The Experts below are selected from a list of 10290 Experts worldwide ranked by ideXlab platform
Michael R Wisnom - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation of high velocity oblique impact and residual tensile strength of carbon epoxy laminates
Composites Science and Technology, 2019Co-Authors: Ashwin R. Kristnama, Xiaodong Xu, D Nowell, Michael R WisnomAbstract:Abstract Composite components are required to be resilient against Foreign Object Damage (FOD) induced by localised high velocity impact events. Here an experimental investigation into high velocity oblique impacts and residual tensile strength of thin quasi-isotropic carbon/epoxy laminates is reported. Oblique (45°) impacts between 100 m/s and 350 m/s were carried out using 3 mm steel cubes on the edge and the centre of the laminates, mounted as a cantilever beam. Impact induced damage was characterised using X-ray Computed Tomography (CT) and the residual strength of impacted laminates was determined through quasi-static tensile tests. The residual strength shows a strong dependence on the impact damage size, characterised in terms of Fibre Fracture width and delamination area. Machined notches were then investigated and compared to impacted laminates in terms of residual strength.
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Experimental investigation of high velocity oblique impact and residual tensile strength of carbon/epoxy laminates
Composites Science and Technology, 2019Co-Authors: Ashwin R. Kristnama, Xiaodong Xu, D Nowell, Michael R WisnomAbstract:Abstract Composite components are required to be resilient against Foreign Object Damage (FOD) induced by localised high velocity impact events. Here an experimental investigation into high velocity oblique impacts and residual tensile strength of thin quasi-isotropic carbon/epoxy laminates is reported. Oblique (45°) impacts between 100 m/s and 350 m/s were carried out using 3 mm steel cubes on the edge and the centre of the laminates, mounted as a cantilever beam. Impact induced damage was characterised using X-ray Computed Tomography (CT) and the residual strength of impacted laminates was determined through quasi-static tensile tests. The residual strength shows a strong dependence on the impact damage size, characterised in terms of Fibre Fracture width and delamination area. Machined notches were then investigated and compared to impacted laminates in terms of residual strength.
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detection of Fibre Fracture and ply fragmentation in thin ply ud carbon glass hybrid laminates using acoustic emission
Composites Part A-applied Science and Manufacturing, 2016Co-Authors: Putu Suwarta, Mohamad Fotouhi, Meisam Jalalvand, Gergely Czel, Michael R WisnomAbstract:This paper investigates the link between acoustic emission (AE) events and the corresponding damage modes in thin-ply UD carbon/glass hybrid laminates under tensile loading. A novel configuration was investigated which has not previously been studied by AE, where the laminates were fabricated by embedding thin carbon plies between standard thickness translucent glass plies to produce progressive fragmentation of the carbon layer and delamination of the carbon/glass interface. A criterion based on amplitude and energy of the AE event values was established to identify the fragmentation failure mode. Since the glass layer was translucent, it was possible to quantitatively correlate the observed fragmentation during the tests and the AE events with high amplitude and energy values. This new method can be used as a simple and advanced tool to identify Fibre Fracture as well as estimate the number and sequence of damage events that are not visible e.g. in hybrid laminates with thick or non-transparent layers as well as when the damage is too small to be visually detected.
Mohamad Fotouhi - One of the best experts on this subject based on the ideXlab platform.
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detection of Fibre Fracture and ply fragmentation in thin ply ud carbon glass hybrid laminates using acoustic emission
Composites Part A-applied Science and Manufacturing, 2016Co-Authors: Putu Suwarta, Mohamad Fotouhi, Meisam Jalalvand, Gergely Czel, Michael R WisnomAbstract:This paper investigates the link between acoustic emission (AE) events and the corresponding damage modes in thin-ply UD carbon/glass hybrid laminates under tensile loading. A novel configuration was investigated which has not previously been studied by AE, where the laminates were fabricated by embedding thin carbon plies between standard thickness translucent glass plies to produce progressive fragmentation of the carbon layer and delamination of the carbon/glass interface. A criterion based on amplitude and energy of the AE event values was established to identify the fragmentation failure mode. Since the glass layer was translucent, it was possible to quantitatively correlate the observed fragmentation during the tests and the AE events with high amplitude and energy values. This new method can be used as a simple and advanced tool to identify Fibre Fracture as well as estimate the number and sequence of damage events that are not visible e.g. in hybrid laminates with thick or non-transparent layers as well as when the damage is too small to be visually detected.
