Measurement of complex Young moduli of composite materials by time-gated microwaves

Hosten, Bernard; Bacon, Christophe
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1113
Academic Journal
The complex Young’s modulus of composite materials made of glass/fibers and epoxy matrix is deduced from the measurement of velocities and amplitude of acoustic waves generated by microwaves. A magnetron working at 10 GHz delivers a pulse of 1.2 μs with a power of 5 kilowatts. Acoustic rod modes are generated at both interfaces of the sample that is placed in a waveguide. The acoustic wave generation is due to the rapid thermal expansion caused by microwave absorption. From a unidirectional model the acceleration at any position in the sample can be computed. An accelerometer acquired the acoustic waveform in a low frequency domain (5–25 kHz) at an end of the rod. The comparison between experimental and theoretical accelerations permits to solve the inverse problem of determination of the viscoelastic properties of the rod. The samples are cut out of a plate in various directions to measure the viscoelastic properties along the fibers or in the perpendicular direction. A comparison between complex Young’s moduli measured at low and ultrasonic frequencies will be presented and leads to some comments about the attenuation along the fibers in composite materials. © 2000 American Institute of Physics.


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