Proceedings ArticleDOI
A study of internal structure in components made by additive manufacturing process using 3 D X-ray tomography
K. Raguvarun,Krishnan Balasubramaniam,Prabhu Rajagopal,Suresh Palanisamy,Romesh Nagarajah,Nicholas P Hoye,Dominic Curiri,Ajay Kapoor +7 more
- Vol. 1650, Iss: 1, pp 146-155
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TLDR
In this paper, the wire-arc additive manufacturing (AM) process based on gas tungsten arc welding (GTAW) has been examined for the internal structure and constitution of components generated by the process.Abstract:
Additive manufacturing methods are gaining increasing popularity for rapidly and efficiently manufacturing parts and components in the industrial context, as well as for domestic applications. However, except when used for prototyping or rapid visualization of components, industries are concerned with the load carrying capacity and strength achievable by additive manufactured parts. In this paper, the wire-arc additive manufacturing (AM) process based on gas tungsten arc welding (GTAW) has been examined for the internal structure and constitution of components generated by the process. High-resolution 3D X-ray tomography is used to gain cut-views through wedge-shaped parts created using this GTAW additive manufacturing process with titanium alloy materials. In this work, two different control conditions for the GTAW process are considered. The studies reveal clusters of porosities, located in periodic spatial intervals along the sample cross-section. Such internal defects can have a detrimental effect on the strength of the resulting AM components, as shown in destructive testing studies. Closer examination of this phenomenon shows that defect clusters are preferentially located at GTAW traversal path intervals. These results highlight the strong need for enhanced control of process parameters in ensuring components with minimal defects and higher strength.read more
Citations
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Journal ArticleDOI
X-ray computed tomography for additive manufacturing: a review
TL;DR: In this article, the use of X-ray computed tomography (XCT) is examined, identifying the requirement for volumetric dimensional measurements in industrial verification of additively manufactured (AM) parts.
Journal ArticleDOI
Microstructural porosity in additive manufacturing: The formation and detection of pores in metal parts fabricated by powder bed fusion
Antonella Sola,Alireza Nouri +1 more
Journal ArticleDOI
Challenges of additive manufacturing technologies from an optimisation perspective
TL;DR: A critical opinion on optimal design is delivered to show limits, benefits and ways of improvement in additive manufacturing and differences that may appear between virtual and real design are explored.
Journal ArticleDOI
Laser ultrasonic inspection of additive manufactured components
Geo Davis,Geo Davis,Romesh Nagarajah,Suresh Palanisamy,R.A. Rahman Rashid,Prabhu Rajagopal,Krishnan Balasubramaniam +6 more
TL;DR: The results demonstrate laser ultrasonic testing (LUT) as a promising method for the non-contact inspection of additive manufactured components and the results were validated using X-ray computed tomography and ultrasonic immersion testing.
Journal ArticleDOI
Deep subwavelength ultrasonic imaging using optimized holey structured metamaterials
TL;DR: The experimental demonstration of deep subwavelength ultrasonic imaging of defects in metallic samples with a feature size of λ/25 using holey-structured metamaterial lenses shows how the extraordinary transmission capacity of holey structured metam material comes about by the coupling of higher frequencies in the incident ultrasonic wave field to resonant modes of the lens.
References
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TL;DR: In this paper, the authors reviewed various slicing approaches developed for tessellated as well as actual CAD models for laminated manufacturing and compared them with real CAD models with different slice thickness.
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Neil Hopkinson,Phill Dickens +1 more
TL;DR: In this article, a cost analysis performed by De Montfort University and Delphi Automotive Systems (France) along with expert opinions generated from an Internet based conference has helped to identify the potential future for rapid manufacturing.
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