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Browsing by Author "Martina, Filomeno"

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Analysis of fracture toughness properties of wire + arc additive manufactured high strength low alloy structural steel components

Dirisu, Philip; Ganguly, Supriyo; Mehmanparast, Ali; Martina, Filomeno; Williams, Stewart W. (Elsevier, 2020-08-14)

The uncertainty surrounding the fracture behaviour of CMT-WAAM deposited steel, in terms of crack tip condition (J and CTOD) needed to cause crack tip extension, has made this manufacturing technique unpopular to date. ...
Analytical process model for wire + arc additive manufacturing

Sergio, Rios; Colegrove, Paul A.; Martina, Filomeno; Williams, Stewart W. (Elsevier, 2018-04-03)

An analytical process model for predicting the layer height and wall width from the process parameters was developed for wire + arc additive manufacture of Ti-6Al-4V, which includes inter-pass temperature and material ...
Analytical process model for wire + arc additive manufacturing

Ríos, Sergio; Colegrove, Paul A.; Martina, Filomeno; Williams, Stewart W. (Elsevier, 2018-04-03)

An analytical process model for predicting the layer height and wall width from the process parameters was developed for wire + arc additive manufacture of Ti-6Al-4V, which includes inter-pass temperature and material ...
Application of bulk deformation methods for microstructural and material property improvement and residual stress and distortion control in additively manufactured components

Colegrove, Paul A.; Donoghue, J.; Martina, Filomeno; Gu, Jianglong; Prangnell, P. B.; Honnige, Jan (Elsevier, 2016-11-08)

Many additively manufactured (AM) materials have properties that are inferior to their wrought counterparts, which impedes industrial implementation of the technology. Bulk deformation methods, such as rolling, applied ...
A comparative study of additive manufacturing techniques: Residual stress and microstructural analysis of CLAD and WAAM printed Ti-6Al-4V components

Szost, Blanka A.; Terzi, Sofiane; Martina, Filomeno; Boisselier, Didier; Prytuliak, Anastasiia A.; Pirling, Thilo; Hofmann, Michael; Jarvis, David John (Elsevier, 2015-09-28)

Nowadays, there is a great manufacturing trend in producing higher quality net-shape components of challenging geometries. One of the major challenges faced by additive manufacturing (AM) is the residual stresses generated ...
Compression behaviour of wire+ arc additive manufactured structures

Abbaszadeh, Masoud; Ventzke, Volker; Neto, Leonor; Riekehr, Stefan; Martina, Filomeno; Kashaev, Nikolai; Hönnige, Jan; Williams, Stewart; Klusemann, Benjamin (MDPI, 2021-05-27)

Increasing demand for producing large-scale metal components via additive manufacturing requires relatively high building rate processes, such as wire + arc additive manufacturing (WAAM). For the industrial implementation ...
Defining next-generation additive manufacturing applications for the Ministry of Defence (MoD)

Busachi, Alessandro; Erkoyuncu, John Ahmet; Colegrove, Paul A.; Drake, Richard; Watts, Chris; Martina, Filomeno (Elsevier, 2016-11-02)

“Additive Manufacturing” (AM) is an emerging, highly promising and disruptive technology which is catching the attention of the Defence sector due to the versatility it is offering. Through the combination of design freedom, ...
Design for additive manufacturing: Trends, opportunities, considerations, and constraints

Thompson, Mary Kathryn; Moroni, Giovanni; Vaneker, Tom; Fadel, Georges; Campbell, R. Ian; Gibson, Ian; Bernard, Alain; Schulz, Joachim; Graf, Patricia; Ahuja, Bhrigu; Martina, Filomeno (Elsevier, 2016-06-25)

The past few decades have seen substantial growth in Additive Manufacturing (AM) technologies. However, this growth has mainly been process-driven. The evolution of engineering design to take advantage of the possibilities ...
Design for wire + arc additive manufacture: design rules and build orientation selection

Lockett, Helen L.; Ding, Jialuo; Williams, Stewart W.; Martina, Filomeno (Taylor & Francis, 2017-08-20)

Wire + Arc Additive Manufacture (WAAM) is an additive manufacturing technology that can produce near net-shape parts layer by layer in an automated manner using welding technology controlled by a robot or CNC machine. WAAM ...
Design of an empirical process model and algorithm for the Tungsten Inert Gas wire+arc additive manufacture of TI-6AL-4V components

Martina, Filomeno; Williams, Stewart W.; Colegrove, Paul A. (University of Texas, 2013-08-31)

In the wire+arc additive manufacture process parameters can be varied to achieve a wide range of deposit widths, as well as layer heights. Pulsed Tungsten Inert Gas was chosen as the deposition process. A working envelope ...
Designing a WAAM based manufacturing system for defence applications

