NANOMECHANICAL CHARACTERIZATION OF MULTIFERROIC THIN FILMS FOR MICRO-ELECTROMECHANICAL SYSTEMS

2011 ◽  
Vol 10 (04n05) ◽  
pp. 1039-1043 ◽  
Author(s):  
K. PRASHANTHI ◽  
M. MANDAL ◽  
S. P. DUTTAGUPTA ◽  
V. RAMGOPAL RAO ◽  
P. PANT ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Lead Zirconate Titanate ◽  
Young's Modulus ◽  
Lead Zirconate ◽  
Si Substrate ◽  
Electromechanical Systems ◽  
Multiferroic Films ◽  
First Time

In this paper, the elastic properties of Dy modified BiFeO3 (BDFO) multiferroic films deposited on Si substrate are reported for the first time. The mechanical properties are extracted using nanoindentation technique. The Young's modulus and hardness of the BDFO films are found to be 140 ± 3 GPa and 7.5 ± 0.3 GPa respectively. In this study the properties in the region of penetration depth up to 20% of BDFO film thickness, are found out. For these indentation depths, Young's modulus and hardness are almost constant indicating that substrate effects are not significant. It is also confirmed that neither cracks, nor pile-ups can be observed for indentation loads up to 10 mN. However, at higher indentation loads (>10 mN), bulging and spallation are observed suggesting delamination and buckling of the film. The mechanical properties of BDFO films are similar to that reported for lead zirconate titanate (PZT), while offering many novel properties. This report is accordingly expected to facilitate the design of BDFO-based micro-electromechanical systems devices.

Mechanical Characterization of Heterogeneous Polycrystalline Rocks Using Nanoindentation Method in Combination with Generalized Means Method

2020 ◽  
Vol 36 (6) ◽  
pp. 813-823
Author(s):  
M.R. Ayatollahi ◽  
M. Zare Najafabadi ◽  
S. S. R. Koloor ◽  
Michal Petrů
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Mechanical Characterization ◽  
Young's Modulus ◽  
Numerical Approach ◽  
Empirical Constant ◽  
Nanoindentation Experiment ◽  
Granite Rocks ◽  
Granite Samples

ABSTRACTThe mechanical characterization of rocks is important in engineering design and analysis of rock-related structures. In the current researches, rocks are classified as heterogeneous materials with anisotropic behavior, and advanced methods such as combined experimental-numerical approach are developed to characterize the behavior of rocks. In this study, the nanoindentation experiment in conjunction with the generalized means method is used to determine the Young’s modulus and hardness of eight different polycrystalline granite rocks. In the first step, the Young’s modulus and hardness of granites’ constituents are determined through nanoindentation tests on pure granite minerals. Then, the properties of granites are determined using generalized means method by considering the mechanical properties of minerals, their volume fractions and an empirical constant called the microstructural coefficient. Accurate results with less than 3% error are obtained for 62.5% of the granite samples. The generalized means is introduced as a simple and effective method to characterize the mechanical properties of heterogeneous polycrystalline rocks.

scholarly journals Performance Improvement of Ring-Type PZT Ceramics for Ultrasonic Dispersion System

Micromachines ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 144 ◽  
Author(s):  
Young Min Choi ◽  
Yang Lae Lee ◽  
Eui Su Lim ◽  
Mojiz Abbas Trimzi ◽  
Seon Ae Hwangbo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Lead Zirconate Titanate ◽  
Lead Zirconate ◽  
Ultrasonic Dispersion ◽  
Pzt Ceramics ◽  
Ring Type ◽  
Molding Method ◽  
Dispersion System ◽  
Lower Heating

This study has been based on the examination of the characterization of ring-type lead zirconate titanate (PZT) ceramics for high-intensity focused ultrasonic dispersion system. The ring-type PZT ceramics were fabricated by the powder molding method. The mechanical properties, dielectric constant, and microstructure of the ceramics were investigated. Consequently, the density of the ceramics was increased with increasing forming pressure while the density of ceramics that were sintered at 1350 °C was decreased due to over-sintering. Furthermore, the mechanical properties were excellent at the higher forming pressure. The dielectric property of the ring-type PZT ceramics was not clearly influenced by the manufacturing and sintering conditions. The abnormal grain growth of the ceramics, however, could be prevented by a lower heating rate in addition to reducing the porosity.

Microscopic Methods for Characterization of Selected Surface Properties of Biodegradable, Nanofibrous Tissue Engineering Scaffolds

2017 ◽  
Vol 890 ◽  
pp. 213-216 ◽  
Author(s):  
Adrian Chlanda ◽  
Ewa Kijeńska ◽  
Wojciech Święszkowski
Keyword(s):  
Mechanical Properties ◽  
Tissue Engineering ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Force Spectroscopy ◽  
Operating Mode ◽  
Tissue Engineering Scaffolds ◽  
Force Microscopy ◽  
Atomic Force

Biodegradable polymeric fibers with nanoand submicron diameters, produced by electrospinning can be used as scaffolds in tissue engineering. It is necessary to characterize their mechanical properties especially at the nanoscale. The Force Spectroscopy is suitable atomic force microscopy mode, which allows to probe mechanical properties of the material, such as: reduced Young's modulus, deformation, adhesion, and dissipation. If combined with standard operating mode: contact or semicontact, it will also provide advanced topographical analysis. In this paper we are presenting results of Force Spectroscopy characterization of two kinds of electrospun fibers: polycaprolactone and polycaprolactone with hydroxyapatite addition. The average calculated from Johnson-Kendall-Roberts theory Young's modulus was 4 ± 1 MPa for pure polymer mesh and 20 ± 3 MPa for composite mesh.

