Journal article
Soft-materials elastic and shear moduli measurementusing piezoelectric cantilevers
Review of scientific instruments, v 76(6), pp 064302-064302-7
23 May 2005
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
We have developed a soft-material elastic modulus and shear modulus sensor using piezoelectric cantilevers. A piezoelectric cantilever is consisted of a highly piezoelectric layer, e.g., lead-zirconate-titanate bonded to a nonpiezoelectric layer, e.g., stainless steel. Applying an electric field in the thickness direction causes a piezoelectric cantilever to bend, generating an axial displacement or force. When a piezoelectric cantilever is in contact with an object, this electric field-generated axial displacement is reduced due to the resistance by the object. With a proper design of the piezoelectric cantilever's geometry, its axial displacements with and without contacting the object could be accurately measured. From these measurements the elastic modulus of the object can be deduced. In this study, we tailored the piezoelectric cantilevers for measuring the elastic and shear moduli of tissue-like soft materials with forces in the submilli Newton to milliNewton range. Elastic moduli and shear moduli of soft materials were measured using piezoelectric cantilevers with a straight tip and an L-shaped tip, respectively. Using gelatin and commercial rubber material as model soft tissues, we showed that a piezoelectric cantilever
1.5
-
2
cm
long could measure the elastic modulus and the shear modulus of a small soft material sample (
1
-
3
mm
wide) in the small strain range
(
<
1
%
)
. For samples
5
mm
high, the resultant compressive (shear) strains were less than 0.5% (1%). The measurements were validated by (1) comparing the measured Young's modulus of the commercial rubber sample with its known value and (2) by measuring both the Young's modulus and shear modulus on the samples and confirming the thus deduced Poisson's ratios with the separately measured Poisson's ratios.
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Details
- Title
- Soft-materials elastic and shear moduli measurementusing piezoelectric cantilevers
- Creators
- Anna Markidou - Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104Wan Shih - Drexel UniversityWei-Heng Shih - Drexel University
- Publication Details
- Review of scientific instruments, v 76(6), pp 064302-064302-7
- Publisher
- American Institute of Physics
- Grant note
- 1 R01 EB00720 / NH
- Resource Type
- Journal article
- Academic Unit
- School of Biomedical Engineering, Science, and Health Systems; Materials Science and Engineering
- Web of Science ID
- WOS:000229962000084
- Scopus ID
- 2-s2.0-20644444994
- Other Identifier
- 991019167595504721
UN Sustainable Development Goals (SDGs)
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Instruments & Instrumentation
- Physics, Applied