All Outputs (31)

3D geometric modelling of discontinuous fibre composites using a force-directed algorithm (2016)
Journal Article
Harper, L., Qian, C., Luchoo, R., & Warrior, N. (2017). 3D geometric modelling of discontinuous fibre composites using a force-directed algorithm. Journal of Composite Materials, 51(17), 2389-2406. https://doi.org/10.1177/0021998316672722

A geometrical modelling scheme is presented to produce representative architectures for discontinuous fibre composites, enabling downstream modelling of mechanical properties. The model generates realistic random fibre architectures containing high f... Read More about 3D geometric modelling of discontinuous fibre composites using a force-directed algorithm.

Defect formation during preforming of a bi-axial non-crimp fabric with a pillar stitch pattern (2016)
Journal Article
Chen, S., McGregor, O., Harper, L., Endruweit, A., & Warrior, N. (2016). Defect formation during preforming of a bi-axial non-crimp fabric with a pillar stitch pattern. Composites Part A: Applied Science and Manufacturing, 91, 156-167. https://doi.org/10.1016/j.compositesa.2016.09.016

To capture the asymmetrical shear behaviour of a bi-axial NCF with a pillar stitch, a non-orthogonal constitutive model was developed and implemented in finite element forming simulations. Preforming experiments indicate that the local distribution o... Read More about Defect formation during preforming of a bi-axial non-crimp fabric with a pillar stitch pattern.

Optimisation of composite bone plates for ulnar transverse fractures (2016)
Journal Article
Chakladar, N. D., Harper, L. T., & Parsons, A. J. (2016). Optimisation of composite bone plates for ulnar transverse fractures. Journal of the Mechanical Behavior of Biomedical Materials, 57, https://doi.org/10.1016/j.jmbbm.2016.01.029

Metallic bone plates are commonly used for arm bone fractures where conservative treatment (casts) cannot provide adequate support and compression at the fracture site. These plates, made of stainless steel or titanium alloys, tend to shield stress t... Read More about Optimisation of composite bone plates for ulnar transverse fractures.

Formability optimisation of fabric preforms by controlling material draw-in through in-plane constraints (2015)
Journal Article
Chen, S., Harper, L., Endruweit, A., & Warrior, N. (2015). Formability optimisation of fabric preforms by controlling material draw-in through in-plane constraints. Composites Part A: Applied Science and Manufacturing, 76, https://doi.org/10.1016/j.compositesa.2015.05.006

A genetic algorithm is coupled with a finite element model to optimise the arrangement of constraints for a composite press-forming study. A series of springs are used to locally apply in-plane tension through clamps to the fibre preform to control m... Read More about Formability optimisation of fabric preforms by controlling material draw-in through in-plane constraints.

Inter-ply stitching optimisation of highly drapeable multi-ply preforms (2015)
Journal Article
Chen, S., Endruweit, A., Harper, L., & Warrior, N. (2015). Inter-ply stitching optimisation of highly drapeable multi-ply preforms. Composites Part A: Applied Science and Manufacturing, 71, https://doi.org/10.1016/j.compositesa.2015.01.016

An efficient finite element model has been developed in Abaqus/Explicit to solve highly non-linear fabric forming problems, using a non-orthogonal constitutive relation and membrane elements to model bi-axial fabrics. 1D cable-spring elements have be... Read More about Inter-ply stitching optimisation of highly drapeable multi-ply preforms.

Heterogeneity of discontinuous carbon fibre composites: damage initiation captured by Digital Image Correlation (2014)
Journal Article
Johanson, K., Harper, L., Johnson, M. S., & Warrior, N. (2015). Heterogeneity of discontinuous carbon fibre composites: damage initiation captured by Digital Image Correlation. Composites Part A: Applied Science and Manufacturing, 68, https://doi.org/10.1016/j.compositesa.2014.10.014

This paper aims to identify architectural features which lead to damage initiation and failure in discontinuous carbon fibre composites formed from randomly orientated bundles. A novel multi-camera digital image correlation system was used to simulta... Read More about Heterogeneity of discontinuous carbon fibre composites: damage initiation captured by Digital Image Correlation.

