Towards Measuring Young’s Modulus by Electronic Probing

2012 ◽  
Author(s):  
Aarti Chigullapalli ◽  
Jason V. Clark
Keyword(s):  
Young’S Modulus ◽  
Computer Model ◽  
Young's Modulus ◽  
Dynamic Performance ◽  
Comb Drive ◽  
Comb Drives ◽  
Electronic Measurement ◽  
On Chip ◽  
True Experiment ◽  
Good Agreement

We propose an accurate and precise method for measuring the Young’s modulus of MEMS with comb drives by electronic probing of capacitance. The electronic measurement can be performed off-chip for quality control or on-chip after packaging for self-calibration. Young’s modulus is an important material property that affects the static or dynamic performance of MEMS. Electrically-probed measurements of Young’s modulus may also be useful for industrial scale automation. Conventional methods for measuring Young’s modulus include analyzing stress-strain curves, which is typically destructive, or include analyzing a large array of test structures of varying dimensions, which requires a large amount of chip real estate. Our method measures Young’s modulus by uniquely eliminating unknowns and extracting the fabricated geometry, displacement, comb drive force, and stiffness. Since Young’s modulus is related to geometry and stiffness that we find using electronic measurands, we are able to express Young’s modulus as a function of electronic measurands. We verify our method by using it to predict the Young’s modulus of a computer model. We treat the computer model as we would treat a true experiment by depending only on its electronic measurands. We find good agreement in predicting the exactly known Young’s modulus in a computer model within 0.1%.

scholarly journals On-chip pressure measurements and channel deformation after oil absorption

2020 ◽  
Vol 2 (9) ◽  
Author(s):  
Liam Hunter ◽  
Julia Gala de Pablo ◽  
Ashley C. Stammers ◽  
Neil H. Thomson ◽  
Stephen D. Evans ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Flow Rate ◽  
Young's Modulus ◽  
Pressure Profile ◽  
Mineral Oil ◽  
Microfluidic Channels ◽  
Oil Absorption ◽  
Channel Deformation ◽  
Before And After ◽  
On Chip

Abstract Microfluidic channels moulded from the soft polymer poly(dimethylsiloxane) (PDMS) are widely used as a platform for mimicking biological environments, and can be used for the simulation of fluid filled structures such as blood and lung vessels. The control of pressure and flow rate within these structures is vital to mimic physiological conditions. The flexibility of PDMS leads to pressure-induced deformation under flow, leading to variable flow profiles along a device. Here, we investigate the change in Young’s modulus of microfluidic channels due to infiltration of mineral oil, a PDMS permeable fluid, and how this affects the resulting pressure profile using a novel pressure measurement method. We found a 53% decrease in Young’s modulus of PDMS due to mineral oil absorption over the course of 3 h accounted for lower internal pressure and larger channel deformation compared to fresh PDMS at a given flow rate. Confocal fluorescence microscopy used to image channel profiles before and after the introduction of mineral oil showed a change in pressure-induced deformation after infiltration of the oil. Atomic force microscopy (AFM) nanoindentation was used to measure Young’s modulus of PDMS before ($$2.80 \pm 0.03$$ 2.80 ± 0.03 MPa) and after ($$1.32 \pm 0.04$$ 1.32 ± 0.04 MPa) mineral oil absorption. Raman spectroscopy showed the infiltration of mineral oil into PDMS from channel walls and revealed the diffusion coefficient of mineral oil in PDMS.

Direct Tensile Tests of Individual WS2 Nanotubes

2005 ◽  
Vol 475-479 ◽  
pp. 4097-4102 ◽  
Author(s):  
I. Kaplan-Ashiri ◽  
S.R. Cohen ◽  
K. Gartsman ◽  
R. Rosentsveig ◽  
V. Ivanovskaya ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Tight Binding ◽  
Md Simulations ◽  
Tensile Tests ◽  
Average Value ◽  
Atomic Force ◽  
Direct Tensile ◽  
Single Wall Nanotubes ◽  
Good Agreement

The Young’s modulus of WS2 nanotubes is an important property for various applications. Measurements of the mechanical properties of individual nanotubes are challenging because of the small size of the tubes. Lately, measurements of the Young’s modulus by buckling of an individual nanotube using an atomic force microscope1 resulted in an average value of 171GPa. Tensile tests of individual WS2 nanotubes were performed experimentally using a scanning electron microscope and simulated tensile tests of MoS2 nanotubes were performed by means of a densityfunctional tight-binding (DFTB) based molecular dynamics (MD) scheme. Preliminary results for WS2 nanotubes show Young’s modulus value of ca.162GPa, tensile strength value of ca. 13GPa and average elongation of ca. 12%. MD simulations resulted in elongation of 19% for zigzag and 17% for armchair MoS2 single wall nanotubes. Since MoS2 and WS2 nanotubes have similar structures the same behavior is expected for both, hence there is a good agreement regarding the elongation of WS2 nanotubes between experiment and simulation.

