Systems for monitoring changes in elastic stiffness in composite

Details Systems for monitoring changes in elastic stiffness in composite Systems for monitoring changes in elastic stiffness in composite

1982-07-22

1985-02-19

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73570, 73577, G01N 2900

Patent

active

044997701

ABSTRACT:
Traversing energy flux transmitted into a fiber/matrix composite structure is propagated through the structure in directions which vary depending upon the elastic stiffness condition of the composite. Degradation in elastic stiffness of the composite, from any cause, will result in variations in the direction of travel of the flux through the composite. By determining the direction of flux propagation in the composite, or the portion of the composite structure from which the flux is detected as it exits the structure, the condition of the composite structure, independent of the source of degradation, can be determined. In preferred embodiments the energy flux is ultra-sound energy, while in preferred testing devices a single transmitting transducer is directed towards at least two receiving transducers, for example, one located at a position to receive some flux in the total absence of stiffness degradation, and a second located at a position to receive some flux which would have traveled through a stiffness degraded structure.

REFERENCES:
"Ultrasonic Attenuation as an Indicator of Fatigue Life of Graphite Fiber oxy Composites", Williams, Jr. et al., Materials Evaluation, May 1980, pp. 33-37.

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