Publications
217 results found
Kwak M, Robinson P, Bismarck A, et al., 2011, Curing of composite materials using the recently developed Hephaistos Microwave, ICCM International Conferences on Composite Materials
Carbon-fibre reinforced epoxy prepreg laminates were cured using the VHM (Vötsch Hephaistos Microwave) microwave, which the manufacturer claims has tackled key issues associated with microwave processing of composites, such as nonhomogeneous microwave distribution, the difficulty of using metallic tooling and vacuum bagging in a microwave environment, and arcing, thus providing a very significant difference to other systems in the past. The different, and sometimes relatively inconclusive, results obtained in past work could be attributed to the different systems employed. The VHM system has allowed researchers to more accurately assess the real effects of microwave technology for processing polymer matrix composites (PMCs). The performance of the samples produced was evaluated using differential scanning calorimetry (DSC), optical microscopy and mechanical testing. The results have been compared to samples cured conventionally.
Gutkin R, Pinho ST, Robinson P, et al., 2011, A finite fracture mechanics formulation to predict fibre kinking and splitting in CFRP under combined longitudinal compression and in-plane shear, MECHANICS OF MATERIALS, Vol: 43, Pages: 730-739, ISSN: 0167-6636
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- Citations: 29
Pimenta S, Pinho ST, Robinson P, 2011, Micromechanics of recycled composites for material optimisation and eco-design, 18th International Conference on Composite Materials
Bui VQ, Iannucci L, Robinson P, et al., 2011, A coupled mixed-mode delamination model for laminated composites, JOURNAL OF COMPOSITE MATERIALS, Vol: 45, Pages: 1717-1729, ISSN: 0021-9983
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- Citations: 11
De Carvalho NV, Pinho ST, Robinson P, 2011, An experimental study of failure initiation and propagation in 2D woven composites under compression, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 71, Pages: 1316-1325, ISSN: 0266-3538
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- Citations: 64
Gutkin R, Laffan ML, Pinho ST, et al., 2011, Modelling the R-curve effect and its specimen-dependence, INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, Vol: 48, Pages: 1767-1777, ISSN: 0020-7683
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- Citations: 67
Vyas GM, Pinho ST, Robinson P, 2011, Constitutive modelling of fibre-reinforced composites with unidirectional plies using a plasticity-based approach, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 71, Pages: 1068-1074, ISSN: 0266-3538
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- Citations: 63
De Carvalho NV, Pinho ST, Robinson P, 2011, Reducing the domain in the mechanical analysis of periodic structures, with application to woven composites, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 71, Pages: 969-979, ISSN: 0266-3538
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- Citations: 42
Gutkin R, Green CJ, Vangrattanachai S, et al., 2011, On acoustic emission for failure investigation in CFRP: Pattern recognition and peak frequency analyses, MECHANICAL SYSTEMS AND SIGNAL PROCESSING, Vol: 25, Pages: 1393-1407, ISSN: 0888-3270
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- Citations: 386
Kiefer K, Robinson P, Pinho ST, 2011, Comparison of models for the simulation of fatigue-driven delamination using cohesive elements
In this pape,r two formulations for introducing fatigue damage into cohesive elements have been examined to determine their mesh sensitivity and numerical stability in mode I. A simple, non-FE model has been used to quickly assess a wide range of parameters associated with the fatigue degradation routines developed for cohesive elements. The model has been used to explore the sensitivity of two fatigue degradation strategies to changes in key parameters. For small element and cycle increments, both models predict the fatigue crack growth rate accurately for various applied loads where the Paris law is valid. However the models exhibit significant mesh sensitivities. The analysis has shown that in order to obtain a numerically stable algorithm, the models need to be improved.
Stocchi C, Robinson P, Pinho ST, 2011, A detailed finite element investigation of composite bolted joints with countersunk fasteners
This paper presents a very detailed FEM model of a single lap shear composite bolted joint, with countersunk fasteners, under static tensile load. Parametric studies have been performed to study the influence of clamping force, coefficient of friction and clearance on the joint behaviour. It has been found that the model is able to identify correctly the joint critical locations and that the joint behaviour can be divided in five stages, which are deeply influenced by the three studied parameters.
