52971 Determination of the elastic constants of composite materials from ultrasonic group velocity measurements

1994 ◽  
Vol 27 (1) ◽  
pp. 45
Keyword(s):  
Composite Materials ◽  
Group Velocity ◽  
Elastic Constants ◽  
Velocity Measurements

Acoustic Phase Velocity Measurements along General Directions in Non-Isotropic Crystals. I. Elastic Properties of Monoclinic K3Co(CN)6

1971 ◽  
Vol 49 (12) ◽  
pp. 1597-1605 ◽  
Author(s):  
T. H. Chou ◽  
S. L. McBride ◽  
N. Rumin
Keyword(s):  
Elastic Constants ◽  
Experimental Error ◽  
Acoustic Velocity ◽  
Acoustic Energy ◽  
Perturbation Calculation ◽  
Velocity Measurements ◽  
Phase Velocities ◽  
Low Symmetry ◽  
Acoustic Phase

The complete elastic constants tensor of monoclinic potassium cobalticyanide [K3Co(CN)6] has been determined from measured ultrasonic phase velocities. These were obtained as a function of direction in several crystal planes by measuring the acoustic energy reflection coefficient at a liquid–solid interface as a function of angle and plane of incidence. The measurements were made at 27.6 MHz in p-xylene at 21.5 °C. The elastic constants were determined using an existing perturbation method. Velocities calculated from the derived elastic constants are in agreement with the measured velocities to within experimental error and the approximations in the perturbation calculation. The usefulness of this method for the determination of the elastic constants of low symmetry crystals is thus established. The Debye temperature of K3Co(CN)6 is estimated from the results to be 290 ± 10 °K with a corresponding mean acoustic velocity of 2560 ± 80 m/s.

scholarly journals Determination of Elastic Constants of Composites with a Circular Disk Specimen

2001 ◽  
Vol 10 (3) ◽  
pp. 096369350101000 ◽  
Author(s):  
R. Prabhakaran ◽  
H. Xu
Keyword(s):  
Composite Materials ◽  
Elastic Constants ◽  
Composite Structures ◽  
Simple Procedure ◽  
Circular Disk ◽  
Analysis And Design ◽  
Disk Specimen ◽  
Calibration Specimen ◽  
Single Calibration

The in-plane elastic constants of orthotropic composite materials need to be determined in order to perform stress analysis and design of composite structures. Several specimen configurations have been proposed and the majority suffer from one of two drawbacks: either multiple specimens are required or the experimental method involves a scientific rather than an engineering approach. In the present investigation a simple procedure involving a single calibration specimen is suggested. The method utilises a theoretical solution available in the literature for an orthotropic circular disk under diametral compression, measured strains at specific locations on a circular disk specimen, and a least squares procedure that gives average rather than localised elastic constants.

scholarly journals Determination of the elastic constants of anisotropic composite materials via laser photoacoustics

1989 ◽  
Vol 85 (S1) ◽  
pp. S150-S150
Author(s):  
Bernard Castagnede ◽  
Wolfgang Sachse ◽  
Michael O. Thompson
Keyword(s):  
Composite Materials ◽  
Elastic Constants ◽  
Anisotropic Composite
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