Abstract
The stiffness matrix of Al2O3/ Al2O3 composites has been non-destructively evaluated using ultrasonics. The method is based on the propagation velocities of sound waves in the material. These were estimated experimentally using a custom pulser-receiver setup which allows control of the angle of the incident pulse on the sample, while the latter is immersed in a water bath. The recording of the time delay of the longitudinal and transverse wave components as they travel through the composite allows the determination of their respective propagation velocities within the composite, as a function of the incident angle for a given recording plane..The derivation of the elastic constants in order to reproduce the stiffness matrix of the composite is an inverse wave propagation problem described by the Christoffel equation. All 9 elastic constants are derived assuming an orthotropic medium. The derived elastic constants are compared to experimental data acquired destructively.
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Paipetis, A., Kostopoulos, V. (2003). Ultrasonic Stiffness Matrix Measurements of Oxide/Oxide Composites. In: Gdoutos, E.E., Marioli-Riga, Z.P. (eds) Recent Advances in Composite Materials. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2852-2_14
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DOI: https://doi.org/10.1007/978-94-017-2852-2_14
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-6294-9
Online ISBN: 978-94-017-2852-2
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