Teixeira RF, Pinho ST, Robinson P, 2011, Translaminar ply fracture toughness of advanced composites
The translaminar fracture toughness of fibre reinforced polymers (FRP) is important to characterise the failure resistance and response of notched composite structures. Compact Tension (CT) tests of UD 90° [(90 6/0)2/903]s, [(90/0) 8/90]s and [(906/-45/906/+45)/ 903]s laminates were conducted in order to investigate the crack development and measure the translaminar fracture toughnesses values for three plies of interest:90°,0° and ± 45° A quasi-isotropic layup with 90°,0° and ±45°plies was also investigated. Testing was monitored with digital image correlation (DIC). The test method and data reduction scheme are the result of extensive background work [1]. Failure sequence was analysed using optical micrography, SEM, C-Scan and X-ray.
Kwak M, Robinson P, Bismarck A, et al., 2011, Curing of composite materials using the recently developed Hephaistos Microwave
Carbon-fibre reinforced epoxy prepreg laminates were cured using the VHM (Vötsch Hephaistos Microwave) microwave, which the manufacturer claims has tackled key issues associated with microwave processing of composites, such as nonhomogeneous microwave distribution, the difficulty of using metallic tooling and vacuum bagging in a microwave environment, and arcing, thus providing a very significant difference to other systems in the past. The different, and sometimes relatively inconclusive, results obtained in past work could be attributed to the different systems employed. The VHM system has allowed researchers to more accurately assess the real effects of microwave technology for processing polymer matrix composites (PMCs). The performance of the samples produced was evaluated using differential scanning calorimetry (DSC), optical microscopy and mechanical testing. The results have been compared to samples cured conventionally.
Pimenta S, Pinho ST, Robinson P, et al., 2010, Mechanical analysis and toughening mechanisms of a multiphase recycled CFRP, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 70, Pages: 1713-1725, ISSN: 0266-3538
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- Citations: 38
Gutkin R, Pinho ST, Robinson P, et al., 2010, Micro-mechanical modelling of shear-driven fibre compressive failure and of fibre kinking for failure envelope generation in CFRP laminates, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 70, Pages: 1214-1222, ISSN: 0266-3538
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- Citations: 71
Gutkin R, Pinho ST, Robinson P, et al., 2010, On the transition from shear-driven fibre compressive failure to fibre kinking in notched CFRP laminates under longitudinal compression, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 70, Pages: 1223-1231, ISSN: 0266-3538
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- Citations: 99
Raimondo L, Iannucci L, Robinson P, 2010, Developments in Failure and Damage Modeling for UD, 2D, and 3D Composite Materials, European Congress on Advanced Materials and Processes (Euromat 2009), Publisher: WILEY-V C H VERLAG GMBH, Pages: 627-632, ISSN: 1438-1656
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- Citations: 1
Laffan MJ, Pinho ST, Robinson P, et al., 2010, Measurement of the in situ ply fracture toughness associated with mode I fibre tensile failure in FRP. Part I: Data reduction, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 70, Pages: 606-613, ISSN: 0266-3538
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- Citations: 100
Laffan MJ, Pinho ST, Robinson P, et al., 2010, Measurement of the in situ ply fracture toughness associated with mode I fibre tensile failure in FRP. Part II: Size and lay-up effects, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 70, Pages: 614-621, ISSN: 0266-3538
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- Citations: 83
Galvanetto U, Robinson P, Cerioni A, et al., 2009, A simple model for the evaluation of constitutive laws for the computer simulation of fatigue-driven delamination in composite materials, SDHM Structural Durability and Health Monitoring, Vol: 5, Pages: 161-189, ISSN: 1930-2983
This paper presents a simple mathematical model to investigate various formulations of interface elements which are used to simulate fatigue driven delamination in composite materials. To illustrate the effectiveness of the model it is used to evaluate the performance of several different static constitutive laws and damage definitions coupled with a particular fatigue degradation strategy. It is shown that the model can be used to readily assess the robustness and reliability of the different formulations by examining hundreds of thousands of sets of parameter values in a rational and efficient manner. Copyright © 2009 Tech Science Press.
