Publications
269 results found
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.
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.
Escárpita A, Elizalde H, Ramírez RA, et al., 2009, Modified cruciform specimen for biaxial testing of fibre-reinforced composites
This work introduces an enhanced cruciform specimen optimized for the mechanical characterization of fibre-reinforced composite materials subjected to a biaxial stress state (e.g. orthogonal loads). The tension-tension case, for which there is scarce published data, is specifically analyzed. First, different cruciform specimens reported in literature are modelled via finite elements to determine their stress distribution. Based on these results, as well as in existing standards and guidelines for uniaxial mechanical testing in metals and composites, an enhanced design is developed, aimed to ensure that the deformation field in its central region remains truly biaxial, thus increasing the reliability of yielded data. Future work will cover an extensive experimental program to validate this design, although early results using full-deformation strain field measurements are encouraging.
Melro AR, Camanho PP, Pinho ST, 2008, Generation of random distribution of fibres in long-fibre reinforced composites, COMPOSITES SCIENCE AND TECHNOLOGY, Vol: 68, Pages: 2092-2102, ISSN: 0266-3538
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- Citations: 236
Raimondo L, Iannucci L, Robinson P, et al., 2008, A Numerical Material Model for Predicting the High Velocity Impact Behaviour of Polymer Composites, 1st ECCOMAS Thematic Conference on Mechanical Response of Composites, Publisher: SPRINGER-VERLAG BERLIN, Pages: 161-177
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- Citations: 8
Pinho ST, Camanho PP, 2007, A smeared crack model for simulating damage in laminated composites
This paper presents a new three-dimensional damage propagation model for laminated composites. The initiation of failure is predicted using a state-of-the-art physically-based set of criteria, LaRC04. The novelty in this work lies in the modelling of failure propagation. So that the propagation of cracks with any orientation in a 3D space (as predicted by LaRC04) can be more accurately modelled, the strains are divided into their crack and elastic components. Mesh dependency is addressed using a smeared crack formulation with a characteristic length parameter. The model is implemented in the commercial software ABAQUS Explicit, so it can be readily used by designers and engineers. Validation and application examples will be presented at the conference.
Raimondo L, Iannucci L, Robinson P, et al., 2007, Predicting the dynamic behaviour of polymer composites
This paper describes experimental and numerical research activities aimed at the development, implementation into an explicit FE code, and validation of a state-of-the-art composite material model for dynamic failure. The developed material model, which can predict the behaviour of UD Carbon Fibre Reinforced Polymer (CFRP) composites, is implemented into LS-DYNA3D for solid brick elements with one integration point. Though the developed model has wide applicability, this paper focuses on aspects related to validation against composites ballistic data.
Melro AR, Camanho PP, Pinho ST, 2007, Generation of transversal material randomness in fibre reinforced composites
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- Citations: 1
Gill AF, Robinson P, Pinho S, et al., 2007, Effect of RTM defects on mode I & II delamination behaviour of 5HS woven composites
Composites produced by resin infusion techniques will inevitably suffer from variation in resin distribution due to imprecise fibre placement and distortion of the preform during mould closure and infusion. This paper describes an investigation into the effect of variations in fibre volume fraction (FVF) on mode I and mode II delamination behaviour for 5 harness satin (5HS) woven carbon-fibre/epoxy resin composites manufactured by resin transfer moulding (RTM). Additionally, the effect of satin face tow orientation on interlaminar toughness was investigated.
Dogra J, Hodgkinson JM, Robinson P, et al., 2007, Development of a compression test for thick composite laminates: finite element analysis, 16th International Conference on Composite Materials
Moreira PMGP, De Matos PFP, Pinho ST, et al., 2007, The residual stress intensity factors for cold-worked cracked holes: a technical note. (vol 27, pg 879, 2004), FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, Vol: 30, Pages: 170-170, ISSN: 8756-758X
Pinho ST, Camanho PP, 2007, A smeared crack model for simulating damage in laminated composites
This paper presents a new three-dimensional damage propagation model for laminated composites. The initiation of failure is predicted using a state-of-the-art physically-based set of criteria, LaRC04. The novelty in this work lies in the modelling of failure propagation. So that the propagation of cracks with any orientation in a 3D space (as predicted by LaRC04) can be more accurately modelled, the strains are divided into their crack and elastic components. Mesh dependency is addressed using a smeared crack formulation with a characteristic length parameter. The model is implemented in the commercial software ABAQUS Explicit, so it can be readily used by designers and engineers. Validation and application examples will be presented at the conference.
Gill AF, Robinson P, Pinho S, et al., 2007, Effect of RTM defects on mode I & II delamination behaviour of 5HS woven composites
Composites produced by resin infusion techniques will inevitably suffer from variation in resin distribution due to imprecise fibre placement and distortion of the preform during mould closure and infusion. This paper describes an investigation into the effect of variations in fibre volume fraction (FVF) on mode I and mode II delamination behaviour for 5 harness satin (5HS) woven carbon-fibre/epoxy resin composites manufactured by resin transfer moulding (RTM). Additionally, the effect of satin face tow orientation on interlaminar toughness was investigated.
