Location

Williamsburg, VA

Start Date

1-1-1988 12:00 AM

Description

Contact between the surfaces of a fatigue crack is developed by a variety of mechanisms [1,2], including plastic deformation, sliding of the two faces with respect to one another or the collection of debris such as oxide particles [3]. Consequently, certain characteristic effects occur when the crack is illuminated by an elastic wave. When no contacts are present, a singularity exists in the elastodynamic fields at the crack tip, leading to a set of diffracted fields emanating from the tip. The presence of the contacts modifies the tip diffracted fields and allows energy to be directly transmitted through the crack, requiring modifications in the non-destructive evaluation techniques to detect or size the crack.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

7B

Chapter

Chapter 7: Characterization of Materials

Section

Bonds and Interfaces

Pages

1301-1310

DOI

10.1007/978-1-4613-0979-6_50

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Effects of Imperfect Interfaces on Acoustic Transmission and Diffraction

Williamsburg, VA

Contact between the surfaces of a fatigue crack is developed by a variety of mechanisms [1,2], including plastic deformation, sliding of the two faces with respect to one another or the collection of debris such as oxide particles [3]. Consequently, certain characteristic effects occur when the crack is illuminated by an elastic wave. When no contacts are present, a singularity exists in the elastodynamic fields at the crack tip, leading to a set of diffracted fields emanating from the tip. The presence of the contacts modifies the tip diffracted fields and allows energy to be directly transmitted through the crack, requiring modifications in the non-destructive evaluation techniques to detect or size the crack.