Abstract
Ultrasonic velocity measurements have been made to determine the dynamic elastic stiffness constants of a eutectic of unidirectional Al3Ni fibers in an α-aluminum matrix. These stiffness constants, in units of 1010 dyne/cm2, are: C33 = 132.6, C22 = C11 = 122.3, C23 = C13 = 66.5, C12 = 65.3, and C44 = 28.4, where the subscript 3 refers to the fiber direction. The experimental results indicate that the pulse-echo-overlap method can be used to determine the velocity of sound waves in a unidirectional fiber composite, and thus offers a simple and accurate method for fully describing the elastic properties of this type of material. Good agreement is found with previously reported values of Young’s modulus obtained by static tests. Engineering estimates of the elastic properties of Al3Ni are given.
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