Automatic monitoring of composite prepregs

Measuring and testing – Vibration – By mechanical waves

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73635, G01N 2900

Patent

active

051814218

ABSTRACT:
A method and apparatus for non-destructively determining fiber volume fraction and resin porosity of a composite material or prepreg wherein the composite material or prepreg is moved between a roller and a roller-transducer housing. A transducer assembly is supported in the roller-transducer housing for propagating two independent acoustic waves through the composite material. A water medium is disposed in the roller-transducer housing. The two acoustic waves are propagated through the water medium, through the thickness of the roller-transducer housing and through the composite material or prepreg. The velocity of each of two acoustic waves, V.sub.1 and V.sub.2, are determined and the thickness of the composite material or prepreg is determined. The fiber volume fraction in resin porosity of the composite material or prepreg are then determined using the velocities V.sub.1 and V.sub.2, the thickness and known parameters of density, elastic modulii of the constituent material and layup sequence.

REFERENCES:
patent: 3720098 (1973-03-01), Dixon
patent: 3995501 (1976-12-01), Wiley
patent: 4735087 (1988-04-01), Hourani et al.
patent: 4745809 (1988-05-01), Collins et al.
patent: 5024091 (1991-06-01), Pellerin et al.
patent: 5031457 (1991-07-01), Kline
patent: 5074149 (1991-12-01), Stearns
The Analysis of Fibre-Reinforced Porous Composite Materials by the Measurement of Ultrasonic Wave Velocities--Ultrasonics, Jul. 1978, 5 pages, .COPYRGT.1978 IPC Business Press Ltd.

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