CaltechAUTHORS
  A Caltech Library Service

Broadband Electromechanical Spectroscopy: characterizing the dynamic mechanical response of viscoelastic materials under temperature and electric field control in a vacuum environment

le Graverend, J.-B. and Wojnar, C. S. and Kochmann, D. M. (2015) Broadband Electromechanical Spectroscopy: characterizing the dynamic mechanical response of viscoelastic materials under temperature and electric field control in a vacuum environment. Journal of Materials Science, 50 (10). pp. 3656-3685. ISSN 0022-2461. https://resolver.caltech.edu/CaltechAUTHORS:20150420-132839490

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20150420-132839490

Abstract

The viscoelasticity of a variety of active materials is controllable, e.g., by the application of electric or thermal fields. However, their viscoelastic behavior cannot be fully explored by current methods due to limitations in their control of mechanical, electrical, and thermal fields simultaneously. To close this gap, we introduce Broadband Electromechanical Spectroscopy (BES). For the specific apparatus developed, specimens are subjected to bending and torsional moments with frequencies up to 4 kHz and amplitudes up to 10^(−4) Nm (the method is sufficiently general to allow for higher and wider frequency ranges). Deflection/twist is measured and moments are applied in a contactless fashion to minimize the influence of the apparatus compliance and of spurious damping. Electric fields are applied to specimens via surface electrodes at frequencies up to 10 Hz and amplitudes up to 5 MV/m. Experiments are performed under vacuum to remove noise from the surrounding air. Using BES, the dynamic stiffness and damping in bending and torsion of a ferroelectric ceramic, lead zirconate titanate, were measured at room temperature, while applying large, cyclic electric fields to induce domain switching. Results reveal large increases of the specimen’s damping capacity and softening of the modulus during domain switching. The effect occurs over wide ranges of mechanical frequencies and permits lowering of the resonance frequencies. This promises potential for using ferroelectrics for active vibration control beyond linear piezoelectricity. More generally, BES helps improve current understanding of microstructure kinetics (such as during domain switching) and how it relates to the macroscopic viscoelastic response of materials.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1007/s10853-015-8928-xDOIArticle
http://link.springer.com/article/10.1007%2Fs10853-015-8928-xPublisherArticle
http://rdcu.be/ttdePublisherFree ReadCube access
ORCID:
AuthorORCID
Kochmann, D. M.0000-0002-9112-6615
Additional Information:© 2015 Springer Science+Business Media New York. Received: 9 December 2014; Accepted: 23 February 2015; Published online: 7 March 2015. The authors gratefully acknowledge financial support from United Technologies Research Center as well as from the Caltech Innovation Initiative (CI2).
Group:GALCIT
Funders:
Funding AgencyGrant Number
United Technologies Research CenterUNSPECIFIED
Caltech Innovation Initiative (CI2)UNSPECIFIED
Issue or Number:10
Record Number:CaltechAUTHORS:20150420-132839490
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150420-132839490
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56780
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Apr 2015 20:34
Last Modified:03 Oct 2019 08:17

Repository Staff Only: item control page