All Outputs (31)

Characterisation of process-induced variability in wrinkle defects during double diaphragm forming of non-crimp fabric (2024)
Journal Article
Codolini, A., Chen, S., Lawrence, G., Harper, L., & Sutcliffe, M. (2024). Characterisation of process-induced variability in wrinkle defects during double diaphragm forming of non-crimp fabric. Composites Part B: Engineering, 281, Article 111549. https://doi.org/10.1016/j.compositesb.2024.111549

Experiments and numerical simulations are employed to determine the critical process variables that affect the quality of a two-layer biaxial non-crimp fabric (NCF) preformed using the double diaphragm forming (DDF) process. To prevent wrinkling defe... Read More about Characterisation of process-induced variability in wrinkle defects during double diaphragm forming of non-crimp fabric.

The Relationship Between the Extent of Indentation and Impact Damage in Carbon-Fibre Reinforced-Plastic Composites after a Low-Velocity Impact (2024)
Journal Article
Brooks, R. A., Liu, J., Hall, Z. E., Joesbury, A. M., Harper, L. T., Liu, H., …Dear, J. P. (2024). The Relationship Between the Extent of Indentation and Impact Damage in Carbon-Fibre Reinforced-Plastic Composites after a Low-Velocity Impact. Applied Composite Materials, https://doi.org/10.1007/s10443-024-10223-2

The present paper investigates the low-velocity impact behaviour of carbon-fibre reinforced-plastic (CFRP) composite panels and the damage incurred when they are subjected to a single impact. The relationship between the depth of permanent surface in... Read More about The Relationship Between the Extent of Indentation and Impact Damage in Carbon-Fibre Reinforced-Plastic Composites after a Low-Velocity Impact.

Thermoplastic composite injection-overmoulding with indirectly-loaded reinforcement: Design for manufacture (2024)
Journal Article
Parsons, A. J., Chen, S., Ryder, A., Bradley, D., Warrior, N. A., & Harper, L. T. (2024). Thermoplastic composite injection-overmoulding with indirectly-loaded reinforcement: Design for manufacture. Composite Structures, 337, Article 118056. https://doi.org/10.1016/j.compstruct.2024.118056

Thermoplastic Overmoulding is an emerging manufacturing method combining low-cost, high-rate injection moulding with continuous fibre composite elements. The combination of materials with dissimilar stiffnesses can create stress concentrations and wa... Read More about Thermoplastic composite injection-overmoulding with indirectly-loaded reinforcement: Design for manufacture.

Two-dimensional to three-dimensional dry fibre preforming (2023)
Book Chapter
Chen, S., & Harper, L. (2023). Two-dimensional to three-dimensional dry fibre preforming. In Design and Manufacture of Structural Composites (101-123). Elsevier. https://doi.org/10.1016/B978-0-12-819160-6.00005-6

Preforming is the process of converting two-dimensional (2D) intermediate fibre products, such as fabrics and mats, into complex three-dimensional (3D) shapes to resemble the geometry of the final component. Preforming is a necessary step for all liq... Read More about Two-dimensional to three-dimensional dry fibre preforming.

Design and Manufacture of Structural Composites (2023)
Book
Harper, L., & Clifford, M. (Eds.). (2023). Design and Manufacture of Structural Composites. Elsevier. https://doi.org/10.1016/c2018-0-05165-8

Design and Manufacture of Structural Composites provides an overview of the main manufacturing challenges encountered when processing fibre-reinforced composite materials. Composites are unique in that the material is created at the same time as the... Read More about Design and Manufacture of Structural Composites.

Cost, rate, and robustness (2023)
Book Chapter
Hancock, S., & Harper, L. (2023). Cost, rate, and robustness. In Design and Manufacture of Structural Composites (447-471). Elsevier. https://doi.org/10.1016/B978-0-12-819160-6.00022-6

This chapter outlines the most important considerations for the economic evaluation of composites, as assessing both cost and performance in parallel is critical for designing and manufacturing efficient applications. The cost of raw materials is oft... Read More about Cost, rate, and robustness.

Introduction (2023)
Book Chapter
Harper, L., & Clifford, M. (2023). Introduction. In Design and Manufacture of Structural Composites (3-17). Elsevier. https://doi.org/10.1016/b978-0-12-819160-6.00009-3

Fibre-reinforced polymer composites are acknowledged to offer some of the highest specific properties (stiffness, strength) of any engineering materials, but this chapter takes a look at why these materials are not more widely adopted for general str... Read More about Introduction.

