Optimal orientation of fibre composites for strength based on Hashin’s criteria optimality conditions

Ferreira, Rafael T.L.; Ashcroft, Ian A.

doi:10.1007/s00158-019-02462-w

Additive manufacturing of Nd-Fe-B permanent magnets and their application in electrical machines (2024)
Journal Article
Wu, J., Korman, O., Di Nardo, M., Degano, M., Gerada, C., Ashcroft, I., J.M. Hague, R., & T. Aboulkhair, N. (2024). Additive manufacturing of Nd-Fe-B permanent magnets and their application in electrical machines. IEEE Access, 12, 138921-138931. https://doi.org/10.1109/ACCESS.2024.3436643

Powder Bed Fusion - Laser Beam (PBF-LB), a form of additive manufacturing (AM) for Nd-Fe-B permanent magnets, is attracting substantial interest for its ability to process functional magnetic materials while capitalizing on AM's design flexibility an... Read More about Additive manufacturing of Nd-Fe-B permanent magnets and their application in electrical machines.

Using cohesive zone models with digital image correlation to obtain a mixed mode I/II fracture envelope of a tough epoxy (2023)
Journal Article
Jackson, C. M., McGuire, J. A., Losada, M. E., Maskery, I., Ashcroft, I., De Vita, R., & Dillard, D. A. (2024). Using cohesive zone models with digital image correlation to obtain a mixed mode I/II fracture envelope of a tough epoxy. Engineering Fracture Mechanics, 295, Article 109732. https://doi.org/10.1016/j.engfracmech.2023.109732

This work describes a method in which the digital image correlation (DIC) method and finite element analysis (FEA) were used to create a quasi-static mixed-mode fracture envelope for bonded joints consisting of 2024-T3 Al adherends and a tough struct... Read More about Using cohesive zone models with digital image correlation to obtain a mixed mode I/II fracture envelope of a tough epoxy.

The impact of the risk of build failure on energy consumption in additive manufacturing (2022)
Journal Article
Wang, H., Baumers, M., Basak, S., He, Y., & Ashcroft, I. (2022). The impact of the risk of build failure on energy consumption in additive manufacturing. Journal of Industrial Ecology, 26(5), 1771-1783. https://doi.org/10.1111/jiec.13318

Additive manufacturing (AM), also known as 3D printing, is associated with significant promise in the manufacturing sector. However, it has been shown that the risk of build failure has a substantial impact on the costs of AM and that this results fr... Read More about The impact of the risk of build failure on energy consumption in additive manufacturing.

Exploiting Generative Design for Multi-Material Inkjet 3D Printed Cell Instructive, Bacterial Biofilm Resistant Composites (2022)
Preprint / Working Paper
he, Y., Begines, B., Trindade, G., Abdi, M., dubern, J., Prina, E., …Wildman, R. Exploiting Generative Design for Multi-Material Inkjet 3D Printed Cell Instructive, Bacterial Biofilm Resistant Composites

As our understanding of disease grows, it is becoming established that treatment needs to be personalized and targeted to the needs of the individual. In this paper we show that multi-material inkjet-based 3D printing, when backed with generative des... Read More about Exploiting Generative Design for Multi-Material Inkjet 3D Printed Cell Instructive, Bacterial Biofilm Resistant Composites.

On the thermomechanical aging of LPBF alloy 718 (2022)
Journal Article
Sanchez, S., Gaspard, G., Hyde, C. J., Ashcroft, I. A., Ravi, G. A., & Clare, A. T. (2022). On the thermomechanical aging of LPBF alloy 718. Materials Science and Engineering: A, 841, Article 142998. https://doi.org/10.1016/j.msea.2022.142998

Heat treatment of products post additive manufacture are considered hugely important since the metallurgical condition post process is suboptimal. In the case of nickel-based superalloys, grain size, precipitate distribution and precipitate size are... Read More about On the thermomechanical aging of LPBF alloy 718.

Continuous fibre composite 3D printing with pultruded carbon/PA6 commingled fibres: Processing and mechanical properties (2022)
Journal Article
Zhuo, P., Li, S., Ashcroft, I., & Jones, I. A. (2022). Continuous fibre composite 3D printing with pultruded carbon/PA6 commingled fibres: Processing and mechanical properties. Composites Science and Technology, 221, Article 109341. https://doi.org/10.1016/j.compscitech.2022.109341

Continuous Fibre composite 3D printing (CF-3DP) technology is a newly developed Additive Manufacturing (AM) process. By employing continuous fibre as a reinforcement for the composite, the mechanical properties of the 3D printed part can be significa... Read More about Continuous fibre composite 3D printing with pultruded carbon/PA6 commingled fibres: Processing and mechanical properties.

Reactive Jetting of High Viscosity Nanocomposites for Dielectric Elastomer Actuation (2022)
Journal Article
Malas, A., Saleh, E., Giménez‐López, M. D. C., Rance, G. A., Helps, T., Taghavi, M., …Goodridge, R. D. (2022). Reactive Jetting of High Viscosity Nanocomposites for Dielectric Elastomer Actuation. Advanced Materials Technologies, 7(6), Article 2101111. https://doi.org/10.1002/admt.202101111

The layer-by-layer nature of additive manufacturing is well matched to the layer construction of stacked dielectric actuators, with inkjet printing offering a unique opportunity due to its droplet-on-demand capability, suitable for multi-material pro... Read More about Reactive Jetting of High Viscosity Nanocomposites for Dielectric Elastomer Actuation.

