Location

Williamsburg, VA

Start Date

1-1-1988 12:00 AM

Description

The object of the work is a combined theroretical and experimental study of diffraction of Lamb waves by two- and three-dimensional cracks in a plate. An important motivation for this project is the desire to develop a technique capable of detecting and characterizing cracks in weldments in plates. We want to analyze the dependence of the scattered signals on the dimension, angle of inclination and depth of burial of the crack. The basic measurement techniques requires the accurate determination of minute normal surface displacements at ultrasonic frequencies. Such measurements have recently been made possible by the development in our laboratory of a new surface displacement capacitive tranducer [1]. The measured displacements will be compared with the theoretical predictions.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

7B

Chapter

Chapter 7: Characterization of Materials

Section

Cracks and Deformations

Pages

1521-1523

DOI

10.1007/978-1-4613-0979-6_77

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Characterization of Cracks in Thick Plates by Lamb Wave Diffraction Studies

Williamsburg, VA

The object of the work is a combined theroretical and experimental study of diffraction of Lamb waves by two- and three-dimensional cracks in a plate. An important motivation for this project is the desire to develop a technique capable of detecting and characterizing cracks in weldments in plates. We want to analyze the dependence of the scattered signals on the dimension, angle of inclination and depth of burial of the crack. The basic measurement techniques requires the accurate determination of minute normal surface displacements at ultrasonic frequencies. Such measurements have recently been made possible by the development in our laboratory of a new surface displacement capacitive tranducer [1]. The measured displacements will be compared with the theoretical predictions.