Size- and temperature-dependent Young's modulus of SiC nanowires determined by a laser-Doppler vibration measurement

2021 ◽  
Vol 118 (4) ◽  
pp. 043103
Author(s):  
Tursunay Yibibulla ◽  
Yijun Jiang ◽  
Shiliang Wang ◽  
Han Huang
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Laser Doppler ◽  
Vibration Measurement ◽  
Temperature Dependent ◽  
Sic Nanowires

Temperature coefficient of Young’s modulus of silver microwhiskers determined by a laser Doppler vibration measurement

2021 ◽  
pp. 2150350
Author(s):  
Yijun Jiang ◽  
Mingyuan Lu ◽  
Shiliang Wang ◽  
Han Huang
Keyword(s):  
Temperature Dependence ◽  
Temperature Coefficient ◽  
Single Crystals ◽  
Young’S Modulus ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Young's Modulus ◽  
Laser Doppler Vibrometer ◽  
Laser Doppler ◽  
Vibration Measurement

Temperature dependence of Young’s modulus of Ag microwhiskers was determined by a laser Doppler vibrometer. The Ag whiskers with diameters in sub-microns were synthesized by the use of physical vapor deposition (PVD). They have a five-fold twinned structure grown along the [1 1 0] direction. The temperature coefficient of Young’s modulus was measured to be [Formula: see text] ppm/K in the range of 300 K to 650 K. The measured values are very close to the reported values of [Formula: see text] ppm/K for bulk Ag single crystals. This finding can benefit the design of Ag-based micro/nano-electromechanical systems or micro/nano-interconnectors operated at elevated or lowered temperatures.

Size- and temperature-dependent Young's modulus and size-dependent thermal expansion coefficient of thin films

2016 ◽  
Vol 18 (31) ◽  
pp. 21508-21517 ◽  
Author(s):  
Xiao-Ye Zhou ◽  
Bao-Ling Huang ◽  
Tong-Yi Zhang
Keyword(s):  
Thin Films ◽  
Thermal Expansion ◽  
Young’S Modulus ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Material Properties ◽  
Essential Role ◽  
Young's Modulus ◽  
Temperature Dependent ◽  
Size Dependent

Surfaces of nanomaterials play an essential role in size-dependent material properties.

Temperature dependent Young’s modulus of ZnO nanowires

2018 ◽  
Vol 30 (6) ◽  
pp. 065705 ◽  
Author(s):  
Aditi Roy ◽  
Shin-pon Ju ◽  
Shiliang Wang ◽  
Han Huang
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Zno Nanowires ◽  
Temperature Dependent

TENSILE BEHAVIOR OF AMORPHOUS LAYER COATED SILICON CARBIDE NANOWIRES: AN ATOMIC SIMULATION

2011 ◽  
Vol 25 (05) ◽  
pp. 325-332 ◽  
Author(s):  
DENGFENG LI ◽  
ZHIGUO WANG
Keyword(s):  
Young’S Modulus ◽  
Critical Stress ◽  
Young's Modulus ◽  
Large Diameter ◽  
Amorphous Layer ◽  
Tensile Behavior ◽  
Amorphous Coating ◽  
Atomic Simulation ◽  
Sic Nanowires ◽  
Layer Coating

The tensile behavior of amorphous layer coated SiC nanowires was investigated using molecular dynamics with Tersoff potential at room temperature. Simulation results show that the amorphous layer coating leads to the decrease of the critical stress and Young's modulus, but does not affect the fracture mode of nanowires with large diameter and thin coating layer. The decrease of critical stress and Young's modulus can be attributed to the weakening of the Si – C bonds in the amorphous coating layers.

