Evaluation of fatigue damage in steel structural components by magnetoelastic Barkhausen signal analysis

Journal Article · Sat May 15 04:00:00 EDT 1993 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.352737· OSTI ID:6893657

Govindaraju, M R; Strom, A; Jiles, D C; Biner, S B; Chen, Z ^[1]

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1. Ames Laboratory and Center for NDE, Iowa State University, Ames, Iowa 50011 (United States)

This paper is concerned with using a magnetic technique for the evaluation of fatigue damage in steel structural components. It is shown that Barkhausen effect measurements can be used to indicate impending failure due to fatigue under certain conditions. The Barkhausen signal amplitude is known to be highly sensitive to changes in density and distribution of dislocations in materials. The sensitivity of Barkhausen signal amplitude to fatigue damage has been studied in the low-cycle fatigue regime using smooth tensile specimens of a medium strength steel. The Barkhausen measurements were taken at depths of penetration of 0.02, 0.07, and 0.2 mm. It was found that changes in magnetic properties are sensitive to microstructural changes taking place at the surface of the material throughout the fatigue life. The changes in the Barkhausen signals have been attributed to distribution of dislocations in stage I and stage II of fatigue life and the formation of a macrocrack in the final stage of fatigue.

• OSTI ID: 6893657
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 73:10; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
42 ENGINEERING
420500 -- Engineering-- Materials Testing
ALLOYS
CRACKS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
FATIGUE
IRON ALLOYS
IRON BASE ALLOYS
LINE DEFECTS
MAGNETIC TESTING
MATERIALS TESTING
MECHANICAL PROPERTIES
NONDESTRUCTIVE TESTING
SIGNALS
STEELS
STRUCTURAL BEAMS
TESTING