Location

Williamsburg, VA

Start Date

1-1-1988 12:00 AM

Description

The ultrasonic attenuation and velocity in graphite/epoxy (Gr/Ep) composites damaged by real and simulated laser radiation were measured. The measurements were carried out with composite ultrasonic test equipment (CUTE), a water-tank testbed constructed to study the elastic properties of samples subjected to CO2 laser radiation at several different scan rates. Parallel simulation studies were carried out on samples subjected to temperatures high enough to cause pyrolysis. The ultrasonic measurements were made in the 1 to 5 MHz frequency range for varying angles of incidence. The damage manifests itself in differing degrees of porosity depending on the intensity of irradiation. Both attenuation and velocity were found to be sensitive to this damage.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

7B

Chapter

Chapter 5: Adhesive Bonds and Composites

Section

Composites—Defects

Pages

1069-1074

DOI

10.1007/978-1-4613-0979-6_23

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Ultrasonic NDE of Laser-Damaged Organo-Matrix Composites

Williamsburg, VA

The ultrasonic attenuation and velocity in graphite/epoxy (Gr/Ep) composites damaged by real and simulated laser radiation were measured. The measurements were carried out with composite ultrasonic test equipment (CUTE), a water-tank testbed constructed to study the elastic properties of samples subjected to CO2 laser radiation at several different scan rates. Parallel simulation studies were carried out on samples subjected to temperatures high enough to cause pyrolysis. The ultrasonic measurements were made in the 1 to 5 MHz frequency range for varying angles of incidence. The damage manifests itself in differing degrees of porosity depending on the intensity of irradiation. Both attenuation and velocity were found to be sensitive to this damage.