Location

Williamsburg, VA

Start Date

1-1-1988 12:00 AM

Description

Previous work has shown that ultrasonic backscatter is sensitive to the presence of porosity in fiber-reinforced laminates. In the case of oblique incidence, the dependence of backscatter on azimuthal angle will change with the introduction of randomly distributed porosity [1–6], and the observed change in azimuthal dependence appears to depend on the morphology of the introduced porosity [4]. Additionally, it was shown that temporal frequency spectra of backscatter from composite laminates display characteristics arising from the laminate structure which can be observed through appropriate signal processing, and that these spectral characteristics are altered by the introduction of porosity [4]

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

7B

Chapter

Chapter 5: Adhesive Bonds and Composites

Section

Composites—Defects

Pages

1053-1062

DOI

10.1007/978-1-4613-0979-6_21

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Characterization of Porosity in Continuous Fiber-Reinforced Composites with Ultrasonic Backscatter

Williamsburg, VA

Previous work has shown that ultrasonic backscatter is sensitive to the presence of porosity in fiber-reinforced laminates. In the case of oblique incidence, the dependence of backscatter on azimuthal angle will change with the introduction of randomly distributed porosity [1–6], and the observed change in azimuthal dependence appears to depend on the morphology of the introduced porosity [4]. Additionally, it was shown that temporal frequency spectra of backscatter from composite laminates display characteristics arising from the laminate structure which can be observed through appropriate signal processing, and that these spectral characteristics are altered by the introduction of porosity [4]