Modelling the effects of patch-plug configuration on the impact performance of patch-repaired composite laminates (2023)
Journal Article
Liu, H., Liu, J., Hall, Z. E., Brooks, R. A., Crocker, J. W., Joesbury, A. M., …Dear, J. P. (2023). Modelling the effects of patch-plug configuration on the impact performance of patch-repaired composite laminates. Composites Science and Technology, 233, Article 109917. https://doi.org/10.1016/j.compscitech.2023.109917

The patch-plug configuration has been widely used to repair composite structures and restore the structural integrity of damaged composites. In the present research, single-sided CFRP patch-repaired panels, with different patch-plug configurations, a... Read More about Modelling the effects of patch-plug configuration on the impact performance of patch-repaired composite laminates.

Experimental and numerical investigations on the impact behaviour of pristine and patch-repaired composite laminates (2022)
Journal Article
Liu, H., Brooks, R. A., Hall, Z. E., Liu, J., Crocker, J. W., Joesbury, A. M., …Dear, J. P. (2022). Experimental and numerical investigations on the impact behaviour of pristine and patch-repaired composite laminates. Philosophical Transactions A: Mathematical, Physical and Engineering Sciences, 380(2232), Article 20210340. https://doi.org/10.1098/rsta.2021.0340

The present paper investigates the impact behaviour of both pristine carbon-fibre-reinforced-plastic (CFRP) composite laminates and repaired CFRP laminates. For the patch-repaired CFRP specimen, the pristine CFRP panel specimen has been damaged by cu... Read More about Experimental and numerical investigations on the impact behaviour of pristine and patch-repaired composite laminates.

Multiscale viscoplastic modeling of recycled glass fiber-reinforced thermoplastic composites: Experimental and numerical investigations (2022)
Journal Article
Nachtane, M., Meraghni, F., Chatzigeorgiou, G., Harper, L., & Pelascini, F. (2022). Multiscale viscoplastic modeling of recycled glass fiber-reinforced thermoplastic composites: Experimental and numerical investigations. Composites Part B: Engineering, 242, Article 110087. https://doi.org/10.1016/j.compositesb.2022.110087

One of the main challenges facing fiber-reinforced polymer composites is the lack of options for end-of-life recycling. The environmental impact of waste materials disposed of at landfill sites, by incineration, or by erratic dispersion in the enviro... Read More about Multiscale viscoplastic modeling of recycled glass fiber-reinforced thermoplastic composites: Experimental and numerical investigations.

Simulating the effect of fabric bending stiffness on the wrinkling behaviour of biaxial fabrics during preforming (2021)
Journal Article
Yu, F., Chen, S., Harper, L., & Warrior, N. (2021). Simulating the effect of fabric bending stiffness on the wrinkling behaviour of biaxial fabrics during preforming. Composites Part A: Applied Science and Manufacturing, 143, Article 106308. https://doi.org/10.1016/j.compositesa.2021.106308

A macroscopic finite element model has been established to investigate the forming-induced wrinkling behaviour for bi-axial fabrics. Results indicate that using a linear bending model with a constant bending stiffness produces unrealistic wrinkle pat... Read More about Simulating the effect of fabric bending stiffness on the wrinkling behaviour of biaxial fabrics during preforming.

Solid epoxy resin systems for automated composite manufacturing (2020)
Journal Article
Yousefi, N., Evans, A. D., Harper, L. T., Maples, H. A., James, T., & Bismarck, A. (2021). Solid epoxy resin systems for automated composite manufacturing. Composites Part A: Applied Science and Manufacturing, 142, Article 106205. https://doi.org/10.1016/j.compositesa.2020.106205

© 2020 The Author(s) Thermosetting resins were formulated by mixing solid epoxy components, hardener and accelerator at elevated temperature. These mixtures were ground into uncured, solid resin powders and dispensed onto carbon fibres using a powder... Read More about Solid epoxy resin systems for automated composite manufacturing.

The behaviour of thermoplastic and thermoset carbon-fibre composites subjected to low-velocity and high-velocity impact (2020)
Journal Article
Liu, H., Liu, J., Ding, Y., Zheng, J., Kong, X., Zhou, J., …Dear, J. P. (2020). The behaviour of thermoplastic and thermoset carbon-fibre composites subjected to low-velocity and high-velocity impact. Journal of Materials Science, 55, 15741–15768. https://doi.org/10.1007/s10853-020-05133-0

The present paper describes the results from experimental and theoretical modelling studies on the behaviour of continuous carbon-fibre/polymer matrix composites subjected to a relatively low-velocity or high-velocity impact, using a rigid, metallic... Read More about The behaviour of thermoplastic and thermoset carbon-fibre composites subjected to low-velocity and high-velocity impact.