A Theoretical and Experimental Study on Temperature Dependent Characteristics of Silicon MEMS Gyroscope Drive Mode

2011 ◽  
Vol 403-408 ◽  
pp. 4237-4243 ◽  
Author(s):  
Rui Feng ◽  
An Ping Qiu ◽  
Qin Shi ◽  
Yan Su
Keyword(s):  
Temperature Coefficient ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Critical Factor ◽  
Temperature Dependent ◽  
Drive Mode ◽  
Modal Frequency ◽  
Mems Gyroscope ◽  
Key Factor ◽  
Theoretical Results

The prototype of the silicon micro gyroscope is introduced. Temperature is the key factor that affects the performance of the gyroscope. In this paper, temperature dependent characteristics of silicon micro gyroscope drive mode is analyzed. The theoretical results show that temperature coefficient of the Young’s modulus is the most critical factor that affects temperature characteristics of the silicon micro gyroscope’s drive modal frequency and the frequency is proportional to the temperature. The results are verified by finite element simulations. The silicon micro gyroscopes are experimented in a high accurate thermostat. The drive modal frequency and temperature are measured and sampled. These experimental results show that the temperature coefficient of Young’s modulus is the key factor and the frequency is proportional to the temperature. The theoretic analyses are also validated by the experiments.

scholarly journals Experimental Characterization and Modeling Multifunctional Properties of Epoxy/Graphene Oxide Nanocomposites

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2831
Author(s):  
Naresh Kakur ◽  
Kamran A. Khan ◽  
Rehan Umer
Keyword(s):  
Thermal Conductivity ◽  
Graphene Oxide ◽  
Young’S Modulus ◽  
Poisson’S Ratio ◽  
Young's Modulus ◽  
Image Correlation ◽  
Poisson's Ratio ◽  
Mechanical And Thermal Properties ◽  
Temperature Dependent ◽  
Frequency Temperature

Thermomechanical modeling of epoxy/graphene oxide under quasi-static and dynamic loading requires thermo-mechanical properties such as Young’s modulus, Poisson’s ratio, thermal conductivity, and frequency-temperature dependent viscoelastic properties. In this study, the effects of different graphene oxide (GO) concentrations (0.05, 0.1, and 0.2 wt%) within an epoxy matrix on several mechanical and thermal properties were investigated. The distribution of GO fillers in the epoxy was investigated using transmission electron microscopy (TEM). The digital image correlation (DIC) technique was employed during the tensile testing to determine Young’s modulus and Poisson’s ratio. Analytical models were used to predict Young’s modulus and thermal conductivity, with an error of less than 13% and 9%, respectively. Frequency–temperature dependent phenomenological models were proposed to predict the storage moduli and loss tangent, with a reasonable agreement with experimental data. A relatively high storage modulus, heat-resistance index (THRI), and thermal conductivity were observed in 0.2 wt% nanocomposite samples compared with pure epoxy and other lower concentration GO nanocomposites. A high THRI and derivative of thermogravimetric analysis peak temperatures (Tm1 and Tm2) were exhibited by adding nano-fillers in the epoxy, which confirms higher thermal stability of nanocomposites than that of pristine epoxy.

Thermal Stresses During Solidification on Basis of Elastic Model

1969 ◽  
Vol 36 (4) ◽  
pp. 763-767 ◽  
Author(s):  
R. H. Tien ◽  
V. Koump
Keyword(s):  
Young’S Modulus ◽  
Thermal Stresses ◽  
Young's Modulus ◽  
Linear Thermal Expansion ◽  
Solidification Process ◽  
Elastic Model ◽  
Transverse Displacement ◽  
Temperature Dependent ◽  
Simply Supported ◽  
Horizontal Beam

Distributions of stress and displacement in a slab during a solidification process are obtained analytically using the model of an elastic horizontal beam with temperature-dependent Young’s modulus. Both simply supported and built-in ends are considered as the boundary condition for the beam. In addition to the physical properties such as coefficient of linear thermal expansion, density, expression of Young’s modulus, etc., the main parameters determining the stress and displacement involve the mode of cooling at the surface and the external force acting on the liquid-solid interface such as the hydrostatic head from liquid side. Some specific results are presented to illustrate the effect of cooling rate and the dimensions of the beam on development of thermal stress and transverse displacement during solidification of iron.

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