Study of Printing Orientation on Mechanical Properties in Additive Manufacturing Process

2019 ◽  
Author(s):  
Peyman Honarmandi ◽  
Hongbin Xu
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Young’S Modulus ◽  
Manufacturing Process ◽  
Young's Modulus ◽  
Innovative Technology ◽  
Build Orientation ◽  
Fused Deposition ◽  
3D Printed

Abstract Additive manufacturing (AM) is an innovative technology that creates parts by adding small portions of materials layer by layer, which frees designers to create parts that were not possible to manufacture with subtractive manufacturing processes previously. This led to wide-spread popularity of 3D-printing technology. In this technology. fused deposition modeling (FDM) is the most affordable one in the market now. Therefore, it is vital to understand how the print orientation, which can be customized very easily, affects the mechanical properties of the prints to maximize the strength of the product. This paper aims to present the methodology and results of the experimental characterization of the acrylonitrile butadiene styrene (ABS) 3D-printed part. Tensile characterization of ABS was performed to analyze anisotropic nature of 3D-printed parts caused by its unique manufacturing process. Specimens were printed with six different configurations: four raster ([45/−45], [30/−60], [15/−75] and [0/90]) and three build orientations (0 or flat, 45, and 90 degrees with respect to the build plate, all printed in [45/−45] raster orientation). Dogbone tensile specimens were printed and pulled using the tensile test machine. The young’s modulus, yield strength, ultimate strength, strain at failure, breaking strength were found for each configuration. As the build orientation angle increased and the raster orientation goes from [45/−45] to [0/90], mechanical properties decreased steadily except the Young’s modulus. For build orientation, Young’s modulus decreased first then increased as angle increased, and for the raster orientation, there was no statistically significant difference as raster changed from [45/−45] to [0/90]. Overall, [45/−45] flat configuration is the strongest and the most stable configuration.

Quantitative Contact Spectroscopy and Imaging by Atomic-Force Acoustic Microscopy

1999 ◽  
Vol 591 ◽  
Author(s):  
W. Arnold ◽  
S. Amelio ◽  
S. Hirsekorn ◽  
U. Rabe
Keyword(s):  
Young’S Modulus ◽  
Lead Zirconate Titanate ◽  
Young's Modulus ◽  
Contact Stiffness ◽  
Near Field ◽  
Lead Zirconate ◽  
Acoustic Microscopy ◽  
Atomic Force ◽  
Resonance Frequencies ◽  
Nanocrystalline Ferrite

ABSTRACTAtomic Force Acoustic Microscopy is a near-field technique which combines the ability in using ultrasonics to image elastic properties with the high lateral resolution of scanning probe microscopes. We present a technique to measure the contact stiffness and the Young's modulus of sample surfaces quantitatively with a resolution of approximately 20 rum exploiting the contact resonance frequencies of standard cantilevers used in Atomic Force Microscopy. The Young's modulus of nanocrystalline ferrite films have been measured as a function of oxidation temperature. Furthermore images showing the domain structure of piezoelectric lead zirconate titanate ceramics have been taken.

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.

Nanoindentation Characterization of Mechanical Properties of Ferrite and Austenite in Duplex Stainless Steel

2007 ◽  
Vol 26-28 ◽  
pp. 1165-1170 ◽  
Author(s):  
Xiu Fang Wang ◽  
Xiao Ping Yang ◽  
Zhen Dan Guo ◽  
Yin Chang Zhou ◽  
Hong Wei Song
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Hot Forging ◽  
Sample Surface ◽  
Cast Sample ◽  
The Difference

The mechanical properties of as-cast and hot-forging duplex stainless steel samples with the same compositions were characterized by nanoindentation. The effect of surface treating method and working state of the sample on the nanoindentation results of ferrite and austenite were discussed. The results show that the Young’s modulus and hardness of ferrite and austenite may be affected by the treating method of sample surface. The difference of Young’s modulus average of ferrite or austenite between as-cast and hot-forging duplex stainless steel samples is not great, but the hardness average of ferrite or austenite in hot-forging sample is obviously higher than those of as-cast sample. The difference of hardness between ferrite and austenite in the same sample is not great, but the young’s modulus of ferrite is higher than that of austenite.

New Method to Determine Young’s Modulus of Micro Crystal Based on Raman Spectrometer

2008 ◽  
Vol 272 ◽  
pp. 1-6
Author(s):  
Sheng Bo Sang
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Frequency Measurement ◽  
High Accuracy ◽  
Tension Test ◽  
Bulge Test ◽  
Bending Tests ◽  
Beam Bending

With the development of MEMS, the mechanical properties of micro crystals must to be determined to know the defect, reliability and characterization of MEMS. Young’s modulus is one of the most important properties, which indicates the ability of resisting the elastic deformation. Many methods, such as natural frequency measurement, beam bending tests, membrane bulge test and uniaxial tension test, have been used to measure Young’s modulus of Si, SiN and metals. But there are some limitations when they are used to measure micro crystals in MEMS. This paper puts forward a high accuracy and convenient method----using Raman spectrum to measure Young’s modulus of micro crystals in MEMS, and sets up the measurement system. Measured Young’s modulus of Si and GaAs in [100] crystallographic orientation are 161.113GPa and 84.128GPa respectively, which correspond with the Yong’s modulus in common use now. Based on the values, it can be analyzed if there are some defects in the micro crystals.

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