Inspection of Austenitic Weld With Emats

Gao, Huidong; Ali, S.; López, Borja

doi:10.1063/1.3362187

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…Shear horizontal waves are usually associated with electromagnetic acoustic transducers, or EMAT [14], where SH waves were used for detection of weld defects. SH waves excited by EMAT have shown superiority over conventional shear vertical (SV) and longitudinal waves for detection of weld defects [15]; however, it was suggested that piezoelectric-based transducers generating SH would show better acoustic generation than EMAT [15]. Also, one point to consider is that EMAT needs conductive structures, while PWAS can be used for conductive metallic structures and non-conductive composites (e.g., glass fibre reinforced polymers), not including the fact that SH-PWAS is inexpensive.…”

Section: Introductionmentioning

confidence: 99%

Shear horizontal wave excitation and reception with shear horizontal piezoelectric wafer active sensor (SH-PWAS)

Kamal

Giurgiutiu

2014

Smart Mater. Struct.

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This article discusses shear horizontal (SH) guided-waves that can be excited with shear type piezoelectric wafer active sensor (SH-PWAS). The paper starts with a review of state of the art SH waves modelling and their importance in non-destructive evaluation (NDE) and structural health monitoring (SHM). The basic piezoelectric sensing and actuation equations for the case of shear horizontal piezoelectric wafer active sensor (SH-PWAS) with electromechanical coupling coefficient d 35 are reviewed. Multiphysics finite element modelling (MP-FEM) was performed on a free SH-PWAS to show its resonance modeshapes. The actuation mechanism of the SH-PWAS is predicted by MP-FEM, and modeshapes of excited structure are presented. The structural resonances are compared with experimental measurements and showed good agreement. Analytical prediction of SH waves was performed. SH wave propagation experimental study was conducted between different combinations of SH-PWAS and regular in-plane PWAS transducers. Experimental results were compared with analytical predictions for aluminium plates and showed good agreement. 2D wave propagation effects were studied by MP-FEM. An analytical model was developed for SH wave power and energy. The normal mode expansion (NME) method was used to account for superpositioning multimodal SH waves. Modal participation factors were presented to show the contribution of every mode. Power and energy transfer between SH-PWAS and the structure was analyzed. Finally, we present simulations of our developed wave power and energy analytical models.

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Section: Introductionmentioning

confidence: 99%

Shear horizontal wave excitation and reception with shear horizontal piezoelectric wafer active sensor (SH-PWAS)

Kamal

Giurgiutiu

2014

Smart Mater. Struct.

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“…Though the transduction efficiency of PPM EMATs is lower than for typical piezoelectric and magnetostrictive transducers [ 17 ], they offer noncontact transduction as well as suitable tolerance of radiation and high temperatures. Although the Lorentz force is larger in mild steel and aluminum, it is sufficiently large in stainless steel for NDT/NDI, even at high temperature [ 20 ].…”

Section: Periodic Permanent Magnet (Ppm) Electromagnetic Acoustic mentioning

confidence: 99%

Selection of Shear Horizontal Wave Transducers for Robotic Nondestructive Inspection in Harsh Environments

Choi

Cho

Lissenden

2016

Sensors

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Harsh environments and confined spaces require that nondestructive inspections be conducted with robotic systems. Ultrasonic guided waves are well suited for robotic systems because they can provide efficient volumetric coverage when inspecting for various types of damage, including cracks and corrosion. Shear horizontal guided waves are especially well suited for robotic inspection because they are sensitive to cracks oriented perpendicular or parallel to the wave propagation direction and can be generated with electromagnetic acoustic transducers (EMATs) and magnetostrictive transducers (MSTs). Both types of transducers are investigated for crack detection in a stainless steel plate. The MSTs require the robot to apply a compressive normal force that creates frictional force coupling. However, the coupling is observed to be very dependent upon surface roughness and surface debris. The EMATs are coupled through the Lorentz force and are thus noncontact, although they depend on the lift off between transducer and substrate. After comparing advantages and disadvantages of each transducer for robotic inspection the EMATs are selected for application to canisters that store used nuclear fuel.

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Characterization of Shear Horizontal-Piezoelectric Wafer Active Sensor (SH-PWAS)

Kamal

Giurgiutiu

2014

Composite, Hybrid, and Multifunctional Materials, Volume 4

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Inspection of Austenitic Weld With Emats

Cited by 5 publications

References 2 publications

Shear horizontal wave excitation and reception with shear horizontal piezoelectric wafer active sensor (SH-PWAS)

Shear horizontal wave excitation and reception with shear horizontal piezoelectric wafer active sensor (SH-PWAS)

Selection of Shear Horizontal Wave Transducers for Robotic Nondestructive Inspection in Harsh Environments

Characterization of Shear Horizontal-Piezoelectric Wafer Active Sensor (SH-PWAS)

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