A macroscale finite element approach for simulating the bending behaviour of biaxial fabrics (2020)
Journal Article
Yu, F., Chen, S., Viisainen, J., Sutcliffe, M., Harper, L., & Warrior, N. (2020). A macroscale finite element approach for simulating the bending behaviour of biaxial fabrics. Composites Science and Technology, 108078. https://doi.org/10.1016/j.compscitech.2020.108078

A macroscale finite element (FE) model was developed to simulate the forming behaviour of biaxial fabrics, incorporating the effects of bending stiffness to predict fabric wrinkling. The dependency of the bending stiffness on the fibre orientation wa... Read More about A macroscale finite element approach for simulating the bending behaviour of biaxial fabrics.

Optimisation of local in-plane constraining forces in double diaphragm forming (2018)
Journal Article
Chen, S., McGregor, O. P., Harper, L. T., Endruweit, A., & Warrior, N. A. (2018). Optimisation of local in-plane constraining forces in double diaphragm forming. Composite Structures, 201, 570-581. https://doi.org/10.1016/j.compstruct.2018.06.062

© 2018 Elsevier Ltd Rigid blocks (risers) were introduced in the double diaphragm forming (DDF) process to change the local in-plane strain distribution in the diaphragms, aimed at reducing wrinkling defects in the production of fabric preforms. A tw... Read More about Optimisation of local in-plane constraining forces in double diaphragm forming.

Simulating damage onset and evolution in fully bio-resorbable composite under three-point bending (2018)
Journal Article
Gao, X., Chen, M., Yang, X., Harper, L., Ahmed, I., & Lu, J. (2018). Simulating damage onset and evolution in fully bio-resorbable composite under three-point bending. Journal of the Mechanical Behavior of Biomedical Materials, 81, https://doi.org/10.1016/j.jmbbm.2018.02.022

This paper presents a strain-based damage model to predict the stress-strain relationship and investigate the damage onset and evolution of the fibre and matrix of a fully bio-resorbable phosphate glass fibre reinforced composite under three-point be... Read More about Simulating damage onset and evolution in fully bio-resorbable composite under three-point bending.

Finite element study of the microdroplet test for interfacial shear strength: Effects of geometric parameters for a carbon fibre/epoxy system (2017)
Journal Article
Zhao, Q., Qian, C., Harper, L., & Warrior, N. (2018). Finite element study of the microdroplet test for interfacial shear strength: Effects of geometric parameters for a carbon fibre/epoxy system. Journal of Composite Materials, 52(16), 2163-2177. https://doi.org/10.1177/0021998317740943

A 3D finite element model has been developed to identify the main causes of variability in the microdroplet test, which is commonly used to characterise the interfacial shear strength between polymer matrices and single filaments. A more realistic dr... Read More about Finite element study of the microdroplet test for interfacial shear strength: Effects of geometric parameters for a carbon fibre/epoxy system.

A water-soluble core material for manufacturing hollow composite sections (2017)
Journal Article
Xiao, Z., Harper, L., Kennedy, A. R., & Warrior, N. (2017). A water-soluble core material for manufacturing hollow composite sections. Composite Structures, 182, https://doi.org/10.1016/j.compstruct.2017.09.058

This paper presents the development of a low-cost water-soluble core material, which is suitable for producing hollow composite structures via high pressure moulding processes, such as compression moulding and resin transfer moulding. The bulk materi... Read More about A water-soluble core material for manufacturing hollow composite sections.

Long discontinuous carbon fibre/polypropylene composites for high volume structural applications (2017)
Journal Article
Harper, L., Burn, D., Johnson, M. S., & Warrior, N. (in press). Long discontinuous carbon fibre/polypropylene composites for high volume structural applications. Journal of Composite Materials, https://doi.org/10.1177/0021998317722204

A processing route is presented to manufacture discontinuous carbon fibre reinforced polypropylene (CF.PP) composites, using much longer fibre lengths (25mm) and higher volume fractions (up to 45%) than previously reported in the literature. Carbon f... Read More about Long discontinuous carbon fibre/polypropylene composites for high volume structural applications.

Compression moulding of composites with hybrid fibre architectures (2016)
Journal Article
Corbridge, D., Harper, L. T., De Focatiis, D. S., & Warrior, N. (2017). Compression moulding of composites with hybrid fibre architectures. Composites Part A: Applied Science and Manufacturing, 95, 87-99. https://doi.org/10.1016/j.compositesa.2016.12.018

Advanced Sheet Moulding Compounds (ASMC) and unidirectional (UD) prepregs have been co-compression moulded to form a hybrid composite material. In-mould flow influences the UD fibre architecture in two ways. When UD fibres are aligned transversely to... Read More about Compression moulding of composites with hybrid fibre architectures.