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Characterization of miniaturized tensile specimens using micromagnetic techniques

: Rösner, H.; Meyendorf, N.

Meyendorf, N.; Baaklini, G.Y.; Michel, B. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Nondestructive evaluation and reliability of micro- and nanomaterial systems : 18 - 19 March 2002, San Diego, USA
Bellingham/Wash.: SPIE, 2002 (SPIE Proceedings Series 4703)
ISBN: 0-8194-4451-0
Conference "Nondestructive Evaluation and Reliability of Micro- and Nanomaterial Systems" <2002, Newport Beach/Calif.>
Conference Paper
Fraunhofer IZFP ()
Barkhausen noise; mini tensile specimen; size effect; machining; cross correlation; surface characterization; depth profiling; eddy current; microcracks

Miniaturized dogbone tensile specimens are used to determine mechanical properties when only a small amount of material is available. Because of the high surface to volume ratio, surface finishing becomes critical for specimens with diameters less than 2 mm. Barkhausen noise technique was used to characterize the machined surfaces of small diameter tensile specimens. Full surface scans were conducted using a new magnetization technique. The Barkhausen noise profile curves for several different analyzing frequencies were compared to those obtained on electro-polished specimens using correlation techniques in order to characterize the penetration depth of the surface treatment.