Journal ArticleDOI
SHM of pipes using torsional waves generated by in situ magnetostrictive tapes
TLDR
In this article, an improved magnetostrictive sensors (MsSs) were used for structural health monitoring (SHM) of hard-to-inspect pipes using polymeric magnetic tape material that is suitable for use in a variety of industries.Abstract:
Long-range, torsional guided waves generated in pipes using magnetostrictive sensors (MsSs) have great potential for applications to the structural health monitoring (SHM) of hard-to-inspect pipes. This paper reports an improved MsS technique (when compared to related techniques currently used for the NDT of pipes) that uses polymeric magnetic tape material that is suitable for use in a variety of industries as an SHM tool for pipes. Improvements include increased efficiency, reduced cost and increased long-term survivability of the sensor system. Transduction efficiency was increased by reducing the sensor eddy current losses and by using a field concentrator strip. For long-term monitoring, a low-cost magnetic oxide based MsS material (video recording tape) having the required magnetic properties was used. The MsS strips were oriented to generate non-dispersive torsional guided ultrasonic waves that propagate long distances with minimal mode conversion. Further, considering both safety and long-term survivability of the sensor, low-power ultrasonic instrumentation was developed and tested. Measurements reported here demonstrate the sensitivity of this sensor to both radial notches (saw cuts) and drilled holes. Results also show that magnetic anisotropy of the strip plays a role in generating torsional waves. It is envisioned that results obtained from the present study will significantly enhance the ability to monitor the long-term structural health of piping systems.read more
Citations
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Journal ArticleDOI
Guided wave based structural health monitoring: A review
TL;DR: In this paper, the authors provide a state-of-the-art review of guided wave based structural health monitoring (SHM) and highlight the future directions and open areas of research in guided wave-based SHM.
Journal ArticleDOI
Review of magnetostrictive patch transducers and applications in ultrasonic nondestructive testing of waveguides.
Yoon Young Kim,Young Eui Kwon +1 more
TL;DR: A variety of state-of-the-art MPT configurations and their applications will be reviewed along with the working principle of this transducer type.
Journal ArticleDOI
SWCNT-thin-film-enabled fiber sensors for lifelong structural health monitoring of polymeric composites - From manufacturing to utilization to failure
Sida Luo,Waris Obitayo,Tao Liu +2 more
TL;DR: In this article, a single-walled carbon nanotube (SWCNT) thin film enabled 1D fiber sensor was used for multipurpose sensing in life-long (from manufacturing to failure) structural health monitoring of high-performance polymeric composites.
Journal ArticleDOI
Beam-focused shear-horizontal wave generation in a plate by a circular magnetostrictive patch transducer employing a planar solenoid array
TL;DR: In this article, a planar solenoid array (PSA) was proposed for focusing Lamb and shear-horizontal (SH) wave beams in a plate generated by a circular magnetostrictive patch transducer.
Journal ArticleDOI
Graphite Nanoplatelet Enabled Embeddable Fiber Sensor for in Situ Curing Monitoring and Structural Health Monitoring of Polymeric Composites
TL;DR: The superior durability of the embedded GNP-FibSen sensor has been demonstrated through 10,000 cycles of coupled electromechanical tests.
References
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Journal ArticleDOI
Joule and Wiedemann Effects-The Simultaneous Generation of Longitudinal and Torsional Stress Pulses in Magnetostrictive Materials
Journal Article
Guided wave flexural mode tuning and focusing for pipe testing
TL;DR: In this article, the potential of beam focusing for ultrasonic guided wave testing of pipes is discussed and a frequency tuning exercise with a new signal display is presented, as well as a few sample experiments.
Journal ArticleDOI
Surface-detached V-shaped yoke of obliquely bonded magnetostrictive strips for high transduction of ultrasonic torsional waves
TL;DR: In this article, the problem of an optimal yoke configuration to increase the sensitivity was formulated as a topology optimization problem, and an interesting V-shaped yoke was found to be the optimal configuration.
Journal ArticleDOI
Effects of the orientation of magnetostrictive nickel strip on torsional wave transduction efficiency of cylindrical waveguides
TL;DR: In this paper, a set of thin magnetostrictive nickel strips are bonded to the surface of a cylindrical waveguide at an oblique angle and a combination of static and dynamic magnetic fields is applied to the strips.
Journal ArticleDOI
The Effect of Discontinuities on the Long-range Propagation of Lamb Waves in Pipes
D. N. Alleyne,Peter Cawley +1 more
TL;DR: In this paper, the L(0, 2) mode is used for long-range (> 15 m) propagation in 2-12 inch (51-305 mm) nominal bore pipes and the behaviour of this mode has been studied using a bonded piezoelectric transducer system.