Elasticity of a percolation system: silica smoke

1987 ◽  
Vol 65 (7) ◽  
pp. 767-771 ◽  
Author(s):  
J. Forsman ◽  
J. P. Harrison ◽  
A. Rutenberg
Keyword(s):  
Fractal Dimension ◽  
Percolation Threshold ◽  
Young’S Modulus ◽  
Volume Fraction ◽  
Young's Modulus ◽  
Silica Spheres ◽  
Aggregate Model ◽  
Bond Bending ◽  
Good Agreement ◽  
Percolation Structure

Cab-O-Sil powder is a cluster aggregate of silica spheres formed from silica smoke. The fractal dimension of clusters of 14 nm diameter spheres is determined to be [Formula: see text], in good agreement with that calculated for the cluster-aggregate model, [Formula: see text]. Measurements of Young's modulus (Y) of packed 7 nm Cab-O-Sil powder, with an occupied volume fraction in the range 0.035 < f < 0.3, are well described by the percolation threshold fc = 0.017 ± 0.002 and an elasticity exponent τ = 2.9 ± 0.2. The measured exponent is larger than the calculated scalar Born (balls and springs) result, τ = 2.0, but smaller than the more realistic bond-bending result, τ > 3.55. The measured result is attributed to bond bending within a complex percolation structure.

Properties of Cu-TiB2 Composites Fabricated by In-Situ Liquid Melt Mixing Process

2006 ◽  
Vol 15-17 ◽  
pp. 215-219 ◽  
Author(s):  
J.H Yun ◽  
J.H. Kim ◽  
J.S. Park ◽  
Young Do Park ◽  
Yong Ho Park ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Mixing Process ◽  
Melt Mixing ◽  
Maximum Value ◽  
S Model ◽  
Good Agreement

A Cu-TiB2 composite was successfully fabricated by in-situ liquid mixing process, and its microstructure, mechanical properties as well as electrical conductivity were evaluated. For Cu-2vol.%TiB2 composite, the hardness was as high as 5GPa and the Young’s modulus was 130GPa. And hardness and Young’s modulus of Cu-6vol.%TiB2 composite was 5.6Gpa and 138GPa, respectively. With the increase of the TiB2 content, hardness and Young’s modulus of Cu-10vol.%TiB2 composite were 20 and 12%, respectively, which was higher than that of Cu-2vol.%TiB2 composite. Young’s modulus of the Cu-TiB2 composite in this paper was in good agreement with the prediction by Hashin-Shtrikman (H-S) model. Furthermore, the electrical conductivity of the Cu-TiB2 composite showed its maximum value of about 78%IACS and decreased with the increase of the TiB2.

scholarly journals Тестирование на изгиб наноразмерных консолей в атомно-силовом микроскопе

2022 ◽  
Vol 48 (3) ◽  
pp. 24
Author(s):  
А.В. Анкудинов ◽  
М.М. Халисов
Keyword(s):  
Atomic Force Microscope ◽  
Young’S Modulus ◽  
Elastic Foundation ◽  
Test Data ◽  
Young's Modulus ◽  
Atomic Force ◽  
Good Agreement

Consoles and bridges of MgNi2Si2O5(OH)4 nanoscrolls were tested for bending in atomic force microscope. Using test data, we analyze how the consoles or bridges were fixed, and took this information into account when calculating the Young's modulus of the nanoscrolls. The results on the consoles are in good agreement with the results on the bridges when modeling the latter as three-span beams, and the former as beams on an elastic foundation with a suspended console.

Measuring anisotropy in Young’s modulus of copper using microcantilever testing

2009 ◽  
Vol 24 (11) ◽  
pp. 3268-3276 ◽  
Author(s):  
David E.J. Armstrong ◽  
Angus J. Wilkinson ◽  
Steve G. Roberts
Keyword(s):  
Young’S Modulus ◽  
Focused Ion Beam ◽  
Young's Modulus ◽  
Ion Beam ◽  
Copper Sample ◽  
Critical Aspect ◽  
Electron Backscattered Diffraction ◽  
Single Grain ◽  
Fixed End ◽  
Good Agreement

Focused ion beam machining was used to manufacture microcantilevers 30 μm by 3 μm by 4 μm with a triangular cross section in single crystal copper at a range of orientations between. These were imaged and tested using AFM/nanoindentation. Each cantilever was indented multiple times at a decreasing distance away from the fixed end. Variation of the beam’s behavior with loading position allowed a critical aspect ratio (loaded length:beam width) of 6 to be identified above which simple beam approximations could be used to calculate Young’s modulus. Microcantilevers were also milled within a single grain in a polycrystalline copper sample and electron backscattered diffraction was used to identify the direction of the long axis of the cantilever. The experimentally measured values of Young’s modulus and their variation with orientation were found to be in good agreement with the values calculated from the literature data for bulk copper.