Pinho ST, Robinson P, Schuecker C, et al., 2009, Pressure-dependent constitutive and failure model for laminated composites
This paper presents a non-linear, pressure-dependent, three dimensional constitutive law and associated failure criteria for laminated composites with UD plies. The failure criteria result from a physical model for each failure mode. In-situ strengths are used for matrix failure and fibre kinking. The model is validated against experimental data.
Gutkin R, Pinho ST, Robinson P, et al., 2009, Investigation of kink-band formation under biaxial stress state
This paper investigates longitudinal compressive failure. Two failure modes were observed experimentally for pure longitudinal compression: shear-driven fibre compressive failure and kink-band formation. In a micromechanical numerical study, failure envelopes for combined longitudinal compression and in-plane shear were predicted.
Laffan MJ, Pinho ST, Robinson P, et al., 2009, Fracture toughness measurement for mode i fibre tensile failure in FRP
The compact tension specimen was used to measure the fracture toughness of the fibre tensile failure mode, in UD plies. An optimal data reduction scheme was identified and used to investigate specimen geometrical and lay-up effects. It was demonstrated that is not simply a material property, but dependent upon specimen lay-up.
Carvalho NV, Pinho ST, Robinson P, 2009, Compressive failure of 2D woven composites
This paper presents experimental and numerical research on the compressive failure of orthogonal 2-D woven composites with different stacking emphasizing the role of the interlacing region of tows. Resulting optical micrographs demonstrate the influence of the support of adjacent layers on the sequence of events leading to failure of woven composites.
McCarroll CA, Robinson P, Pinho ST, et al., 2009, High rate fractue toughness test design for tensile fibre failure modes
The compact tension specimen has been investigated numerically for the measurement of Mode I fracture toughness associated with fibre tensile failure,GIc, at crack speeds of the order of 200 m/s. This paper develops a load-independent data reduction scheme for analysing such tests using the compressive strain measured at the back edge of the specimen.
Robinson P, 2009, A self-indicating mode I interlaminar toughness test
This paper reports on the development of a Mode I interlaminar test which has been designed to indicate the crack position on the load-displacement curve so avoiding the requirement to monitor the crack length during the test. Results of the self-indicating test show good agreement with the conventional Mode I test method.
Galvanetto U, Robinson P, Cerioni A, et al., 2009, Assessment of the performance of two formulations of interface elements for the simulation of fatigue induced delamination
Recently interface elements have been used in the simulation of fatigue induced crack propagation. This work presents a one degree of freedom mathematical model which can be used to assess systematically the performance of different interface element formulations in an efficient and rational way.
Gill AF, Robinson P, Pinho S, 2009, Effect of variation in fibre volume fraction on modes I and II delamination behaviour of 5HS woven composites manufactured by RTM, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 69, Pages: 2368-2375, ISSN: 0266-3538
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- Citations: 46
Pimenta S, Pinho ST, Robinson P, 2009, Experimental study on the mechanical performance of recycled CFRP, 17th International Conference on Composite Materials
The mechanical behaviour of a recycled CFRP (rCFRP), with fibres reclaimed by pyrolysis and manufactured via resin infusion of recycled-fibre mats, is studied. The mechanical properties are characterised, demonstrating that rCFRP can replace GFRP. The rCFRP failure modes in tension and compression are also investigated, at the microscopic scale.
Pimenta S, Gutkin R, Pinho ST, et al., 2009, A micromechanical model for kink-band formation: Part I - Experimental study and numerical modelling, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 69, Pages: 948-955, ISSN: 0266-3538
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- Citations: 121
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