Nonlinear Ultrasonic to Assess Localized Plastic Deformation During High Cycle Fatigue

Sagar, S Palit; Metya, Avijit Kumar; Parida, N; Ghosh, Ranajoy

doi:10.1063/1.2902578

Cited by 2 publications

(1 citation statement)

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“…Combined, this behavior corresponds well with the theory that the reordering of dislocations into low energy dislocation structures causes a drop in acoustic nonlinearity. This effect has been suggested [18] in response to the formation of persistent slip bands, here it is observed for the initiation of cell walls. Future studies are needed to understand the magnitude and sensitivity of β to low energy dislocation structures.…”

Section: B Nonlinearity Of Tensile Samplesmentioning

confidence: 83%

Material microstructure and ultrasonic nonlinearity

Zinck

Krishnaswamy

2013

2013 IEEE International Ultrasonics Symposium (IUS)

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Ultrasonic nonlinearity measurements have been suggested as an effective tool for the early detection of fatigue damage in metallic structures. However, the correlation between ultrasonic nonlinearity and material damage induced by fatigue or plastic deformation has been observed to be non-monotonic by several researchers including by our group. To clarify the correlation between microstructure and ultrasonic nonlinearity, the nonlinear ultrasonic behavior of polycrystalline copper is observed at multiple stages of monotonic loading; while under tension, at the loaded peak, while unloading, and after loading. The microstructures corresponding to changes in nonlinearity are examined using hardness testing and transmission electron microscopy. In this system, ultrasonic nonlinearity does not monotonically increase with increased strain and dislocation density. Models that explain drops in nonlinearity are suggested, and destructive testing is used to support findings.

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Section: B Nonlinearity Of Tensile Samplesmentioning

confidence: 83%

Material microstructure and ultrasonic nonlinearity

Zinck

Krishnaswamy

2013

2013 IEEE International Ultrasonics Symposium (IUS)

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Acoustic Nonlinearity of Surface Wave in a Fatigued Aluminum Alloy Specimen

Jhang

Lee

2012

Mater. Trans.

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This paper reports a case study for the evaluation of surface fatigue damage by using the acoustic nonlinearity of surface waves. A measurement system using contact angle beam transducers was constructed to measure the acoustic nonlinearity of surface waves based on the harmonic measurement. In order to prove the general properties of acoustic nonlinearity, dependencies of the second harmonic amplitude on the fundamental frequency amplitude and the propagation distance were tested first, where the effect of frequency-dependent attenuation was compensated for. The results showed good agreement with the theoretical expectations. Next, an aluminum 6061 T6 specimen, of which the surface was damaged by a three-point bending fatigue test, was experimented on and magnitudes of nonlinear parameter, measured before and after the fatigue test, were compared. We could see a clear increase in the nonlinear parameter after the fatigue test at the central position of the specimen, where the surface fatigue damage was expected to be concentrated.

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Nonlinear Ultrasonic to Assess Localized Plastic Deformation During High Cycle Fatigue

Cited by 2 publications

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Material microstructure and ultrasonic nonlinearity

Material microstructure and ultrasonic nonlinearity

Acoustic Nonlinearity of Surface Wave in a Fatigued Aluminum Alloy Specimen

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