SYMPOSIA PAPER Published: 01 January 2000

Early Stage Fatigue Damage Characterization in Aluminum Alloys and Stainless Steels with Meandering Winding Magnetometer Technology


It is shown that pre-crack and early stage fatigue damage can be characterized by a new sensor technology, the Meandering Winding Magnetometer (MWM™). This new technology consists of a conformable sensor, the MWM, and associated measurement grids that are model based.

Measurements on type 304 stainless steel indicated that damage is readily detectable at 20% of life (N/NF = 0.2) and causes a 1.5% conductivity loss. Near failure the conductivity loss in the crack-free region was approximately 4%. In 2024 aluminum the onset of detectable fatigue damage was observed at approximately 50% of total life. For the probe geometry employed, the conductivity loss in the microcrack region just prior to failure was 7%; in the macrocrack region it reached 13%.

Author Information

Weiss, V
Syracuse University
Goldfine, N
JENTEK Sensors, Inc
Natishan, M
University of Maryland
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Developed by Committee: E08
Pages: 427–438
DOI: 10.1520/STP13418S
ISBN-EB: 978-0-8031-5418-6
ISBN-13: 978-0-8031-2617-6