Busachi, Alessandro; Erkoyuncu, John Ahmet; Colegrove, Paul A.; Martina, Filomeno; Ding, Jialuo (Elsevier, 2015-10-09)

Current developments in “Wire+Arc Additive Manufacturing” (WAAM) have demonstrated the suitability of the technology for rapid, delocalized and flexible manufacturing. Providing a defence platform with the ability of ...
Development of Wire + Arc additive manufacture for the production of large-scale unalloyed tungsten components

Marinelli, Gianrocco; Martina, Filomeno; Ganguly, Supriyo; Williams, Stewart W. (Elsevier, 2019-05-11)

The manufacturing of refractory-metals components presents some limitations induced by the materials' characteristic low-temperature brittleness and high susceptibility to oxidation. Powder metallurgy is typically the ...
Development of wire and arc additive manufacture for large scale application for the energy industry.

Dirisu, Philip (2019-10)

Wire + arc additive manufacture (WAAM), as the most discussed tool in manufacturing, can complement the design of a fully optimised structure through multi-material deposition and incorporation of geometric design features ...
Effect of deposition strategies on fatigue crack growth behaviour of wire+ arc additive manufactured titanium alloy Ti-6Al-4V

Syed, Abdul Khadar; Zhang, Xiang; Davis, Alec E.; Kennedy, Jacob R.; Martina, Filomeno; Ding, Jialuo; Williams, Stewart; Prangnell, Philip B. (Elsevier, 2021-04-03)

The influence of three deposition strategies on the fatigue crack growth behaviour of Wire + Arc Additive Manufactured (WAAM) Ti–6Al–4V has been investigated in the as-built condition. Test samples were prepared using ...
The effect of loading direction on strain localisation in wire arc additively manufactured Ti–6Al–4V

Lunt, David; Ho, Alistair; Davis, Alec E.; Harte, Allan; Martina, Filomeno; da Fonseca, João Quinta; Prangnell, Philip (Elsevier, 2020-05-21)

Ti–6Al–4V microstructures produced by high deposition rate Wire Arc Additive Manufacturing (WAAM) can be both heterogeneous and anisotropic. Key features of the as-built microstructures include; large columnar ß grains, ...
Effect of shielding gas composition and welding speed on autogenous welds of unalloyed tungsten plates

Marinelli, Gianrocco; Martina, Filomeno; Ganguly, Supriyo; Williams, Stewart W. (Elsevier, 2019-07-30)

Tungsten usually exhibits poor weldability and marked brittleness at room temperature. This causes tungsten welds to be affected by the evolution of cracks along the weld bead, which can be eliminated by using a pre-heating ...
The effectiveness of combining rolling deformation with wire-arc additive manufacture on β-Grain refinement and texture modification in Ti-6Al-4V

Donoghue, J.; Anthonysamy, A. A.; Martina, Filomeno; Colegrove, Paul A.; Williams, Stewart W.; Prangnell, P. B. (Elsevier, 2016-02-08)

In Additive Manufacture (AM), with the widely used titanium alloy Ti–6Al–4V, the solidification conditions typically result in undesirable, coarse-columnar, primary β grain structures. This can result in a strong texture ...
Fatigue crack growth in additive manufactured titanium: residual stress control and life evaluation method development

Zhang, Xiang; Martina, Filomeno; Syed, Abdul Khadar; Wang, Xueyuan; Ding, Jialuo; Williams, Stewart W. (VTT Information Service, 2017-06-09)

This paper presents fatigue crack growth behaviour in titanium alloy Ti-6Al-4V built by the Wire + Arc Additive Manufacture (WAAM®) process. Process induced residual stress and stress relief by cold working were measured ...
Fracture toughness and fatigue crack growth rate properties in wire + arc additive manufactured Ti-6Al-4V

Zhang, Xiang; Martina, Filomeno; Ding, Jialuo; Wang, X.; Williams, Stewart W. (Wiley, 2016-11-29)

This paper presents an experimental investigation of the fracture and fatigue crack growth properties of Ti-6Al-4V produced by the Wire + Arc Additive Manufacture (WAAM) process. First, fracture toughness was measured for ...
Functionally graded structures of refractory metals by Wire Arc Additive Manufacturing

Marinelli, Gianrocco; Martina, Filomeno; Ganguly, Supriyo; Williams, Stewart W.; Lewtas, Heather; Hancock, David (Maney Publishing, 2019-03-11)

Functionally graded components are usually preferred for severe and critical service conditions, thanks to the possibility of achieving different complementary material properties within the same structure. Wire + Arc ...

Browsing by Author "Martina, Filomeno"

Browsing by Author "Martina, Filomeno"

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