Measurement of the cure state of a curable material using an ult

Details Measurement of the cure state of a curable material using an ult Measurement of the cure state of a curable material using an ult

1996-04-15

1998-09-08

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73597, G01N 2924, G01N 2916

Patent

active

058047255

ABSTRACT:
The cure state of a mass of a curable material, such as a composite material formed of a fiber embedded in a curable polymeric matrix, is measured. At least two wire segments are embedded into the mass, and an ultrasonic signal is propagated through the wire segments. From the ultrasonic propagation characteristics, the cure state of the mass is determined.

REFERENCES:
patent: 4559810 (1985-12-01), Hinrichs et al.
patent: 4590803 (1986-05-01), Harrold
patent: 4904080 (1990-02-01), Afromowitz
patent: 5009104 (1991-04-01), Johnson
Ronald T. Harrold et al., "Strain Measurements Inside Composite Materials Using Embedded Acoustic Waveguides," Preprint of Publication presented at Conference on Nondestructive Evaluation Applied to Process Control of Composite Fabrication, Oct. 4-5, 1994, pp. i and 1-8.
Michael J. Ehrlich et al., "Embedded Acoustic Sensors for Process Control and Health Monitoring of Composite Materials", Nondestructive Characterization of Materials IV, Plenum Press, New York, 1994, pp. 7-12.
"Material Cure and Internal Stresses Monitored Via Embedded Acoustic Waveguides" by Ronald T. Harrold and Zal N.
Sanjana, 1986 International Congress on Technology and Technology Exchange, Pittsburg, PA (Oct. 6-8 1986) pp. 30-33.

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