Publications
177 results found
Coccon MN, Pimenta S, Galvanetto U, 2015, HIERARCHICAL SIMULATION OF STRENGTH AND DAMAGE ACCUMULATION IN FIBRE-REINFORCED COMPOSITES UNDER LONGITUDINAL TENSION, 20th International Conference on Composite Materials (ICCM), Publisher: AALBORG UNIV PRESS
Bismarck A, Bacarreza O, Blaker J, et al., 2015, EXPLORING ROUTES TO CREATE HIGH PERFORMANCE PSEUDO-DUCTILE FIBRE REINFORCED COMPOSITES, 20th International Conference on Composite Materials (ICCM), Publisher: AALBORG UNIV PRESS
Khaleque T, Pimenta S, Taylor AC, 2015, HYBRID TOUGHENING OF EPOXY WITH RUBBER AND NANOSILICA PARTICLES: EXPERIMENTS AND MODELLING, 20th International Conference on Composite Materials (ICCM), Publisher: AALBORG UNIV PRESS
Bullegas G, Pinho ST, Pimenta S, 2015, BIO-INSPIRED MICROSTRUCTURE DESIGN TO IMPROVE TRANSLAMINAR FRACTURE TOUGHNESS OF THIN-PLY COMPOSITES, 20th International Conference on Composite Materials (ICCM), Publisher: AALBORG UNIV PRESS
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- Citations: 1
Pimenta S, Ahuja A, Lau AY, 2015, DAMAGE TOLERANT TOW-BASED DISCONTINUOUS COMPOSITES, 20th International Conference on Composite Materials (ICCM), Publisher: AALBORG UNIV PRESS
Grail G, Coq M, Pimenta S, et al., 2015, EXPLORING THE POTENTIAL OF HIERARCHICAL COMPOSITE FIBRE BUNDLES TO IMPROVE THE TENSILE PERFORMANCE OF UNIDIRECTIONAL COMPOSITES, 20th International Conference on Composite Materials (ICCM), Publisher: AALBORG UNIV PRESS
Pimenta S, Robinson P, 2014, An analytical shear-lag model for composites with 'brick-and-mortar' architecture considering non-linear matrix response and failure, Composites Science and Technology, Vol: 104, Pages: 111-124, ISSN: 0266-3538
Discontinuous composites can combine high stiffness and strength with ductility and damage tolerance. This paper presents an analytical shear-lag model for the tensile response of discontinuous composites with a ‘brick-and-mortar’ architecture, composed of regularly staggered stiff platelets embedded in a soft matrix. The formulation is applicable to different types of matrix material (e.g. brittle, perfectly-plastic, strain-hardening), which are modelled through generic piecewise-linear and fracture-mechanics consistent shear constitutive laws. Full composite stress–strain curves are calculated in less than 1 second, thanks to an efficient implementation scheme based on the determination of process zone lengths. Parametric studies show that the model bridges the yield-slip (plasticity) theory and fracture mechanics, depending on platelet thickness, platelet aspect-ratio and matrix constitutive law. The potential for using ‘brick-and-mortar’ architectures to produce composites which are simultaneously strong, stiff and ductile is discussed, and optimised configurations are proposed.
Pinho ST, Pimenta S, 2014, Carbon Fibre Recycling - what goes in, must go somewhere at the end of life, Global Outlook for Carbon Fibre 2014
Pimenta S, Ahuja A, Lau AY, 2014, Uncovering the performance of tow-based discontinuous composites for large-scale markets, Global Outlook for Carbon Fibre 2014
Pimenta S, Pinho ST, 2014, Modelling the translaminar fracture toughness of unidirectional composites, 24th International Workshop on Computational Micromechanics of Materials
Grail G, Pimenta S, Pinho ST, et al., 2014, Exploring the potential of interleaving to delay catastrophic failure in unidirectional composites
Grail G, Pimenta S, Pinho ST, et al., 2014, Thinâply interleaved composite modelling, 24th International Workshop on Computational Micromechanics of Materials
Pimenta S, Robinson P, 2014, Highly extensible wavy-ply sandwich with composite skins and crushable core, 16th European Conference on Composite Materials
Pimenta S, Robinson P, 2014, Modelling the tensile response of unidirectional hybrid composites, 16th European Conference on Composite Materials
Pimenta S, Robinson P, 2014, Wavy-ply sandwich with composite skins and crushable core for ductility and energy absorption, Composite Structures, Vol: 116, Pages: 364-376, ISSN: 0263-8223
Conventional composite materials offer high specific stiffness and strength, but suffer from low failure strains and failure without warning. This work proposes a new design for sandwich structures with symmetrically-wavy composite skins and a crushable foam core, aiming to achieve large strains (due to unfolding of the skins) and energy absorption (due to crushing of the foam core) under tensile loading. The structure is designed by a combination of analytical modelling and finite element simulations, and the concept is demonstrated experimentally. When loaded under quasi-static tension, wavy-ply sandwich specimens with carbon–epoxy skins and optimised geometry exhibited an average failure strain of 8.6%, a specific energy dissipated of 9.4 kJ/kg, and ultimate strength of 1570 MPa. The scope for further developing the wavy-ply sandwich concept and potential applications requiring large deformations and energy absorption are discussed.
