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.

A Study of the Fiber-Matrix Interface in Composite Materials

1992 ◽  
Vol 59 (2S) ◽  
pp. S163-S165 ◽  
Author(s):  
Jin O. Kim ◽  
Haim H. Bau
Keyword(s):  
Composite Materials ◽  
Experimental Technique ◽  
Stress Waves ◽  
Matrix Interface ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
The Matrix ◽  
Fiber Matrix Interface ◽  
Dispersion And Attenuation

A novel experimental technique for studying the characteristics of the interface between the fibers and the matrix in both undamaged and damaged fiber-reinforced composite materials is described. The experimental technique involves the transmission of stress waves in one or more fibers of the composite. The characteristics of the stress waves, such as speed, dispersion, and attenuation, are measured. These measured variables can be correlated with the characteristics of the bonding between the fiber and the matrix.

Mechanical loss in a glass-epoxy composite

1990 ◽  
Vol 5 (5) ◽  
pp. 913-915 ◽  
Author(s):  
Manfred Weller ◽  
Hassel Ledbetter
Keyword(s):  
Epoxy Resin ◽  
Epoxy Composite ◽  
Glass Fibers ◽  
Resin Matrix ◽  
Torsion Pendulum ◽  
Loss Peak ◽  
Mechanical Loss ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Computer Controlled

Using a computer-controlled inverted torsion pendulum at frequencies near 1 Hz, we determined the mechanical losses in a uniaxially fiber-reinforced composite. The composite comprised glass fibers in an epoxy-resin matrix. We studied three fiber contents: 0,41, and 49 vol.%. Three mechanical-loss peaks appeared: above 300 K, near 200 K, and near 130 K. They correspond closely to α, β, and γ peaks found previously in many polymers. We failed to see a mechanical-loss peak for either the glass or the glass-resin interface. Between 300 and 4 K, the torsion modulus increased in the resin by a factor of 3.30 and in the 0.49 glass-epoxy by a factor of 2.37.

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

Propagation of Stress Waves in Fiber-Reinforced Composite Rods

AIAA Journal ◽  
1971 ◽  
Vol 9 (8) ◽  
pp. 1492-1498 ◽  
Author(s):  
T. R. TAUCHERT ◽  
F. C. MOON
Keyword(s):  
Stress Waves ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite
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