scholarly journals Localization and characterization of fatigue cracks around fastener holes using spherically focused ultrasonic probes

2017 ◽  
Author(s):  
Deborah Hopkins ◽  
Marvin Datuin ◽  
John Aldrin ◽  
Mark Warchol ◽  
Lyudmila Warchol ◽  
...  
Keyword(s):  
Fatigue Cracks

3D characterization of the propagation of small fatigue cracks in steels with different forging conditions

2018 ◽  
Vol 115 ◽  
pp. 2-10 ◽  
Author(s):  
Pablo Lorenzino ◽  
Jean-Yves Buffiere ◽  
Catherine Verdu
Keyword(s):  
Fatigue Cracks

Full-field Laser Shearography Instrumentation for the Detection and Characterization of Fatigue Cracks in Titanium 10-2-3

2006 ◽  
Vol 3 (4) ◽  
pp. 12757 ◽  
Author(s):  
RM Groves ◽  
D Furfari ◽  
SE Barnes ◽  
SW James ◽  
S Fu ◽  
...  
Keyword(s):  
Fatigue Cracks ◽  
Full Field ◽  
Laser Shearography

scholarly journals B-scan technique for localization and characterization of fatigue cracks around fastener holes in multi-layered structures

2018 ◽  
Author(s):  
Deborah Hopkins ◽  
Marvin Datuin ◽  
John Aldrin ◽  
Mark Warchol ◽  
Lyudmila Warchol ◽  
...  
Keyword(s):  
Fatigue Cracks ◽  
Layered Structures

Pulsed Eddy-Current Measurements of Corrosion and Cracking in Aging Aircraft

1997 ◽  
Vol 503 ◽  
Author(s):  
J. C. Moulder ◽  
J. A. Bieber
Keyword(s):  
Eddy Current ◽  
Current System ◽  
Fatigue Cracks ◽  
Single Frequency ◽  
Pulsed Eddy Current ◽  
Wide Range ◽  
Lift Off ◽  
Hidden Corrosion ◽  
Time Gating

ABSTRACTPulsed, or transient eddy-current methods are an effective tool for quantitative characterization of hidden corrosion and cracking in multi-layer aircraft structures. Eddy currents are the method of choice for this task, since they penetrate multiple layers of metal, whether or not the layers are mechanically bonded. The pulsed eddy-current technique is an important advance over conventional eddy-current methods because it rapidly acquires data over a wide range of frequencies, thereby providing more information than a conventional, single-frequency eddy-current instrument. We have combined a pulsed eddy-current instrument with a portable two-axis scanner to produce an instrument capable of rapidly scanning aircraft lap splices in situ, producing pseudo-color images that reveal hidden corrosion or cracking. A unique feature of time-domain eddy-current data is the ability to selectively filter clutter from the image by time-gating the pulsed signal. Time-gating permits the user to select the inspection depth, thereby eliminating interference from upper layers, air gaps, lift-off variation and fasteners. By using a theoretical model of the pulsed eddy-current system, it is possible to interpret the data quantitatively, yielding quantitative maps of corrosion damage. Some of the same advantages of the pulsed eddycurrent technique apply to the characterization of hidden fatigue cracks as well, although the tieory for crack signals is less advanced.

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