All Outputs (84)

Laser powder bed fusion of soda lime silica glass: optimisation of processing parameters and evaluation of part properties (2021)
Journal Article
Datsiou, K. C., Spirrett, F., Ashcroft, I., Magallanes, M., Christie, S., & Goodridge, R. (2021). Laser powder bed fusion of soda lime silica glass: optimisation of processing parameters and evaluation of part properties. Additive Manufacturing, 39, Article 101880. https://doi.org/10.1016/j.addma.2021.101880

Glass has a number of attractive properties, such as transparency, chemical resistance, good thermal stability and high electrical resistivity , that make it a favourable material for a range of applications, including medical technology, electronics... Read More about Laser powder bed fusion of soda lime silica glass: optimisation of processing parameters and evaluation of part properties.

A framework for differentiation in composed digital-physical products (2020)
Journal Article
Baumers, M., Ashcroft, I., Benford, S., Flintham, M., Koleva, B., Tóth, Z., & Winklhofer, H. (2020). A framework for differentiation in composed digital-physical products. International Journal of Mechatronics and Manufacturing Systems, 13(4), 286-298. https://doi.org/10.1504/IJMMS.2020.112351

Product-service systems (PSS) composed of physical products and digital services are emerging as an important new product category. In this paper we suggest that the established metaphor of 'layering' is insufficient to capture the diverse ways in wh... Read More about A framework for differentiation in composed digital-physical products.

Development and Testing of Soft Magnetic Rotor for a Switched Reluctance Motor Built Through Additive Manufacturing Technology (2020)
Conference Proceeding
Gargalis, L., Madonna, V., Giangrande, P., Rocca, R., Ashcroft, I., Hague, R., & Galea, M. (2020). Development and Testing of Soft Magnetic Rotor for a Switched Reluctance Motor Built Through Additive Manufacturing Technology. In 2020 23rd International Conference on Electrical Machines and Systems (ICEMS) (263-268). https://doi.org/10.23919/icems50442.2020.9290893

Additive manufacturing, commonly known as 3D printing, is an emerging technology that is gaining considerable research interest in recent years. In particular, metal printing methodologies might be successfully employed in developing lightweight and... Read More about Development and Testing of Soft Magnetic Rotor for a Switched Reluctance Motor Built Through Additive Manufacturing Technology.

3D Printing as a Technology Enabler for Electrical Machines: Manufacturing and Testing of a Salient Pole Rotor for SRM (2020)
Conference Proceeding
Gargalis, L., Madonna, V., Giangrande, P., Hardy, M., Ashcroft, I., Galea, M., & Hague, R. (2020). 3D Printing as a Technology Enabler for Electrical Machines: Manufacturing and Testing of a Salient Pole Rotor for SRM. In 2020 International Conference on Electrical Machines (ICEM) (12-18). https://doi.org/10.1109/icem49940.2020.9270737

Among the various technology enablers for modern electrical machines, additive manufacturing plays a key role. The advantage of having a precise control of the shape of ferromagnetic structures, whilst achieving good electromagnetic performance, fits... Read More about 3D Printing as a Technology Enabler for Electrical Machines: Manufacturing and Testing of a Salient Pole Rotor for SRM.

Additive Manufacturing and Testing of a Soft Magnetic Rotor for a Switched Reluctance Motor (2020)
Journal Article
Gargalis, L., Madonna, V., Giangrande, P., Rocca, R., Hardy, M., Ashcroft, I., …Hague, R. (2020). Additive Manufacturing and Testing of a Soft Magnetic Rotor for a Switched Reluctance Motor. IEEE Access, 8, 206982-206991. https://doi.org/10.1109/ACCESS.2020.3037190

Additive manufacturing is acknowledged as a key enabling technology, although its adoption is still constrained to niche applications. A promising area for this technology is the production of electrical machines (EMs) and/or their main components (e... Read More about Additive Manufacturing and Testing of a Soft Magnetic Rotor for a Switched Reluctance Motor.

Understanding Mechanical Properties in Fused Filament Fabrication of Polyether Ether Ketone (2020)
Journal Article
Pu, J., McIlroy, C., Jones, A., & Ashcroft, I. (2021). Understanding Mechanical Properties in Fused Filament Fabrication of Polyether Ether Ketone. Additive Manufacturing, 37, Article 101673. https://doi.org/10.1016/j.addma.2020.101673

Using dynamic mechanical analysis (DMA), we investigate differences in the mechanical properties of a single-filament wall of polyether ether ketone (PEEK) constructed using fused filament fabrication (FFF) under a range of different printing conditi... Read More about Understanding Mechanical Properties in Fused Filament Fabrication of Polyether Ether Ketone.

