Continuous monitoring of fatigue-crack growth by acoustic-emission techniques

Harris, D.O.; Dunegan, H.L.

doi:10.1007/bf02323130

Cited by 109 publications

(49 citation statements)

References 13 publications

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“…Figure 5 shows the comparison between the mechanical parameter D and the acoustic parameter ''accumulated counts'' versus the relative number of cycles to fracture. [2,[9][10][11] Counts are threshold crossings of an acoustic hit. [6,7,12] First damage is acoustically registered from about 80% of lifetime.…”

Section: Investigations Of the Background Noisementioning

confidence: 99%

In Situ Damage Detection With Acoustic Emission Analysis During Cyclic Loading of Wire Reinforced EN AW‐6082

2010

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In the field of lightweight construction, hybrid structures such as reinforced metal matrix composites are highly qualified materials. The direct composite extrusion process allows for continuous manufacturing of wire reinforced aluminum matrix profiles. The aim is to increase the stiffness and specific strength in a way that the composite material shows better mechanical properties than the single matrix material. To determine and locate damage evolution during cyclic loading of spring steel reinforced EN AW‐6082 matrix the acoustic emission analysis is used. Furthermore it allows for getting more information about the damage mechanisms during fatigue of the matrix and the final failure of the reinforcing element. The current work also includes the determination of damage evolution using strain measuring methods.

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Section: Investigations Of the Background Noisementioning

confidence: 99%

In Situ Damage Detection With Acoustic Emission Analysis During Cyclic Loading of Wire Reinforced EN AW‐6082

2010

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“…Much higher rates of one to two complex cycles/sec were used in growing the cracks on the MTS machine. The differences in the loading rates were not expected to affect the behavior of the fatigue cracks nor the acoustic emissions produced [5,6].…”

Section: Laboratory Fatigue Testsmentioning

confidence: 99%

Analysis of Acoustic Emissions from a Steel Bridge Hanger

et al. 1998

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A steel bridge hanger with three fatigue cracks was monitored for acoustic emission (AE) using combined source location, strain gauge monitoring, and waveform analysis. AE activities from all three cracks were clearly identified and classified as crack growth or noise signals using location, strain magnitude, position on strain cycle, and uniqueness of waveforms as the primary criteria. A vast majority of AE from the cracks was found to be due to crack face rubbing and the crushing of corrosion products between the crack faces while limited crack growth emissions were detected. Results from laboratory tests on A588 compact tension specimens under variable-amplitude tension-tension fatigue loading were used to aid in interpreting AE data from the hanger. Crack growth AEs from these tests were detected only on overload cycles mostly above 92% of the maximum load while AE due to crack face rubbing occurred throughout the load cycle.

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“…The detection, however, is greatly facilitated with the use of acoustic emission (AE) technique as it permits continuous damage inspection, classification and identification of modes of failure in various constituents of the composite in real time [2,3]. However, in spite of extensive use of AE technique in engineering applications [2][3][4][5][6]; literature on its application in fatigue crack growth (FCG) and especially in sandwich composites is scarce [1].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Performance of Sandwich Composites

Shafiq¹

2007

Earthquakes and Acoustic Emission

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This paper delineates the results of fatigue testing performed to characterize, i. tensile fatigue lifetime and ii. flexure fatigue lifetime as a function of the thickness of foam core. Sandwich composites were made of single ply carbon fiber facesheets with urehane foam core. Acoustic emission analysis indicated core damage to be the predominant failure activity while fiber rupture served as a precursor to catastrophic failure. Near crack tip region was observed to have multiple crack initiation sites before the onset of crack growth. Crack path was found to erratic on the facesheets while the crack in the foam primarily followed a planar growth along the interface with the facesheets. Both mode I and II cracking was observed in the core and along the interface between the core and the facesheets. Flexural fatigue life was found to be unlimited below 75% of the ultimate static load. Foam core size effect is found to be significant in the crack growth and lifetime behavior. An AE based stiffness reduction model was developed to quantify the extent of damage and stochastic analysis was performed to account for large scatter in the lifetime data.

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Continuous monitoring of fatigue-crack growth by acoustic-emission techniques

Cited by 109 publications

References 13 publications

In Situ Damage Detection With Acoustic Emission Analysis During Cyclic Loading of Wire Reinforced EN AW‐6082

In Situ Damage Detection With Acoustic Emission Analysis During Cyclic Loading of Wire Reinforced EN AW‐6082

Analysis of Acoustic Emissions from a Steel Bridge Hanger

Fatigue Performance of Sandwich Composites

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