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Dr LEE HARPER's Outputs (54)

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.

Flow characteristics of carbon fibre sheet moulding compounds (2015)
Presentation / Conference Contribution
Evans, A. D., Qian, C. C., Harper, L. T., Warrior, N. A., Brookbank, P., & Savage, L. (2015, July). Flow characteristics of carbon fibre sheet moulding compounds. Presented at 20th ICCM International Conferences on Composite Materials, Copenhagen, Denmark

© 2015 International Committee on Composite Materials. All rights reserved. This paper presents the development of a low cost carbon fibre moulding compound using a robotic spray deposition process, developed at the University of Nottingham. Directed... Read More about Flow characteristics of carbon fibre sheet moulding compounds.

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.

A study of an improved cutting mechanism of composite materials using novel design of diamond micro-core drills (2014)
Journal Article
Butler-Smith, P. W., Axinte, D. A., Daine, M., Kennedy, A. R., Harper, L. T., Bucourt, J. F., & Ragueneau, R. (2015). A study of an improved cutting mechanism of composite materials using novel design of diamond micro-core drills. International Journal of Machine Tools and Manufacture, 88, 175-183. https://doi.org/10.1016/j.ijmachtools.2014.10.002

Core drilling at small diameters in carbon composite materials is largely carried out using diamond electroplated tools consisting of hollow shafts and simplistic geometries that are likely to work in an abrasional/rubbing mode for material removal.... Read More about A study of an improved cutting mechanism of composite materials using novel design of diamond micro-core drills.

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.

Structural optimisation of random discontinuous fibre composites: Part 2 - case study (2014)
Journal Article
Qian, C., Harper, L., Turner, T., & Warrior, N. (2015). Structural optimisation of random discontinuous fibre composites: Part 2 - case study. Composites Part A: Applied Science and Manufacturing, 68, Article 417-424. https://doi.org/10.1016/j.compositesa.2014.09.004

This is the second paper in a two part series presenting the development of a stiffness optimisation algorithm to intelligently optimise the fibre architecture of discontinuous fibre composites. A Multi-Criteria Decision Making (MCDM) strategy is use... Read More about Structural optimisation of random discontinuous fibre composites: Part 2 - case study.

Structural optimisation of random discontinuous fibre composites: Part 1 – Methodology (2014)
Journal Article
Qian, C., Harper, L., Turner, T., & Warrior, N. (2015). Structural optimisation of random discontinuous fibre composites: Part 1 – Methodology. Composites Part A: Applied Science and Manufacturing, 68, 406-416. https://doi.org/10.1016/j.compositesa.2014.08.024

This paper presents a finite element model to optimise the fibre architecture of components manufactured from discontinuous fibre composites. An optimality criterion method has been developed to maximise global component stiffness, by determining opt... Read More about Structural optimisation of random discontinuous fibre composites: Part 1 – Methodology.

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., Rudd, C. D., & 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.