ORCID Profile
0000-0002-1187-5430
Current Organisation
Rutgers The State University of New Jersey
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Publisher: MDPI AG
Date: 27-05-2023
DOI: 10.3390/S23115131
Abstract: The use of guided wave-based Ultrasonic Testing (UT) for monitoring Polyethylene (PE) pipes is mostly restricted to detecting defects in welded zones, despite its ersified success in monitoring metallic pipes. PE’s viscoelastic behavior and semi-crystalline structure make it prone to crack formation under extreme loads and environmental factors, which is a leading cause of pipeline failure. This state-of-the-art study aims to demonstrate the potential of UT for detecting cracks in non-welded regions of natural gas PE pipes. Laboratory experiments were conducted using a UT system consisting of low-cost piezoceramic transducers assembled in a pitch-catch configuration. The litude of the transmitted wave was analyzed to study wave interaction with cracks of different geometries. The frequency of the inspecting signal was optimized through wave dispersion and attenuation analysis, guiding the selection of third- and fourth- order longitudinal modes for the study. The findings revealed that cracks with lengths equal to or greater than the wavelength of the interacting mode were more easily detectable, while smaller crack lengths required greater crack depths for detection. However, there were potential limitations in the proposed technique related to crack orientation. These insights were validated using a finite element-based numerical model, confirming the potential of UT for detecting cracks in PE pipes.
Publisher: AIP Publishing
Date: 24-03-2017
DOI: 10.1063/1.4979025
Abstract: Intense gaseous ion beams are created from compact microwave plasmas confined in a multicusp magnetic field. The wave frequency (ω) is comparable to the electron plasma frequency (ωpe) and ⪢ the ion plasma frequency (ωpi) therefore, the heavier plasma (ions) are least disturbed by the high frequency electromagnetic waves. By changing the experimental gas, ion beams of different species are obtained, which expands the applicability of the ion beams. For the same applied accelerating potential, the controllability of the beam current owing to different velocities for different ionic species adds to the enhanced functionality. The ion beams are utilized to create a variety of microstructures by direct writing on metallic substrates, and microstructures of a high aspect ratio (ar = line width/depth) in the range of 100–1000 are created by varying the ion species and writing speed. For fixed species (Ga) and low current (1 pA) focused ion beam systems, typically ar ∼ 2.0 to 9.3 may be realized in a single beam scan. A parameter called current normalized force, defined as the momentum transfer per unit time, normalized with the beam current helps in understanding the different momentum transferred to the target s le upon impact by the ion beams of variable species. A mathematical formulation is developed to demonstrate this aspect.
Publisher: ASME International
Date: 08-06-2020
DOI: 10.1115/1.4047191
Abstract: Steel structures with bolted joints are easily dismantled and repurposed. However, maintaining joint integrity is a challenge. This paper reports a non-destructive methodology to monitor steel bolted joints. Piezoelectric ceramic patches have been surface bonded in the joint for transmission and reception of guided ultrasonic waves. Both single and multiple bolted joints have been investigated. It has been demonstrated that the variation in acoustic impedance due at the bolt interface can be discerned and calibrated with bolt torque level. The recorded reflections from interfaces are used as inputs for a newly developed imaging algorithm. The proposed method has the potential to be a reference-free and fully automated method.
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 08-2019
Publisher: DEStech Publications, Inc.
Date: 15-11-2019
Location: United States of America
No related grants have been discovered for Jay Shah.