Location

Brunswick, ME

Start Date

1-1-1992 12:00 AM

Description

The use of unidirectional boron-epoxy composites to reinforce highly stressed or damaged regions in defence aircraft structures is increasing rapidly [1]. Critical nondestructive evaluation problems related to such repair technology include the need to ensure the integrity of the bond between the composite reinforcement and the substrate, and to detect and measure the depth of a crack underneath the reinforcement. Among possible ultrasonic techniques, leaky interface waves have shown promise for the measurement of adhesive bond strength [2], and could also allow extension to second-layer cracks of crack depth measurement techniques such as Rayleigh wave spectral modulation [3,4]. However, it is first necessary to measure elastic constants, C;1, for the composite, as these constants are needed to determine whether leaky interface waves occur for a particular composite/substrate combination.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

11A

Chapter

Chapter 2: Evolving Techniques

Section

Laser Ultrasonics

Pages

585-592

DOI

10.1007/978-1-4615-3344-3_75

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Elastic Constants for Unidirectional Boron-Epoxy Composites

Brunswick, ME

The use of unidirectional boron-epoxy composites to reinforce highly stressed or damaged regions in defence aircraft structures is increasing rapidly [1]. Critical nondestructive evaluation problems related to such repair technology include the need to ensure the integrity of the bond between the composite reinforcement and the substrate, and to detect and measure the depth of a crack underneath the reinforcement. Among possible ultrasonic techniques, leaky interface waves have shown promise for the measurement of adhesive bond strength [2], and could also allow extension to second-layer cracks of crack depth measurement techniques such as Rayleigh wave spectral modulation [3,4]. However, it is first necessary to measure elastic constants, C;1, for the composite, as these constants are needed to determine whether leaky interface waves occur for a particular composite/substrate combination.