Location
La Jolla, CA
Start Date
1-1-1983 12:00 AM
Description
It is well known that partial contact of two rough crack surfaces will lead to transmission of an acoustic signal across the crack, thus giving rise to a reduced probability of detection (POD). To explore the effects and consequences of such partial contact, impression experiments—using small spheres—have been performed to determine the effects of contact area on the amplitude transmitted. The results have been compared with a theory described elsewhere in these Proceedings. Based on the experimental results it will be speculated that the residual stress field responsible for the crack closure may be calculated based on a determination of the size and separation of the contact areas.
Book Title
Review of Progress in Quantitative Nondestructive Evaluation
Volume
2A
Chapter
Section 6: Closure Effects in Fatigue Cracks
Pages
345-352
DOI
10.1007/978-1-4613-3706-5_20
Copyright Owner
Springer-Verlag US
Copyright Date
January 1983
Language
en
File Format
application/pdf
Simulation of Closure: Effects on Crack Detection Probability and Stress Distributions
La Jolla, CA
It is well known that partial contact of two rough crack surfaces will lead to transmission of an acoustic signal across the crack, thus giving rise to a reduced probability of detection (POD). To explore the effects and consequences of such partial contact, impression experiments—using small spheres—have been performed to determine the effects of contact area on the amplitude transmitted. The results have been compared with a theory described elsewhere in these Proceedings. Based on the experimental results it will be speculated that the residual stress field responsible for the crack closure may be calculated based on a determination of the size and separation of the contact areas.
