EFFECTS OF DYNAMIC AND STATIC LOADING ON EDDY CURRENT NDE OF FATIGUE CRACKS | Zendy

C. C. H. Lo | Zendy; N. Nakagawa | Zendy; Donald O. Thompson | Zendy; Dale E. Chimenti | Zendy

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EFFECTS OF DYNAMIC AND STATIC LOADING ON EDDY CURRENT NDE OF FATIGUE CRACKS

Author(s) -

C. C. H. Lo,

N. Nakagawa,

Donald O. Thompson,

Dale E. Chimenti

Publication year - 2009

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.177

H-Index - 75

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.3114232

Subject(s) - materials science , crack closure , composite material , amplitude , perpendicular , tension (geology) , structural engineering , dynamic loading , eddy current , signal (programming language) , lift (data mining) , compression (physics) , fracture mechanics , engineering , electrical engineering , computer science , optics , mathematics , geometry , physics , programming language , data mining

This paper reports on a study of the effects of dynamic and static loading on eddy current (EC) crack signals in aerospace materials. In situ EC measurements were performed on a series of fatigue crack samples grown in Al 6061 bars under dynamic loading. The EC signals detected at a fixed location on the fatigue cracks were found to vary periodically with cyclic loading. Under dynamic tension, the amplitude of the vertical component of the crack signal, which is perpendicular to the lift off direction, increases with the load amplitude and the effect is stronger for longer cracks. Such changes in EC signals are attributable to crack morphology changes (i.e. crack opening) under tension. In contrast, the amplitude of crack signal remains relatively unchanged under compression, possibly due to the insulation effect of the oxidation layer on the crack face. The loading effects on crack signals in the Al samples were confirmed by obtaining c‐scan images of the fatigue cracks under static loads. C‐scans conduc...

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