Location

La Jolla, CA

Start Date

1981 12:00 AM

Description

We have extended our earlier investigation of scattering from surface cracks. In particular, we have studied the change in the reflection coefficient of a Rayleigh wave incident on a half-penny shaped surface crack along with the corresponding change in the acoustic crack size estimates as the cracked sample is stressed to fracture. We have examined in this manner both cracks in annealed samples and as-indented cracks. We have found that the fracture behavior for cracks in these two types of samples differ quite significantly, with the cracks in the annealed samples exhibiting a partial crack closure characteristic and the cracks in the as-indented samples displaying both crack closure and crack growth effects.

Book Title

Proceedings of the ARPA/AFML Review of Progress in Quantitative NDE

Chapter

6. Ceramic NDE

Pages

144-150

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Surface Acoustic Wave Measurements of Surface Cracks in Ceramics

La Jolla, CA

We have extended our earlier investigation of scattering from surface cracks. In particular, we have studied the change in the reflection coefficient of a Rayleigh wave incident on a half-penny shaped surface crack along with the corresponding change in the acoustic crack size estimates as the cracked sample is stressed to fracture. We have examined in this manner both cracks in annealed samples and as-indented cracks. We have found that the fracture behavior for cracks in these two types of samples differ quite significantly, with the cracks in the annealed samples exhibiting a partial crack closure characteristic and the cracks in the as-indented samples displaying both crack closure and crack growth effects.