach to characterize the viscoelastic properties of a polymer bar using wave propagation phenomenon that is dominated by attenuation and dispersion is presented. A novel iterative deconvolution algorithm is proposed to directly extract the impulse response function (IRF) from the measured discrete strain signals in the time domain. The algorithm can identify the response of a linear time-invariant system from the measured input and output signals that are often subjected to noise and truncation. The derived IRF is the non-parametric characterization of the viscoelasticity of the polymer bar and is employed to predict strain signal at the next position and/or to retrieve strain signal at a previous position for verification. The parametric representation of the viscoelasticity is implemented on the basis of a universal linear viscoelastic (multiple Maxwell elements) model and the associated frequency response of the derived IRF. A spectrum of viscoelastic parameters was identified for the polymer bar and the results are presented. As an application example of this approach, a data reduction procedure to extract the high strain rate response of low impedance materials from strain signals obtained from a polymer split Hopkinson pressure bar is presented.
Bibliographie:ObjectType-Article-2
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ISSN:0167-6636
1872-7743
DOI:10.1016/j.mechmat.2006.01.001