Scattering of ultrasound in solids as visualized by the photoelastic technique

Ying, Cheng; Zhang, S. Y.; Shen, Jianzhong

doi:10.1007/bf00566398

Cited by 21 publications

(12 citation statements)

References 2 publications

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“…9(c)] and no mode conversion to the SH 0 mode occurs. The transverse in-plane displacements of the SH 0 mode are analogous to those of the high-frequency shear bulk waves traditionally used for weep hole inspection (Ying et al, 1984;Nagy et al, 1994;Hassan and Nagy, 1997;Aldrin, 2001). Similarly, they mode convert to circumferential creeping waves on the free surface of the open hole but an additional SH 0 mode is generated at the tip of the notch.…”

Section: The Role Of Fundamental Guided Wave Modes On the Scatterementioning

confidence: 97%

“…However, the top cracks pose a much greater challenge due to them being located sub-surface and effectively hidden by line-of-sight from surface attached actuators. Split aperture wedge transducers have been used to send high-frequency shear-vertical bulk waves from accessible surfaces into wing risers to form circumferential creeping waves on the free surface of open holes (Ying et al, 1984;Nagy et al, 1994;Hassan and Nagy, 1997;Aldrin, 2001;Aldrin et al, 2011). If a defect such as a fatigue crack is present, the circumferential creeping waves are scattered back to the source.…”

Section: Introductionmentioning

confidence: 99%

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Guided wave mode selection for health monitoring of sub-surface hidden defects on fuel weep holes

Doherty

Chiu

2013

The Journal of the Acoustical Society of America

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The in situ health monitoring of defects on the blind side of open holes using ultrasonic plate waves is a challenging problem. Scattering phenomena in this hard-to-inspect region can be used indicate the presence of the defect. This is especially advantageous if these phenomena give rise to the scattering of a wave mode that is unique to the interaction between the incident wave mode and defect. When the defect in question is located within an inaccessible structure, an understanding of how the incident ultrasonic elastic wave field can be scattered from this hidden defect propagates to the accessible surface is important. This paper presents a series of computational investigations to highlight the essential physics that explains the scattering phenomena by a defect located on the blind side of an open hole. The work presented is relevant to the monitoring of defects located in hard-to-inspect regions of future unitized metallic and composite structures. The outcomes advance the knowledge base of inspection of hard-to-access regions with actuators and sensors placed in easily accessible locations.

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Section: The Role Of Fundamental Guided Wave Modes On the Scatterementioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Guided wave mode selection for health monitoring of sub-surface hidden defects on fuel weep holes

Doherty

Chiu

2013

The Journal of the Acoustical Society of America

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“…For these purposes, some visualization systems have been developed using photoelastic or schlieren method (1)(2)(3)(4)(5).…”

Section: Kazuhiro Datementioning

confidence: 99%

Visualization of Ultrasonic Waves in a Solid by Stroboscopic Photoelasticity and Image Processing Techniques

Date

Udagawa²

1989

Review of Progress in Quantitative Nondestructive Evaluation

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“…Then, Dally [10] reviewed the most common imaging recording methods and put forward the possible applications of dynamic photoelasticity. In the 1980s, Ying et al [11][12][13][14][15] did a series of investigations on the scattering of ultrasonic waves in solid medium by the dynamic photoelastic visualization. The results not only verified the conclusion of theoretical analyses, but also showed some new phenomena.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the directivity of ultrasonic scattering field using dynamic photoelastic technique

Jin

Lian

et al. 2014

Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications

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A dynamic photoelastic imaging system is presented and employed to study the directivity of ultrasonic scattering field. Focusing on the cylindrical cavity, photoelastic photograph displays the scattering field, and the directivity patterns of different distances can be plotted by the gray level per pixel. Compared with the simulation results by finite element method (FEM), dynamic photoelastic technique shows more reliable directivity patterns which are in close proximity to the practical scattering field.

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Scattering of ultrasound in solids as visualized by the photoelastic technique

Cited by 21 publications

References 2 publications

Guided wave mode selection for health monitoring of sub-surface hidden defects on fuel weep holes

Guided wave mode selection for health monitoring of sub-surface hidden defects on fuel weep holes

Visualization of Ultrasonic Waves in a Solid by Stroboscopic Photoelasticity and Image Processing Techniques

Investigation on the directivity of ultrasonic scattering field using dynamic photoelastic technique

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