Raimondo L, Iannucci L, Robinson P, et al., 2007, Predicting the dynamic behaviour of polymer composites
This paper describes experimental and numerical research activities aimed at the development, implementation into an explicit FE code, and validation of a state-of-the-art composite material model for dynamic failure. The developed material model, which can predict the behaviour of UD Carbon Fibre Reinforced Polymer (CFRP) composites, is implemented into LS-DYNA3D for solid brick elements with one integration point. Though the developed model has wide applicability, this paper focuses on aspects related to validation against composites ballistic data.
Dogra J, Hodgkinson JM, Robinson P, et al., 2007, Development of a compression test for thick composite laminates: Finite element analysis
Finite element stress analyses have been made for composite laminates loaded in compression with a thickness of 2 mm and 10 mm, where the main parts of the fixture have also been modelled. Different designs have been investigated and the results are compared with a 2 mm thick specimen. Results for a reverse chamfer design and width waisted design for two different profiles are presented for a 10 mm thick specimen. A width waisted design has shown to significantly reduce stress concentrations in the fibre direction. A profile defined by a cubic equation offers the most promising results. The effect of including a model of the fixture grip in the transverse fibre direction on the specimen stress distribution is also considered for a 10 mm thick specimen. This has shown to increase the longitudinal stress concentrations in the specimen.
Pinho ST, Iannucci L, Robinson P, 2006, Formulation and implementation of decohesion elements in an explicit finite element code, COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, Vol: 37, Pages: 778-789, ISSN: 1359-835X
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- Citations: 120
Camanho PP, Dávila CG, Pinho ST, et al., 2006, Prediction of in situ strengths and matrix cracking in composites under transverse tension and in-plane shear, 2nd International Conference on Composites Testing and Model Identification (CompTest 200), Publisher: ELSEVIER SCI LTD, Pages: 165-176, ISSN: 1359-835X
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- Citations: 285
Pinho ST, Robinson P, Iannucci L, 2006, Fracture toughness of the tensile and compressive fibre failure modes in laminated composites, Composites Science and Technology, Vol: 66, Pages: 2069-2079, ISSN: 0266-3538
Pinho ST, Iannucci L, Robinson P, 2006, Physically-based failure models and criteria for laminated fibre-reinforced composites with emphasis on fibre-kinking. Part II: FE implementation, Composites: Part A, Vol: 37, Pages: 766-777, ISSN: 1359-835X
Pinho ST, Martins HB, Camanho PP, et al., 2005, Residual stress field and reduction of stress intensity factors in cold-worked holes, THEORETICAL AND APPLIED FRACTURE MECHANICS, Vol: 44, Pages: 168-177, ISSN: 0167-8442
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- Citations: 16
Pinho ST, Davila CG, Camanho PP, et al., 2005, Failure models and criteria for FRP under in-plane or three-dimensional stress states including shear non-linearity, Technical Memorandum, Langley, Publisher: National Aeronautics and Space Administration, Langley Research Center, NASA/TM-2005-213530
Pinho ST, Iannucci L, Robinson P, 2005, Modelling failure using physically-based 3D models and a Smeared formulation, Durban, 15th International Conference on Composite Materials, Publisher: Centre for Composite and Smart Materials and Structures, University of KwaZulu-Natal, Pages: 473-474
Camanho PP, Dávila CG, Pinho ST, 2004, Fracture analysis of composite co-cured structural joints using decohesion elements, FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, Vol: 27, Pages: 745-757, ISSN: 8756-758X
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- Citations: 56
Moreira PMGP, De Matos PFP, Pinho ST, et al., 2004, The residual stress intensity factors for cold-worked cracked holes: a technical note, FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, Vol: 27, Pages: 879-886, ISSN: 8756-758X
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- Citations: 16
Pinho ST, Camanho PP, de Moura MF, 2004, Numerical simulation of the crushing process of composite materials, INTERNATIONAL JOURNAL OF CRASHWORTHINESS, Vol: 9, Pages: 263-276, ISSN: 1358-8265
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- Citations: 50
Pinho S, Iannucci L, Robinson P, 2004, Modelling delamination in an explicit FE code using 3D decohesion elements, Composites testing and model identification, COMPTEST, University of Bristol, U.K, Pages: 171-172
Vieira P, Pinho ST, Marques AT, et al., 2004, Manufacture of a fin-box made by RTM, 2nd International Materials Symposium, Publisher: TRANS TECH PUBLICATIONS LTD, Pages: 890-894, ISSN: 0255-5476
Pinho ST, Novo C, Nicolau A, et al., 2002, Permeability tests of carbon fibre preforms, 1st International Materials Symposium (Materials 2001), Publisher: TRANS TECH PUBLICATIONS LTD, Pages: 331-334, ISSN: 1013-9826
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