The deformation and elastic anisotropy of a new gyroid-based honeycomb made by laser sintering (2020)
Journal Article
Maskery, I., & Ashcroft, I. A. (2020). The deformation and elastic anisotropy of a new gyroid-based honeycomb made by laser sintering. Additive Manufacturing, 36, https://doi.org/10.1016/j.addma.2020.101548

© 2020 The Author(s) The stiffness, anisotropy and structural deformation of three gyroid-based lattices was investigated, with particular focus on a newly proposed honeycomb gyroid. This honeycomb is based on a modified triply periodic minimal surfa... Read More about The deformation and elastic anisotropy of a new gyroid-based honeycomb made by laser sintering.

Generation of graded porous structures by control of process parameters in the selective laser melting of a fixed ratio salt-metal feedstock (2020)
Journal Article
Aboulkhair, N. T., Zhao, G., Hague, R. J., Kennedy, A. R., Ashcroft, I. A., & Clare, A. T. (2020). Generation of graded porous structures by control of process parameters in the selective laser melting of a fixed ratio salt-metal feedstock. Journal of Manufacturing Processes, 55, 249-253. https://doi.org/10.1016/j.jmapro.2020.04.039

The demonstration of salt dissolution incorporated within laser powder-bed fusion fabrication processes has allowed the creation of complex porous structures without the need for sophisticated design algorithms. This serves to simplify the process, f... Read More about Generation of graded porous structures by control of process parameters in the selective laser melting of a fixed ratio salt-metal feedstock.

Phase-field modelling of brittle fracture in thin shell elements based on the MITC4+ approach (2020)
Journal Article
Pillai, U., Triantafyllou, S. P., Ashcroft, I., Essa, Y., & de la Escalera, F. M. (2020). Phase-field modelling of brittle fracture in thin shell elements based on the MITC4+ approach. Computational Mechanics, 65, 1413–1432. https://doi.org/10.1007/s00466-020-01827-z

We present a phase field based MITC4+ shell element formulation to simulate fracture propagation in thin shell structures. The employed MITC4+ approach renders the element shear- and membrane- locking free, hence providing high-fidelity fracture simu... Read More about Phase-field modelling of brittle fracture in thin shell elements based on the MITC4+ approach.

Optimal orientation of fibre composites for strength based on Hashin’s criteria optimality conditions (2020)
Journal Article
Ferreira, R. T., & Ashcroft, I. A. (2020). Optimal orientation of fibre composites for strength based on Hashin’s criteria optimality conditions. Structural and Multidisciplinary Optimization, 61, 2155–2176. https://doi.org/10.1007/s00158-019-02462-w

© 2020, The Author(s). The Hashin’s strength criteria are usually employed in first ply failure and damage-onset analysis of fibre-reinforced composites. This work presents optimality conditions of local material orientations for these criteria, in t... Read More about Optimal orientation of fibre composites for strength based on Hashin’s criteria optimality conditions.

The Effects of Feature Sizes in Selectively Laser Melted Ti-6Al-4V Parts on the Validity of Optimised Process Parameters (2019)
Journal Article
Phutela, C., Aboulkhair, N. T., Tuck, C. J., & Ashcroft, I. (2019). The Effects of Feature Sizes in Selectively Laser Melted Ti-6Al-4V Parts on the Validity of Optimised Process Parameters. Materials, 13(1), https://doi.org/10.3390/ma13010117

Ti-6Al-4V is a popular alloy due to its high strength-to-weight ratio and excellent corrosion resistance. Many applications of additively manufactured Ti-6Al-4V using selective laser melting (SLM) have reached technology readiness. However, issues li... Read More about The Effects of Feature Sizes in Selectively Laser Melted Ti-6Al-4V Parts on the Validity of Optimised Process Parameters.

Technique for Processing of Continuous Carbon Fibre Reinforced PEEK for Fused Filament Fabrication (2019)
Conference Proceeding
Pu, J., Saleh, E., Ashcroft, I., & Jones, A. (2019). Technique for Processing of Continuous Carbon Fibre Reinforced PEEK for Fused Filament Fabrication

3D printing of light-weight and mechanically-strong structures facilitates several applications. 3D printing of continuous carbon fibre reinforced polyetheretherketone (PEEK) presents exciting possibilities as the high stiffness and strength of the h... Read More about Technique for Processing of Continuous Carbon Fibre Reinforced PEEK for Fused Filament Fabrication.

Electrical resistivity of pure copper processed by medium-powered laser powder bed fusion additive manufacturing for use in electromagnetic applications (2019)
Journal Article
Silbernagel, C., Gargalis, L., Ashcroft, I., Hague, R., Galea, M., & Dickens, P. (2019). Electrical resistivity of pure copper processed by medium-powered laser powder bed fusion additive manufacturing for use in electromagnetic applications. Additive Manufacturing, 29, https://doi.org/10.1016/j.addma.2019.100831

Pure copper is an excellent thermal and electrical conductor, however, attempts to process it with additive manufacturing (AM) technologies have seen various levels of success. While electron beam melting (EBM) has successfully processed pure copper... Read More about Electrical resistivity of pure copper processed by medium-powered laser powder bed fusion additive manufacturing for use in electromagnetic applications.