Mechanical, degradation and cytocompatibility properties of magnesium coated phosphate glass fibre reinforced polycaprolactone composites (2014)
Journal Article
Liu, X., Hasan, M. S., Grant, D. M., Harper, L. T., Parsons, A. J., Palmer, G., …Ahmed, I. (2014). Mechanical, degradation and cytocompatibility properties of magnesium coated phosphate glass fibre reinforced polycaprolactone composites. Journal of Biomaterials Applications, 29(5), https://doi.org/10.1177/0885328214541302

Retention of mechanical properties of phosphate glass fibre reinforced degradable polyesters such as polycaprolactone and polylactic acid in aqueous media has been shown to be strongly influenced by the integrity of the fibre/polymer interface. A pre... Read More about Mechanical, degradation and cytocompatibility properties of magnesium coated phosphate glass fibre reinforced polycaprolactone composites.

The influence of coupling agent, fibre sizing and matrix degradation on the interfacial shear strength between carbon fibre and polypropylene (2014)
Presentation / Conference Contribution
Burn, D., Harper, L., Johnson, M., Warrior, N., Yang, L., & Thomason, J. (2014, June). The influence of coupling agent, fibre sizing and matrix degradation on the interfacial shear strength between carbon fibre and polypropylene. Paper presented at 16th European Conference on Composite Materials, Seville, Spain

The interface strength between carbon fibre (CF) and polypropylene (PP) was characterised using the microbond test. The effect of removing the sizing from the fibres, as well as introducing a maleic anhydride grafted polypropylene (MAPP) coupling age... Read More about The influence of coupling agent, fibre sizing and matrix degradation on the interfacial shear strength between carbon fibre and polypropylene.

Studying the heterogeneity of discontinuous fiber composites using a new full-field strain measurement system (2013)
Presentation / Conference Contribution
Johanson, K., Harper, L. T., Johnson, M., Kennedy, A., & Warrior, N. A. (2013, July). Studying the heterogeneity of discontinuous fiber composites using a new full-field strain measurement system. Paper presented at ICCM International Conferences on Composite Materials, Montréal, Canada

In this paper a new multi camera digital image correlation (DIC) system is used to view strain fields from opposing surfaces of discontinuous carbon fiber composites loaded in tension. The system is investigated to understand if DIC can be used to co... Read More about Studying the heterogeneity of discontinuous fiber composites using a new full-field strain measurement system.

Initial mechanical properties of phosphate-glass fibre-reinforced rods for use as resorbable intramedullary nails (2012)
Journal Article
Felfel, R. M., Ahmed, I., Parsons, A. J., Harper, L. T., & Rudd, C. D. (2012). Initial mechanical properties of phosphate-glass fibre-reinforced rods for use as resorbable intramedullary nails. Journal of Materials Science, 47(12), 4884-4894. https://doi.org/10.1007/s10853-012-6355-9

This paper investigates the use of novel phosphate- glass fibre-reinforced rods as resorbable intramedullary nails. Random and unidirectional fibres were moulded into composite rods by forging at ∼100 °C. Rods produced using non-woven random mats (RM... Read More about Initial mechanical properties of phosphate-glass fibre-reinforced rods for use as resorbable intramedullary nails.

Influence of screw holes and gamma sterilization on properties of phosphate glass fiber-reinforced composite bone plates (2011)
Journal Article
Han, N., Ahmed, I., Parsons, A. J., Harper, L., Scotchford, C. A., Scammell, B. E., & Rudd, C. D. (2013). Influence of screw holes and gamma sterilization on properties of phosphate glass fiber-reinforced composite bone plates. Journal of Biomaterials Applications, 27(8), 990-1002. https://doi.org/10.1177/0885328211431855

Polymers prepared from polylactic acid (PLA) have found a multitude of uses as medical devices. For a material that degrades, the main advantage is that an implant would not necessitate a second surgical event for removal. In this study, fibers produ... Read More about Influence of screw holes and gamma sterilization on properties of phosphate glass fiber-reinforced composite bone plates.