Pimenta S, Pinho ST, 2014, An analytical model for the translaminar fracture toughness of fibre composites with stochastic quasi-fractal fracture surfaces, Journal of the Mechanics and Physics of Solids, Vol: 66, Pages: 78-102, ISSN: 0022-5096
The translaminar fracture toughness of fibre-reinforced composites is a size-dependent property which governs the damage tolerance and failure of these materials. This paper presents the development, implementation and validation of an original analytical model to predict the tensile translaminar (fibre-dominated) toughness of composite plies and bundles, as well as the associated size effect. The model considers, as energy dissipation mechanisms, debonding and pull-out of bundles from quasi-fractal fracture surfaces; the corresponding lengths are stochastic variables predicted by the model, based on the respective bundle strength distributions and fracture mechanics. Parametric studies show that composites are toughened by stronger fibres with large strength variability, and intermediate values of interfacial toughness and friction. Predictions are validated against four different composite ply systems tested in the literature, proving the model’s ability to capture not only size effects, but also the influence of different fibres and resins.
Pimenta S, Pinho ST, 2014, The influence of micromechanical properties and reinforcement architecture on the mechanical response of recycled composites, COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, Vol: 56, Pages: 213-225, ISSN: 1359-835X
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- Citations: 19
Pimenta S, Robinson P, 2013, An analytical model for the mechanical response of discontinuous composites, 19th International Conference on Composite Materials
Ribeiro J, Lopes H, Pimenta S, et al., 2013, Displacement and strain full-field measurement at open hole composite specimen using the digital image correlation technique, 4th International Conference on Integrity, Reliability and Failure (IRF2013)
Pimenta S, Robinson P, Czel G, et al., 2013, Discontinuous-ply composites for enhanced ductility, CompTest 2013
Pinho ST, Pimenta S, 2013, Modelling the size-dependent mode I translaminar fracture toughness of unidirectional fibre-reinforced composites, CompTest 2013
Pimenta S, 2013, Toughness and strength of recycled composites and their virgin precursors
Pimenta S, Pinho ST, 2013, Carbon Fibres, Handbook of Recycling, Editors: Worrell, Reuter, Publisher: Elsevier, ISBN: 9780123964595
Pimenta S, Pinho ST, 2013, Hierarchical scaling law for the strength of composite fibre bundles, Journal of the Mechanics and Physics of Solids, Vol: 61, Pages: 1337-1356, ISSN: 0022-5096
This paper presents an analytical model for size effects on the longitudinal tensile strength of composite fibre bundles. The strength of individual fibres is modelled by a Weibull distribution, while the matrix (or fibre-matrix interface) is represented through a perfectly-plastic shear-lag model. A probabilistic analysis of the failure process in hierarchical bundles (bundles of bundles) is performed, so that a scaling law relating the strength distributions and characteristic lengths of consecutive bundle levels is derived. An efficient numerical scheme (based on asymptotic limits) is proposed, hence coupon-sized bundle strength distributions are obtained almost instantaneously. Parametric studies show that both fibre and matrix properties are critical for bundle strength; model predictions at different scales are validated against experimental results available in the literature.
Pimenta S, Pinho ST, 2012, The effect of recycling on the mechanical response of carbon fibres and their composites, COMPOSITE STRUCTURES, Vol: 94, Pages: 3669-3684, ISSN: 0263-8223
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- Citations: 78
Pinho ST, Pimenta S, 2012, The mechanical performance of discontinuous recycled composites, Global Outlook for Carbon Fibre 2012
Pimenta S, Pinho ST, 2012, The effect of recycling on the mechanical performance of carbon fibres and their composites, Global Outlook for Carbon Fibre 2012
Pinho ST, Pimenta S, 2012, Size effects on the strength and toughness of fibre-reinforced composites, 10th World Congress on Computational Mechanics
Pimenta S, Pinho ST, 2012, Hierarchical scaling laws for the strength and toughness of composites, 15th European Conference on Composite Materials
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