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Title of Journal: Exp Mech

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Abbravation: Experimental Mechanics

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Kluwer Academic Publishers-Plenum Publishers

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DOI

10.1016/j.acalib.2007.03.010

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1741-2765

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Tailoring Beam Mechanics Towards Enhancing Detecti

Authors: S Morshed BC Prorok
Publish Date: 2007/01/26
Volume: 47, Issue: 3, Pages: 405-415
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Abstract

Microcantilever based sensors have been widely employed for measuring or detecting various hazardous chemical agents and biological agents Although they have been successful in detecting agents of interest researchers desire to improve their performance by enhancing their mass sensitivity towards developing “detect to warn” detection capabilities Moreover there has been little work aimed at tailoring beam mechanics as a means to enhance mass sensitivity In this paper a numerical study is performed to assess the influence of microcantilever geometry on mass sensitivity in order to improve these devices for better detection of hazardous biological agents in liquid environments Modal analysis was performed on microcantilevers of different geometries and shapes using ANSYS software and compared to the basic rectangular shaped microcantilever structures employed by most researchers These structures all possessed a 50 μm length 05 μm thickness and 25 μm width where the cantilever is clamped to the substrate and were analyzed for their basic resonance frequency as well as the frequency shift for the attachment of a 0285 pg of mass attached on their surfaces These numerical results indicated that two parameters dominate their behavior 1 the effective mass of the cantilever at the free end and 2 the clamping width at the fixed end The ideal geometry was a triangular shape which minimized effective mass and maximized clamping width resulting in an order of magnitude increase in mass sensitivity 1775 Hz/pg over rectangular shaped cantilevers 172 Hz/pg of identical length and clamping width The most practical geometry was triangular shaped cantilever with a square pad at the free end for capturing the agent of interest This geometry resulted in a mass sensitivity of 628 Hz/pg or nearly a 4fold increase in performance over their rectangular counterparts


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  1. Internal Deformation Measurement of Polymer Bonded Sugar in Compression by Digital Volume Correlation of In - situ Tomography
  2. Dynamic Separation of Resistance Spot Welded Joints: Part II—Analysis of Test Results and a Model
  3. Hydrodynamic Interactions at Low Reynolds Number
  4. Impact of Experimental Uncertainties on the Identification of Mechanical Material Properties using DIC
  5. New Developments in Proton Radiography at the Los Alamos Neutron Science Center (LANSCE)
  6. A Tensile Split Hopkinson Bar for Testing Particulate Polymer Composites Under Elevated Rates of Loading
  7. Mechanical Properties of Ti-6Al-4V Selectively Laser Melted Parts with Body-Centred-Cubic Lattices of Varying cell size
  8. Hybrid Thermoelastic Stress Analysis of a Pinned Joint
  9. Experimental Testing of a Moving Force Identification Bridge Weigh-in-Motion Algorithm
  10. Sensitivity to Axial Stress of Electro-Mechanical Impedance Measurements
  11. Accuracy of the Sampling Moiré Method and its Application to Deflection Measurements of Large-Scale Structures
  12. Modification of the Shear-Compression Specimen for Large Strain Testing
  13. Analysis of Cracks and Deformations in a Full Scale Reinforced Concrete Beam Using a Digital Image Correlation Technique
  14. Slip Damping Mechanism in Welded Structures Using Response Surface Methodology
  15. Effect of Varying Test Parameters on Elastic–plastic Properties Extracted by Nanoindentation Tests
  16. Application of Digital Image Correlation (DIC) in Dynamic Notched Semi-Circular Bend (NSCB) Tests
  17. Experimental Methodology for Studying Strain Heterogeneity with Microstructural Data from High Temperature Deformation
  18. Strain Measurements Through Optimized Particle Tracking in Volumetric Images: Methodology and Error Assessment
  19. Comparison between Digital Fresnel Holography and Digital Image-Plane Holography: The Role of the Imaging Aperture
  20. Principle and Experimental Validation of a new Apparatus Allowing Large Deformation in Pure Bending: Application to thin Wire
  21. Dynamic Separation of Resistance Spot Welded Joints: Part I—Experiments
  22. Non-Newtonian Behavior of Ballistic Gelatin at High Shear Rates
  23. Designing a Uniaxial Tension/Compression Test for Springback Analysis in High-Strength Steel Sheets
  24. A Hybrid Wavelet Based–Approach and Genetic Algorithm to Detect Damage in Beam-Like Structures without Baseline Data

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