System for nondestructively determining composite material param

Details System for nondestructively determining composite material param System for nondestructively determining composite material param

1989-06-21

1991-07-16

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73588, 73598, G01N 2900

Patent

active

050314572

ABSTRACT:
A method and apparatus for nondestructively determining fiber volume fraction and resin porosity of a composite material constructed of at least two different constituent materials wherein the following parameters of the composite material to be tested are known: density, elastic moduli of the constituent materials and layup sequence. Two acoustic waves of different polarizations are propagated through the composite material and the acoustic waves propagated through the composite material are sensed and the velocity of each of the two acoustic waves, V.sub.1 and V.sub.2, are determined. The thickness of the composite material is determined. The fiber volume fraction and resin porosity of the composite material are then determined using the velocities, V.sub.1 and V.sub.2, the thickness and known parameters of density, elastic moduli of the constituent materials and layup sequence.

REFERENCES:
patent: 3720098 (1973-03-01), Dixon
patent: 3995501 (1976-12-01), Wiley
patent: 4745809 (1988-05-01), Collins et al.
Li et al., "Principles of an Acoustic Impedance Method of Detection and Location of Non-bonds in Adhesive-bonded Multi-layered Joints" NDT International Jun. 1982.
The Analysis of Fibre-Reinforced Porous Composite Materials by the Measurement of Ultrasonic Wave Velocities-Ultrasoncis, Jul. 1978, 5 pages, .COPYRGT.1978 IPC Business Press Ltd.

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