3D printing of Aluminium alloys: Additive Manufacturing of Aluminium alloys using selective laser melting (2019)
Journal Article
Aboulkhair, N. T., Simonelli, M., Parry, L., Ashcroft, I., Tuck, C., & Hague, R. (2019). 3D printing of Aluminium alloys: Additive Manufacturing of Aluminium alloys using selective laser melting. Progress in Materials Science, 106, https://doi.org/10.1016/j.pmatsci.2019.100578

© 2019 The Authors Metal Additive Manufacturing (AM) processes, such as selective laser melting (SLM), enable the fabrication of arbitrary 3D-structures with unprecedented degrees of freedom. Research is rapidly progressing in this field, with promis... Read More about 3D printing of Aluminium alloys: Additive Manufacturing of Aluminium alloys using selective laser melting.

Additive manufacturing of glass with laser powder bed fusion (2019)
Journal Article
Datsiou, K. C., Saleh, E., Spirrett, F., Goodridge, R., Ashcroft, I., & Eustice, D. A. (2019). Additive manufacturing of glass with laser powder bed fusion. Journal of the American Ceramic Society, 102(8), 4410-4414. https://doi.org/10.1111/jace.16440

Its transparency, aesthetic appeal, chemical inertness and electrical resistivity make glass an excellent candidate for small and large‐scale applications in the chemical, electronics, automotive, aerospace and architectural industries. Additive manu... Read More about Additive manufacturing of glass with laser powder bed fusion.

Direct-writing by active tooling in electrochemical jet processing (2019)
Journal Article
Mitchell-Smith, J., Bisterov, I., Speidel, A., Ashcroft, I., & Clare, A. T. (2019). Direct-writing by active tooling in electrochemical jet processing. Manufacturing Letters, 19, 15-20. https://doi.org/10.1016/j.mfglet.2019.01.001

Recent innovations in electrochemical jet processing have caused step changes in process flexibility and precision. However, utilisation of these innovations requires the development of new machine tool technology. Presented here is a new methodology... Read More about Direct-writing by active tooling in electrochemical jet processing.

Geometrical effects on residual stress in selective laser melting (2018)
Journal Article
Parry, L., Ashcroft, I., & Wildman, R. (2019). Geometrical effects on residual stress in selective laser melting. Additive Manufacturing, 25, 166-175. https://doi.org/10.1016/j.addma.2018.09.026

Selective laser melting is an increasingly attractive technology for the manufacture of complex and low volume / high value metal parts. However, the inevitable residual stresses that are generated can lead to defects or build failure. Due to the com... Read More about Geometrical effects on residual stress in selective laser melting.

Targeted rework of powder bed fusion additive manufacturing (2018)
Conference Proceeding
Dryburgh, P., Patel, R., Catchpole-Smith, S., Hirsch, M., Parry, L., Smith, R. J., …Clare, A. T. (2018). Targeted rework of powder bed fusion additive manufacturing. In Proceedings of LPM2018 - the 19th International Symposium on Laser Precision Microfabrication (#18/030)

There is a clear industrial pull to fabricate high value components using premium high temperature aerospace materials by additive manufacturing. Inconveniently, the same materials’ properties which allow them to perform well in service render them... Read More about Targeted rework of powder bed fusion additive manufacturing.

Effective design and simulation of surface-based lattice structures featuring volume fraction and cell type grading (2018)
Journal Article
Maskery, I., Aremu, A., Parry, L., Wildman, R., Tuck, C., & Ashcroft, I. (2018). Effective design and simulation of surface-based lattice structures featuring volume fraction and cell type grading. Materials and Design, 155, 220-232. https://doi.org/10.1016/j.matdes.2018.05.058

In this paper we present a numerical investigation into surface-based lattice structures with the aim of facilitating their design for additive manufacturing. We give the surface equations for these structures and show how they can be used to tailor... Read More about Effective design and simulation of surface-based lattice structures featuring volume fraction and cell type grading.

Compressive failure modes and energy absorption in additively manufactured double gyroid lattices (2018)
Journal Article
Maskery, I., Aboulkhair, N. T., Aremu, A., Tuck, C., & Ashcroft, I. (in press). Compressive failure modes and energy absorption in additively manufactured double gyroid lattices. Additive Manufacturing, 16, https://doi.org/10.1016/j.addma.2017.04.003

Lattice structures are excellent candidates for lightweight, energy absorbing applications such as personal protective equipment. In this paper we explore several important aspects of lattice design and production by metal additive manufacturing, inc... Read More about Compressive failure modes and energy absorption in additively manufactured double gyroid lattices.