Random Bulk Properties of Heterogeneous Rectangular Blocks With Lognormal Young's Modulus: Effective Moduli

2015 ◽  
Vol 82 (1) ◽  
Author(s):  
Leon S. Dimas ◽  
Daniele Veneziano ◽  
Tristan Giesa ◽  
Markus J. Buehler
Keyword(s):  
Young’S Modulus ◽  
Elastic Properties ◽  
Young's Modulus ◽  
Three Dimensional ◽  
Heterogeneous Materials ◽  
Effective Elastic Properties ◽  
Specific Effects ◽  
Spatial Fluctuations ◽  
2D And 3D ◽  
Good Agreement

We investigate the effective elastic properties of disordered heterogeneous materials whose Young's modulus varies spatially as a lognormal random field. For one-, two-, and three-dimensional (1D, 2D, and 3D) rectangular blocks, we decompose the spatial fluctuations of the Young's log-modulus F=lnE into first- and higher-order terms and find the joint distribution of the effective elastic tensor by multiplicatively combining the term-specific effects. The analytical results are in good agreement with Monte Carlo simulations. Through parametric analysis of the analytical solutions, we gain insight into the effective elastic properties of this class of heterogeneous materials. The results have applications to structural/mechanical reliability assessment and design.

Characterization of size-dependent mechanical properties of tip-growing cells using a lab-on-chip device

Lab on a Chip ◽  
2017 ◽  
Vol 17 (1) ◽  
pp. 82-90 ◽  
Author(s):  
Chengzhi Hu ◽  
Gautam Munglani ◽  
Hannes Vogler ◽  
Tohnyui Ndinyanka Fabrice ◽  
Naveen Shamsudhin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Wall ◽  
Young’S Modulus ◽  
Microfluidic Device ◽  
Young's Modulus ◽  
Turgor Pressure ◽  
Lab On Chip ◽  
Size Dependent ◽  
On Chip

A microfluidic device can trap and indent tip-growing cells for quantification of turgor pressure and cell wall Young's modulus.

An Investigation on the Effect of Sonication Time and Dispersing Medium on the Mechanical Properties of MWCNT/Epoxy Nanocomposites

2011 ◽  
Vol 264-265 ◽  
pp. 1954-1959 ◽  
Author(s):  
Arash Montazeri ◽  
Alireza Khavandi ◽  
Jafar Javadpour ◽  
Abbas Tcharkhtchi
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Solvent System ◽  
Sonication Time ◽  
Nanocomposite System ◽  
Dispersion State ◽  
Dispersing Medium ◽  
Good Agreement

This work studied the effect of sonication time and dispersing medium on the dispersion state of 0.1%wt multi-wall carbon nanotube (MWCNT) in the MWCNT/epoxy nanocomposite system. Epoxy, hardener, and epoxy/solvent were used as dispersing mediums in this study. Tensile strength, strain at failure, Young's modulus and fracture toughness were measured under different dispersion state of MWCNT. The results indicate that with the increase in sonication time, initially there was an increase in tensile strength and fracture toughness values which was followed by a drop in values at longer sonication times. The highest Young's modulus values were seen in epoxy dispersion and the highest tensile strength and fracture toughness values were observed when the hardener was used as dispersing medium. The results also indicated that the effect of sonication time was more pronounced in the case of epoxy dispersion. The effect of time was least when the epoxy / solvent system was used as CNT dispersing medium. It should also be pointed out that the Young's modulus for the nanocomposite sample obtained after 1h of dispersion in hardener showed good agreement with a modified Halpin-Tsai theory. The scanning electron microscope (SEM) was used to characterize the dispersion state of MWCNT. A good dispersion was obtained when either hardener or solvent were selected as the dispersing medium.

Property Modification of 3C-SiC MEMS on Ge-Modified Si(100) Substrates

2010 ◽  
Vol 645-648 ◽  
pp. 861-864 ◽  
Author(s):  
Florentina Niebelschütz ◽  
Wei Hong Zhao ◽  
Klemens Brueckner ◽  
Katja Tonisch ◽  
Matthias Linß ◽  
...  
Keyword(s):  
Residual Stress ◽  
Young’S Modulus ◽  
Microelectromechanical Systems ◽  
Young's Modulus ◽  
Growth Conditions ◽  
Quality Factors ◽  
Growth Changes ◽  
Property Modification ◽  
Good Agreement

The manipulation of nucleation and growth conditions with Ge deposition prior to the carbonization and epitaxial growth changes the residual stress and the material quality of 3C-SiC(100)-layers grown on Si(100). This enables the modification of quality factor and resonant frequency of microelectromechanical systems (MEMS) based on 3C-SiC-layers. Measured resonant frequencies and quality factors of the magnetomotively actuated MEMS exhibit a dependence on the Ge amount at the interface of the Si/SiC heterostructure. This offers a degree of freedom to adjust the MEMS properties within a certain range to the requirements necessary for specific applications. The observed dependencies of the Young’s modulus are in good agreement with the trends of residual stress and Young’s modulus, which were determined on as grown 3C-SiC(100):Ge samples by fourier transform infrared (FTIR) spectroscopy and nanoindentation.

Sign in / Sign up

Export Citation Format

Share Document