FLatt Pack: A research-focussed lattice design program (2021)
Journal Article
Maskery, I., Parry, L. A., Padrão, D., Hague, R., & Ashcroft, I. A. (2022). FLatt Pack: A research-focussed lattice design program. Additive Manufacturing, 49, Article 102510. https://doi.org/10.1016/j.addma.2021.102510

Lattice structures are an important aspect of design for additive manufacturing (DfAM). They enable significant component light-weighting and the tailoring of a wide range of physical responses; mechanical, thermal, acoustic, etc. In turn, lattice de... Read More about FLatt Pack: A research-focussed lattice design program.

Low thermal expansion machine frame designs using lattice structures (2021)
Journal Article
Juasiripukdee, P., Maskery, I., Ashcroft, I., & Leach, R. (2021). Low thermal expansion machine frame designs using lattice structures. Applied Sciences, 11(19), Article 9135. https://doi.org/10.3390/app11199135

In this work, we investigated tessellating cellular (or lattice) structures for use in a low thermal expansion machine frame. We proposed a concept for a lattice structure with tailorable effective coefficient of thermal expansion (CTE). The design i... Read More about Low thermal expansion machine frame designs using lattice structures.

Process-structure-property relationships in laser powder bed fusion of permanent magnetic Nd-Fe-B (2021)
Journal Article
Wu, J., Aboulkhair, N. T., Degano, M., Ashcroft, I., & Hague, R. J. (2021). Process-structure-property relationships in laser powder bed fusion of permanent magnetic Nd-Fe-B. Materials and Design, 209, Article 109992. https://doi.org/10.1016/j.matdes.2021.109992

Laser powder-bed fusion (L-PBF), as an additive manufacturing (AM) technique, has demonstrated excellent capabilities in achieving degrees of freedom in manufacturing that are otherwise unattainable. The potential of combining Nd-Fe-B as a permanent... Read More about Process-structure-property relationships in laser powder bed fusion of permanent magnetic Nd-Fe-B.

Material extrusion additive manufacturing of continuous fibre reinforced polymer matrix composites: A review and outlook (2021)
Journal Article
Zhuo, P., Li, S., Ashcroft, I. A., & Jones, A. I. (2021). Material extrusion additive manufacturing of continuous fibre reinforced polymer matrix composites: A review and outlook. Composites Part B: Engineering, 224, Article 109143. https://doi.org/10.1016/j.compositesb.2021.109143

In recent years, three-dimensional printing (3DP) technology has developed to include composite materials. Most of the development to date in this area has involved particulate or short fibre reinforced composites, whilst continuous fibre printing re... Read More about Material extrusion additive manufacturing of continuous fibre reinforced polymer matrix composites: A review and outlook.

Powder Bed Fusion of nickel-based superalloys: A review (2021)
Journal Article
Sanchez, S., Xu, Z., Smith, P., Gaspard, G., Hyde, C. J., Ashcroft, I. A., …Clare, A. T. (2021). Powder Bed Fusion of nickel-based superalloys: A review. International Journal of Machine Tools and Manufacture, 165, Article 103729. https://doi.org/10.1016/j.ijmachtools.2021.103729

Powder Bed Fusion (PBF) techniques constitute a family of Additive Manufacturing (AM) processes, which are characterised by high design flexibility and no tooling requirement. This makes PBF techniques attractive to many modern manufacturing sectors... Read More about Powder Bed Fusion of nickel-based superalloys: A review.

Multi-laser scan strategies for enhancing creep performance in LPBF (2021)
Journal Article
Sanchez, S., Hyde, C. J., Clare, A. T., & Ashcroft, I. A. (2021). Multi-laser scan strategies for enhancing creep performance in LPBF. Additive Manufacturing, 41, Article 101948. https://doi.org/10.1016/j.addma.2021.101948

Laser Powder Bed Fusion (LPBF) enables complex structures to be manufactured, which is attractive to industries where augmented service performance can be achieved. However, the build time of LPBF can be slower than traditional manufacturing processe... Read More about Multi-laser scan strategies for enhancing creep performance in LPBF.

The creep behaviour of nickel alloy 718 manufactured by laser powder bed fusion (2021)
Journal Article
Sanchez, S., Gaspard, G., Hyde, C., Ashcroft, I., Ravi, G., & Clare, A. (2021). The creep behaviour of nickel alloy 718 manufactured by laser powder bed fusion. Materials and Design, 204, Article 109647. https://doi.org/10.1016/j.matdes.2021.109647

Components manufactured by laser powder bed fusion (LPBF) are limited by their performance for use in critical applications. LPBF materials have microstructural defects, such as suboptimal grain size and morphology, and macroscale anomalies, such as... Read More about The creep behaviour of nickel alloy 718 manufactured by laser powder bed fusion.

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.

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, Article 101548. 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.

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.

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