Laser generation of narrowband lamb waves for in-situ inspection of additively manufactured metal components
Geo Davis,Prabhu Rajagopal,Krishnan Balasubramaniam,Suresh Palanisamy,Romesh Nagarajah +4 more
- Vol. 2102, Iss: 1, pp 070001
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TLDR
In this article, narrow band lamb wave modes were generated using a pulsed Nd-YAG laser system consisting of a spatial array illumination source, which enabled generation of specific Lamb wave modes for in-situ inspection of additively manufactured components.Abstract:
Recent developments in metal additive manufacturing (AM) has created a lot of interest in sectors including automotive, aerospace and biomedical engineering. It is imperative that the components manufactured additively be inspected for flaws, mechanical properties and dimensional accuracy. Several non-destructive testing (NDT) techniques such as X-ray computed tomography and conventional ultrasonic testing have been implemented to evaluate the quality of these components. Recently, research has been focused on techniques that can perform non-contact testing and carry out an online inspection layer by layer while the component is being fabricated. Laser based ultrasonic technique has been found to be a promising method owing to its non-contact nature and ability to operate in harsh environments. In our study, narrow band lamb waves were generated using a pulsed Nd-YAG laser system consisting of a spatial array illumination source. The generated wave modes were detected using a two-wave mixing based laser interferometer. The wavelength-matched method enabled generation of specific lamb wave modes for in-situ inspection of additively manufactured components.read more
Citations
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Journal ArticleDOI
On the Use of X-ray Computed Tomography in Assessment of 3D-Printed Components
TL;DR: A brief review of 3D printing processes and evolution of CT technology is presented and documented data proved that CT is an appropriate non-contact technique for technical evaluation of various printed parts.
Journal ArticleDOI
Additively manufactured integrated slit mask for laser ultrasonic guided wave inspection
Geo Davis,Geo Davis,Krishnan Balasubramaniam,Suresh Palanisamy,Romesh Nagarajah,Prabhu Rajagopal +5 more
TL;DR: In this article, the authors proposed a method for generating narrowband ultrasonic guided waves using an additively manufactured slit mask that is integrated onto the component during selective laser melting (SLM) process.
Journal ArticleDOI
Damage visualization using laser-generated residual guided waves with optimization of laser scanning path
TL;DR: In this article, the formation of residual wavefield is investigated and an optimization method of laser scanning path is developed to improve the damage visualization using the residual guided waves, which is intensively used in guided wave-based non-destructive testing due to its noncontact scanning, automated scanning path and full wavefield measurement.
Journal ArticleDOI
Ultrasonic testing of thick and thin Inconel 625 alloys manufactured by laser powder bed fusion.
TL;DR: In this paper , a phased array ultrasonic testing (PAUT) is suggested to inspect thick LPBF components, while guided waves are explored for thin curved ones, and the results are compared to defect images predicted by finite element simulations.
Journal ArticleDOI
Damage visualization using laser-generated residual guided waves with optimization of laser scanning path
Paris D. Butler,Matthew Brewer +1 more
TL;DR: In this article , the formation of residual wavefield is investigated and an optimization method of laser scanning path is developed to improve the damage visualization using the residual guided waves, which is intensively used in guided wave-based non-destructive testing due to its noncontact scanning, automated scanning path and full wavefield measurement.
References
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Book
Laser Ultrasonics Techniques and Applications
C B Scruby,L E Drain +1 more
TL;DR: In this paper, the authors describe the characteristics of laser light for ultrasonics, including the acousto-optic effect, the measurement of ultrasonic fields Bragg diffraction, and the interaction of light with surface waves.
Journal ArticleDOI
Spatially resolved acoustic spectroscopy for selective laser melting
TL;DR: In this paper, a spatially resolved acoustic spectroscopy (SRAS) technique is applied to prepare additively manufactured material to measure the material properties and identify defects, and the number of pore size remains the same for 140 W to 190 W melting power (mean: 115-119 μm optical and 134-137 μm velocity).
Journal ArticleDOI
Inspection of additive-manufactured layered components
TL;DR: Experimental outcomes prove that typical micro-defects due to the layer-by-layer deposition process, such as near-surface and surface flaws in a single layer deposit, can be detected.
Journal ArticleDOI
Experimental evaluation of enhanced generation of ultrasonic waves using an array of laser sources
TL;DR: In this paper, an array of ten pulsed Nd: YAG lasers was constructed in order to study the effects of generating ultrasonic signals from a single laser source in the thermo-elastic regime.
Journal ArticleDOI
The laser‐generated ultrasonic phased array: Analysis and experiments
TL;DR: In this article, the impulse directivity patterns of laser-generated longitudinal acoustic waves have been computed for duraluminum samples in the thermoelastic regime and steel sample in the ablation regime.
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