Location

La Jolla, CA

Start Date

1-1-1989 12:00 AM

Description

The leaky Lamb wave (LLW) phenomenon in composite laminates has been studied using pulses rather than tone burst or continuous waveforms. For unidirectional laminates, the leaky wave pulses propagating obliquely to the fibers are shown to be strongly influenced by the presence of flaws within the laminate. The differences in the pulse characteristics have been employed to detect and image ply-gaps, delaminations, and variations in the resin/fiber ratio in laboratory specimens. Moreover, the depth distribution of porosity, simulated by microballoons, has been clearly shown with a C-scan system. Theoretical simulations of pulse propagation have been conducted for multilayered, multiorientation laminates, and the calculated reflected pulses are in close agreement with those obtained from the LLW experiments for a variety of specimens.

Volume

8B

Chapter

Chapter 8: Composites

Section

Composites—Defects

Pages

1671-1677

DOI

10.1007/978-1-4613-0817-1_211

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Leaky Lamb Wave Phenomena in Composites Using Pulses

La Jolla, CA

The leaky Lamb wave (LLW) phenomenon in composite laminates has been studied using pulses rather than tone burst or continuous waveforms. For unidirectional laminates, the leaky wave pulses propagating obliquely to the fibers are shown to be strongly influenced by the presence of flaws within the laminate. The differences in the pulse characteristics have been employed to detect and image ply-gaps, delaminations, and variations in the resin/fiber ratio in laboratory specimens. Moreover, the depth distribution of porosity, simulated by microballoons, has been clearly shown with a C-scan system. Theoretical simulations of pulse propagation have been conducted for multilayered, multiorientation laminates, and the calculated reflected pulses are in close agreement with those obtained from the LLW experiments for a variety of specimens.