Locating point of impact in anisotropic fiber reinforced composite plates

Kundu, Tribikram; Das, Samik; Martin, Steven; Jata, Kumar V.

doi:10.1016/j.ultras.2007.12.001

Cited by 184 publications

(137 citation statements)

References 17 publications

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“…It has been observed that for impact point loading the optimization method is better than triangulation technique for predicting AE sources. Kundu et al (2008) modified the definition of the objective function they predicted earlier to overcome the problem of multiple singularities. Expression of the objective function for multiple sensors is also redefined to maximize the efficiency of detecting the impact point.…”

Section: Source Localisation By Geometric Methodsmentioning

confidence: 99%

Structural damage localisation by acoustic emission technique: A state of the art review

Sengupta

Datta

Topdar

2015

Lat. Am. j. solids struct.

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Structural damages are often associated with under-performance of an engineering system. Hence localisation of such damages, followed by remedial measures, is the key to ensure proper functioning of the structures during their design lives. Acoustic emission (AE) technique is one of the effective non destructive evaluation (NDE) techniques for damage localisation. The present study makes an effort to review the existing literature on this technique under a few broad categories and discuss chronological advancements in each such category. The advantages and drawbacks of each method are deliberated and further scopes of research are pointed out.

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Section: Source Localisation By Geometric Methodsmentioning

confidence: 99%

Structural damage localisation by acoustic emission technique: A state of the art review

Sengupta

Datta

Topdar

2015

Lat. Am. j. solids struct.

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“…Often the wave velocities in two principal directions are used to locate sources in the composite materials, such as the elliptical wave front triangulation method 6 which was combined with Rayleigh maximum likelihood estimate 7 to locate impacts in composite aircraft panels. 8 Koabaz et al 9 used an experimentally derived wave velocity and developed the work of others 10 to realise an improved objective function in an optimisation scheme to locate impacts on a composite panel. For structures with increasing complexity, Geiger's method and a variable velocity model were used to locate micro-cracks in cemented total hip arthroplasty.…”

Section: Ae Source Locationmentioning

confidence: 99%

Improved acoustic emission source location during fatigue and impact events in metallic and composite structures

Pearson

Eaton

Featherston

et al. 2016

Structural Health Monitoring

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In order to overcome the difficulties in applying traditional time-of-arrival techniques for locating acoustic emission events in complex structures and materials, a technique termed 'Delta-t mapping' was developed. This article presents a significant improvement on this, in which the difficulties in identifying the precise arrival time of an acoustic emission signal are addressed by incorporating the Akaike information criteria. The performance of the time of arrival, the Delta-t mapping and the Akaike information criteria Delta-t mapping techniques is assessed by locating artificial acoustic emission sources, fatigue damage and impact events in aluminium and composite materials, respectively. For all investigations conducted, the improved Akaike information criteria Delta-t technique shows a reduction in average Euclidean source location error irrespective of material or source type. For locating Hsu-Nielsen sources on a complex aluminium specimen, the average source location error (Euclidean) is 32.6 (time of arrival), 5.8 (Delta-t) and 3 mm (Akaike information criteria Delta-t). For locating fatigue damage on the same specimen, the average error is 20.2 (time of arrival), 4.2 (Delta-t) and 3.4 mm (Akaike information criteria Delta-t). For locating Hsu-Nielsen sources on a composite panel, the average error is 19.3 (time of arrival), 18.9 (Delta-t) and 4.2 mm (Akaike information criteria Delta-t). Finally, the Akaike information criteria Delta-t mapping technique had the lowest average error (3.3 mm) when locating impact events when compared with the Delta-t (18.9 mm) and time of arrival (124.7 mm) techniques. Overall, the Akaike information criteria Delta-t mapping technique is the only technique which demonstrates consistently the lowest average source location error (greatest average error of 4.2 mm) when compared with the Delta-t (greatest average error of 18.9 mm) and time of arrival (greatest average error of 124.7 mm) techniques. These results demonstrate that the Akaike information criteria Delta-t mapping technique is a viable option for acoustic emission source location, increasing the accuracy and likelihood of damage detection, irrespective of material, geometry and source type.

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“…AE sources, such as impact with foreign objects 3) , fatigue cracks initiation and growth 4) , rubbing 5) , and ber breakage 6) , can generate the propagation of elastic waves. Most of the information about damage and deformation of structures can be obtained by AE method.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission Monitoring of Laser Shock Peening by Detection of Underwater Acoustic Wave

et al. 2016

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Acoustic Emission (AE) technique is one of the nondestructive methods to evaluate the size, location and generation time of deformation or damage of material in real times. Generally AE sensors are directly attached on the surface of the component to detect AE wave, however this method brings about inconvenient setting to many industrial processes. In the present study, an arrangement of AE sensors was investigated to monitor laser shock peening (LSP). Instead of direct attachment of the sensors on the target, several AE sensors were located in the water layer to detect acoustic wave propagating through the water. The results showed that the sensor arrangement has a good performance to monitor LSP. Impact pressures during LSP process were obtained from detected AE waveforms by deconvolution technique. In addition, with AE measurement, sample surface was observed by high speed camera and investigated phenomena during LSP process.

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Locating point of impact in anisotropic fiber reinforced composite plates

Cited by 184 publications

References 17 publications

Structural damage localisation by acoustic emission technique: A state of the art review

Structural damage localisation by acoustic emission technique: A state of the art review

Improved acoustic emission source location during fatigue and impact events in metallic and composite structures

Acoustic Emission Monitoring of Laser Shock Peening by Detection of Underwater Acoustic Wave

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