Gergely Czel - One of the best experts on this subject based on the ideXlab platform.
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detection of Fibre Fracture and ply fragmentation in thin ply ud carbon glass hybrid laminates using acoustic emission
Composites Part A-applied Science and Manufacturing, 2016Co-Authors: Putu Suwarta, Mohamad Fotouhi, Meisam Jalalvand, Gergely Czel, Michael R WisnomAbstract:This paper investigates the link between acoustic emission (AE) events and the corresponding damage modes in thin-ply UD carbon/glass hybrid laminates under tensile loading. A novel configuration was investigated which has not previously been studied by AE, where the laminates were fabricated by embedding thin carbon plies between standard thickness translucent glass plies to produce progressive fragmentation of the carbon layer and delamination of the carbon/glass interface. A criterion based on amplitude and energy of the AE event values was established to identify the fragmentation failure mode. Since the glass layer was translucent, it was possible to quantitatively correlate the observed fragmentation during the tests and the AE events with high amplitude and energy values. This new method can be used as a simple and advanced tool to identify Fibre Fracture as well as estimate the number and sequence of damage events that are not visible e.g. in hybrid laminates with thick or non-transparent layers as well as when the damage is too small to be visually detected.
Cwm Cees Bastiaansen - One of the best experts on this subject based on the ideXlab platform.
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tensile strength of solution spun ultra drawn ultra high molecular weight polyethylene Fibres 1 influence of Fibre diameter
Polymer, 1992Co-Authors: Cwm Cees BastiaansenAbstract:Abstract The influence of Fibre diameter on the tensile strength of solution-spun, ultra-drawn, ultra-high molecular weight polyethylene (UHMW-PE, M w > 10 3 kg mol −1 ) Fibres was investigated. Fibres with a wide range of diameters were produced by varying the polymer concentration in solution and by applying a drawdown to the Fibres. The tensile strength of drawn Fibres is compared at a constant Young's modulus in order to eliminate the influence of morphological parameters, such as degree of chain orientation and extension, on the Fracture behaviour. It is shown that the tensile strength of UHMW-PE Fibres is independent of the Fibre diameter. In accordance with previous studies, it is found that Fibre Fracture is initiated by molecular events, such as chain scission.
C R Cheesema - One of the best experts on this subject based on the ideXlab platform.
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new sustainable materials from waste feathers properties of hot pressed feather cotton bi component Fibre boards
Sustainable Materials and Technologies, 2019Co-Authors: Elena Dieckma, Kosta Eleftheriou, Thibaul Audic, Koonyang Lee, Leila Sheldrick, C R CheesemaAbstract:Abstract Feathers from poultry are an abundant, globally available waste. The current beneficial reuse for feathers involves autoclaving them to produce feather meal, an animal feed with low economic value. This paper reports on the production and performance of new feather-derived materials. These have potential to provide a higher value application for waste feathers. Feather Fibres, cotton Fibres and polyethylene/polypropylene bi-component Fibres (blended 55:20:25 by weight) have been air-laid to form 20 mm thick non-woven pre-forms with a density of 0.14 g cm−2. These were then hot pressed to produce materials with significantly higher density and improved properties. Optimum materials were formed by hot pressing between 150 and 160 °C at 6 MPa for 1 min. Lower temperatures resulted in poor Fibre bonding and Fibre pull-out during Fracture. Higher temperatures caused thermal degradation of the feather Fibres. The optimum feather Fibre boards with a density of 0.77 g/cm3, corresponding to 31.3% porosity, had tensile strengths of 17.9 MPa a tensile modulus of 1.74 GPa and an elongation at Fracture of 5.9%. These samples exhibited Fibre Fracture during tensile testing. Feather Fibre boards have similar tensile strength, density and Young's modulus to particleboard, organic resin particleboard and flake board. Quantitative estimates of the economic and environmental benefits from using feather Fibres to form feather Fibre boards are discussed. The research advances sustainability by providing a new potential circular economy outlet for waste feathers and is part of on-going research to develop novel applications that exploit the unique properties of feathers.