Properties of composite laminates using leaky lamb waves

Details Properties of composite laminates using leaky lamb waves Properties of composite laminates using leaky lamb waves

1986-05-13

1987-06-23

Ciarlante, Anthony V.

Measuring and testing

Vibration

By mechanical waves

73628, 73644, G01N 2904

Patent

active

046743340

ABSTRACT:
Method and system for detecting defects in the structure of a composite laminate material are described which comprise a first transducer for directing an ultrasonic beam of preselected frequency along a transmission axis onto a surface of the laminate at a preselected angle to generate Lamb waves in the laminate and leaky Lamb waves reflected therefrom; a second transducer for detecting the reflected leaky Lamb waves and for providing an output signal corresponding to the amplitude of the reflected waves; a fluid sonically coupling the laminate with the transducers; a positioning system for selectively positioning the transducers along the surface of the laminate to produce a set of output signals characterizing the laminate; and suitable electronics for receiving and processing the output signals and comparing them with signals characteristic of a defect free sample of the laminate.

REFERENCES:
patent: 3165922 (1965-01-01), Worlton
patent: 3250120 (1966-05-01), Dickinson, III
patent: 3512400 (1970-05-01), Lynnworth
patent: 4182155 (1980-01-01), Fowler
patent: 4457174 (1984-07-01), Bar-Cohen et al.
patent: 4494408 (1985-01-01), DeLacy
patent: 4523468 (1985-06-01), Derkacs et al.
patent: 4538462 (1985-09-01), Hartog et al.
patent: 4558598 (1985-12-01), Young

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