Ultrasonic nondestructive evaluation of cracked composite laminates

A. K. Mal*, Ching-Chung Yin, Y. Bar-Cohen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


Guided wave behavior in undamaged as well as damaged fiber-reinforced composite laminates is studied in an effort to develop ultrasonic nondestructive methods for their quantitative characterization. A global matrix method is used to formulate the wave propagation problem and to calculate the reflection coefficients and dispersion curves for unidirectional and angle-ply laminates immersed in water. The depth of an interface delamination in a unidirectional plate is determined through the analysis of the reflected waves. A systematic inversion scheme of dispersion data is applied to determine the reduction in stiffness due to transverse cracks in the off-axis plies of damaged, multi-orientation laminates. Excellent agreement between the theoretical results and measured data is achieved in most cases, indicating that the model is accurate within the framework of linear theory.

Original languageEnglish
Pages (from-to)85-101
Number of pages17
JournalComposites Engineering
Issue number2
StatePublished - 1 Jan 1991


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