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Timoshenko beam effects in lateral‐mode microcantilever‐based sensors in liquids
- Source :
- Micro and Nano Letters, Micro and Nano Letters, Institution of Engineering and Technology, 2013, 8 (11), pp.762-765. ⟨10.1049/mnl.2013.0395⟩
- Publication Year :
- 2013
- Publisher :
- Institution of Engineering and Technology (IET), 2013.
-
Abstract
- Recent experimental and analytical research has shown that higher in-fluid quality factors (Q) are achieved by actuating microcantilevers in the lateral flexural mode, especially for microcantilevers having larger width-to-length ratios. However, experimental results show that for these geometries the resonant characteristics predicted by the existing analytical models differ from the measurements. A recently developed analytical model to more accurately predict the resonant behaviour of these devices in viscous fluids is described. The model incorporates viscous fluid effects via a Stokes-type fluid resistance assumption and ‘Timoshenko beam’ effects (shear deformation and rotatory inertia). Unlike predictions based on Euler-Bernoulli beam theory, the new theoretical results for both resonant frequency and Q exhibit the same trends as seen in the experimental data for in-water measurements as the beam slenderness decreases. An analytical formula for Q is also presented to explicitly illustrate how Q depends on beam geometry and on beam and fluid properties. Beam thickness effects are also examined and indicate that the analytical results yields good numerical estimates of Q for the thinner (5 μm) specimens tested, but overestimate Q for the thicker (20 μm) specimens, thus suggesting that a more accurate fluid resistance model should be introduced in the future for the latter case.
- Subjects :
- Timoshenko beam theory
Materials science
Cantilever
[SPI.NANO] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics
Biomedical Engineering
Bioengineering
02 engineering and technology
Mechanics
Viscous liquid
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
0104 chemical sciences
Physics::Fluid Dynamics
Shear modulus
Quality (physics)
Classical mechanics
Flexural strength
Drag
General Materials Science
[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics
0210 nano-technology
ComputingMilieux_MISCELLANEOUS
Beam (structure)
Subjects
Details
- ISSN :
- 17500443
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- Micro & Nano Letters
- Accession number :
- edsair.doi.dedup.....392984ae1de000b6f80d0450cac60639