Research Repository

See what's under the surface


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. doi: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

Targeted rework of powder bed fusion additive manufacturing (2018)
Conference Proceeding
Dryburgh, P., Patel, R., Catchpole-Smith, S., Hirsch, M., Perry, 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

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). doi:10.1016/j.matdes.2018.05.058. ISSN 0261-3069

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

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, doi:10.1016/j.addma.2017.04.003. ISSN 2214-7810

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

VOLCO: a predictive model for 3D printed microarchitecture (2018)
Journal Article
Gleadall, A., Ashcroft, I., & Segal, J. (in press). VOLCO: a predictive model for 3D printed microarchitecture. Additive Manufacturing, 21, doi:10.1016/j.addma.2018.04.004. ISSN 2214-7810

Extrusion-based 3D printing is widely used for porous scaffolds in which polymer filaments are extruded in the form of log-pile structures. These structures are typically designed with the assumption that filaments have a continuous cylindrical profi... Read More

Dynamic compressive response of additively manufactured AlSi10Mg alloy hierarchical honeycomb structures (2018)
Journal Article
Zhang, Y., Liu, T., Ren, H., Maskery, I., & Ashcroft, I. (2018). Dynamic compressive response of additively manufactured AlSi10Mg alloy hierarchical honeycomb structures. Composite Structures, 195, (45-59). doi:10.1016/j.compstruct.2018.04.021. ISSN 0263-8223

Periodic honeycombs have been used for their high strength, low weight and multifunctionality. The quasi-static and dynamic compressive responses of three types of additively manufactured AlSi10Mg honeycomb structures, specifically a single-scale hon... Read More

Topology optimization of geometrically nonlinear structures using an evolutionary optimization method (2018)
Journal Article
Abdi, M., Ashcroft, I., & Wildman, R. (in press). Topology optimization of geometrically nonlinear structures using an evolutionary optimization method. Engineering Optimization, doi:10.1080/0305215X.2017.1418864. ISSN 0305-215X

Iso-XFEM method is an evolutionary optimization method developed in our previous studies to enable the generation of high resolution topology optimised designs suitable for additive manufacture. Conventional approaches for topology optimization requi... Read More

Design optimization for an additively manufactured automotive component (2018)
Journal Article
Abdi, M., Ashcroft, I., & Wildman, R. D. (2018). Design optimization for an additively manufactured automotive component. International Journal of Powertrains, 7(1-3), doi:10.1504/IJPT.2018.090371. ISSN 1742-4267

The aim of this paper is to investigate the design optimization and additive manufacture of automotive components. A Titanium brake pedal processed through Selective Laser Melting (SLM) is considered as a test case. Different design optimisation tech... Read More

Targeted rework strategies for powder bed additive manufacture (2017)
Journal Article
Hirsch, M., Dryburgh, P., Catchpole-Smith, S., Patel, R., Parry, L., Sharples, S., …Clare, A. (2018). Targeted rework strategies for powder bed additive manufacture. Additive Manufacturing, 19, (127-133). doi:10.1016/j.addma.2017.11.011. ISSN 2214-7810

A major factor limiting the adoption of powder-bed-fusion additive manufacturing for production of parts is the control of build process defects and the effect these have upon the certification of parts for structural applications. In response to thi... Read More

Strategies for functionally graded lattice structures derived using topology optimisation for additive manufacturing (2017)
Journal Article
Panesar, A., Abdi, M., Hickman, D., & Ashcroft, I. (2018). Strategies for functionally graded lattice structures derived using topology optimisation for additive manufacturing. Additive Manufacturing, 19, doi:10.1016/j.addma.2017.11.008. ISSN 2214-7810

A number of strategies that enable lattice structures to be derived from Topology Optimisation (TO) results suitable for Additive Manufacturing (AM) are presented. The proposed strategies are evaluated for mechanical performance and assessed for AM s... Read More

3D reactive inkjet printing of polydimethylsiloxane (2017)
Journal Article
Sturgess, C., Tuck, C., Ashcroft, I., & Wildman, R. D. (in press). 3D reactive inkjet printing of polydimethylsiloxane. Journal of Materials Chemistry C, 5, doi:10.1039/C7TC02412F. ISSN 2050-7526

Material jetting is a process whereby liquid material can be deposited onto a substrate to solidify. Through a process of progressive additional layers, this deposition can then be used to produce 3D structures. However, the current material jetting... Read More

3D inkjet printing of electronics using UV conversion (2017)
Journal Article
Saleh, E., Zhang, F., He, Y., Vaithilingam, J., Fernandez, J. L., Wildman, R. D., …Tuck, C. (2017). 3D inkjet printing of electronics using UV conversion. Advanced Materials Technologies, 2(10), doi:10.1002/admt.201700134. ISSN 2365-709X

The production of electronic circuits and devices is limited by current manufacturing methods that limit both the form and potentially the performance of these systems. Additive Manufacturing (AM) is a technology that has been shown to provide cross... Read More

A tripropylene glycol diacrylate-based polymeric support ink for material jetting (2017)
Journal Article
He, Y., Zhang, F., Saleh, E., Vaithilingam, J., Aboulkhair, N. T., Begines, B., …Wildman, R. D. (2017). A tripropylene glycol diacrylate-based polymeric support ink for material jetting. Additive Manufacturing, 16, doi:10.1016/j.addma.2017.06.001. ISSN 2214-7810

Support structures and materials are indispensable components in many Additive Manufacturing (AM) systems in order to fabricate complex 3D structures. For inkjet-based AM techniques (known as Material Jetting), there is a paucity of studies on specif... Read More

Selective laser melting of aluminium alloys (2017)
Journal Article
Aboulkhair, N. T., Everitt, N. M., Maskery, I., Ashcroft, I., & Tuck, C. (in press). Selective laser melting of aluminium alloys. MRS Bulletin, 42(4), doi:10.1557/mrs.2017.63. ISSN 0883-7694

Metal additive manufacturing (AM) processes, such as selective laser melting, enable powdered metals to be formed into arbitrary 3D shapes. For aluminium alloys, which are desirable in many high-value applications for their low density and good mecha... Read More

An investigation into the depth and time dependent behavior of UV cured 3D ink jet printed objects (2017)
Journal Article
Chen, X., Ashcroft, I., Tuck, C., He, Y., Hague, R. J., & Wildman, R. D. (2017). An investigation into the depth and time dependent behavior of UV cured 3D ink jet printed objects. Journal of Materials Research, 32(8), (1407-1420). doi:10.1557/jmr.2017.4. ISSN 0884-2914

An ultra-violet (UV) curable ink jet 3D printed material was characterized by an inverse finite element modeling (IFEM) technique employing a nonlinear viscoelastic–viscoplastic (NVEVP) material constitutive model; this methodology was compared direc... Read More

Fractal scan strategies for selective laser melting of ‘unweldable’ nickel superalloys (2017)
Journal Article
Catchpole-Smith, S., Aboulkhair, N., Parry, L., Tuck, C., Ashcroft, I., & Clare, A. (in press). Fractal scan strategies for selective laser melting of ‘unweldable’ nickel superalloys. Additive Manufacturing, doi:10.1016/j.addma.2017.02.002. ISSN 2214-7810

The high thermal gradients experienced during manufacture via selective laser melting commonly result in cracking of high γ/γ′ Nickel based superalloys. Such defects cannot be tolerated in applications where component integrity is of paramount import... Read More