Elastic moduli and internal friction in Al2O3-3Y-ZrO2 composites by ultrasonic pulse technique

1995 ◽  
Vol 14 (9) ◽  
pp. 643-645
Author(s):  
T. Ono ◽  
T. Okada ◽  
O. Sakurada ◽  
M. Hashiba ◽  
Y. Nurishi ◽  
...  
Keyword(s):  
Internal Friction ◽  
Elastic Moduli ◽  
Ultrasonic Pulse ◽  
Pulse Technique

An Experimental Study of Dispersion of Stress Waves in a Fiber-Reinforced Composite

1972 ◽  
Vol 39 (1) ◽  
pp. 98-102 ◽  
Author(s):  
T. R. Tauchert ◽  
A. N. Guzelsu
Keyword(s):  
Elastic Moduli ◽  
Epoxy Composite ◽  
Ultrasonic Pulse ◽  
Stress Waves ◽  
Transverse Waves ◽  
Pulse Technique ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
First Approximation ◽  
Static Elastic Moduli

An ultrasonic pulse technique was used to investigate the dispersive behavior of plane harmonic waves in a boron-epoxy composite. The dependence of group velocity upon frequency is determined for longitudinal and transverse waves propagating either parallel or perpendicular to the fibers. The static elastic moduli for the composite are also obtained, and to a first approximation the material is found to be tetragonal.

scholarly journals Comprehensive Study on Elastic Moduli Prediction and Correlation of Glass and Glass Ceramic Derived from Waste Rice Husk

2017 ◽  
Vol 2017 ◽  
pp. 1-10
Author(s):  
Chee Sun Lee ◽  
Khamirul Amin Matori ◽  
Sidek Hj. Ab Aziz ◽  
Halimah Mohamed Kamari ◽  
Ismayadi Ismail ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Rice Husk ◽  
Poisson’S Ratio ◽  
Elastic Moduli ◽  
Direct Calculation ◽  
Ultrasonic Pulse ◽  
Poisson's Ratio ◽  
Longitudinal Modulus ◽  
Pulse Echo ◽  
Quench Method

Zinc silicate (ZnO–SiO2) systems were fabricated using zinc oxide (ZnO) and white rice husk ash (WRHA) with compositions of (ZnO)x(WRHA)1−x (x = 0.55, 0.60, 0.65, and 0.70 wt.%) was symbolized by S1, S2, S3, and S4, respectively. The ZnO–SiO2 samples were fabricated by applying the melt-quench method and the physical and elastic properties of the samples were investigated. Physical properties used in this study are density and molar volume while the theoretical elastic moduli of the samples produced were obtained using direct calculation of theoretical model compared with the experimental elastic moduli obtained by acquiring ultrasonic velocities using ultrasonic pulse-echo technique. Values of experimental elastic moduli including longitudinal modulus (L), shear modulus (S), Young’s modulus (E), bulk modulus (K), and Poisson’s ratio (σ) were compared with theoretical model calculated using Rocherulle’s model. All the configurations of the elastic moduli obtained experimentally match very well with the configuration from Rocherulle’s model but Poisson’s ratio obtained experimentally differs from the values of Poisson’s ratio obtained through Rocherulle’s model.

scholarly journals Elastic moduli and internal friction of cold worked copper single crystals

1975 ◽  
Vol 9 (5) ◽  
pp. xxi-xxii
Author(s):  
D. Weiner ◽  
A. Van Den Beukel ◽  
P. Penning
Keyword(s):  
Internal Friction ◽  
Single Crystals ◽  
Elastic Moduli ◽  
Cold Worked ◽  
Copper Single Crystals

scholarly journals Thermal Variation of Elastic Modulus on Nanocrystalline NiCuZn Ferrites

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
S. R. Murthy
Keyword(s):  
Particle Size ◽  
Internal Friction ◽  
Curie Temperature ◽  
Temperature Variation ◽  
Room Temperature ◽  
Elastic Moduli ◽  
Anisotropy Constant ◽  
Initial Permeability ◽  
Elastic Behaviour ◽  
Thermal Variation

The nanopowders of Ni0.38Cu0.12Zn0.5Fe2O4 with particle size, 20 nm have been synthesised using Microwave-Hydrothermal method and characterized. Then the ferrite samples were microwave sintered at different temperatures in an air atmosphere and characterized. The magnetic properties were measured at room temperature. The dielectric constant (ɛ), initial permeability (μi) and quality factor (Q) has been measured on sintered samples at 1 MHz. Thermal variation of initial permeability has been measured over temperature range of 300 K–600 K. A detailed study of elastic behaviour of NiCuZn ferrites has been under taken using a composite piezoelectric oscillator method over a temperature of 300 K–600 K. The room temperature elastic moduli is found to be slightly sample dependent and decreases with increasing the temperature, except near the Curie temperature, TC, where a small anomaly is observed. The internal friction at room temperature is also found to be more particle size dependent. The temperature variation of internal friction exhibits a broad maximum around 500 K, just below Curie temperature TC 530 K. The above observations were carried on in the demagnetized state; on the application of a 400 mT magnetic field allowed us to reach the saturated state of the sample at any of the measuring temperature. The anomaly observed in the thermal variation of elastic moduli and internal friction is explained with the help of temperature variation of magneto-crystalline anisotropy constant.

Impulse excitation apparatus to measure resonant frequencies, elastic moduli, and internal friction at room and high temperature

1997 ◽  
Vol 68 (12) ◽  
pp. 4511-4515 ◽  
Author(s):  
G. Roebben ◽  
B. Bollen ◽  
A. Brebels ◽  
J. Van Humbeeck ◽  
O. Van der Biest
Keyword(s):  
High Temperature ◽  
Internal Friction ◽  
Elastic Moduli ◽  
Resonant Frequencies ◽  
Impulse Excitation

Assessing Fire Damage of Concrete by the Ultrasonic Pulse Technique

1985 ◽  
Vol 7 (2) ◽  
pp. 84 ◽  
Author(s):  
PA Wedding ◽  
H-W Chung ◽  
KS Law
Keyword(s):  
Ultrasonic Pulse ◽  
Fire Damage ◽  
Pulse Technique
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