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Letteratura scientifica selezionata sul tema "Finite element modelling"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 7 luglio 2024

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Articoli di riviste sul tema "Finite element modelling"

Kumar, Anil, Anil kumar chhotu, Ghausul Azam Ansari, Md Arman Ali, Abhishek kumar, Rajk ishor e Ashutosh kumar. "Finite Element Modelling of Corroded RC Flexural Elements". International Journal of Engineering Trends and Technology 71, n. 4 (25 aprile 2023): 462–73. http://dx.doi.org/10.14445/22315381/ijett-v71i4p239.

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Merodo, José Antonio Fernandez, e Manuel Pastor. "Finite Element Modelling of Landslides". Revue Française de Génie Civil 6, n. 6 (gennaio 2002): 1193–212. http://dx.doi.org/10.1080/12795119.2002.9692739.

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Ridley, P. H. W., G. W. Roberts, M. A. Wongsam e R. W. Chantrell. "Finite element modelling of nanoelements". Journal of Magnetism and Magnetic Materials 193, n. 1-3 (marzo 1999): 423–26. http://dx.doi.org/10.1016/s0304-8853(98)00467-3.

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Shinwari, M. W., M. J. Deen e P. R. Selvaganapathy. "Finite-Element Modelling of Biotransistors". Nanoscale Research Letters 5, n. 3 (19 gennaio 2010): 494–500. http://dx.doi.org/10.1007/s11671-009-9522-4.

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Carey, Graham F. "Parallelism in finite element modelling". Communications in Applied Numerical Methods 2, n. 3 (maggio 1986): 281–87. http://dx.doi.org/10.1002/cnm.1630020309.

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Fernández Ruiz, M., G. Argirova e A. Muttoni. "How simple can nonlinear finite element modelling be for structural concrete?" Informes de la Construcción 66, Extra-1 (30 dicembre 2014): m013. http://dx.doi.org/10.3989/ic.13.085.

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Kukiełka, Leon, e Krzysztof Kukiełka. "Modelling and analysis of the technological processes using finite element method". Mechanik, n. 3 (marzo 2015): 195/317–195/340. http://dx.doi.org/10.17814/mechanik.2015.3.149.

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Kushwaha, R. L. "FINITE ELEMENT MODELLING OF TILLAGE TOOL DESIGN". Transactions of the Canadian Society for Mechanical Engineering 17, n. 2 (giugno 1993): 257–69. http://dx.doi.org/10.1139/tcsme-1993-0016.

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A non-linear finite element model was developed for three dimensional soil cutting by tillage tools. A hyperbolic constitutive relation for soil was used in the model. Analysis was carried out to simulate soil cutting with rectangular flat and triangular tillage blades at different rake angles and with curved blades. Interface elements were used to model the adhesion and the friction between soil and blade surface. Soil forces obtained from the finite element model for the straight blades were verified with the results from laboratory tillage tests in the soil bin. The finite element model predicted draft force accurately for both tillage tools. Results indicated that the draft was a function of rake angle, tool shape and the curvature.

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Moskvichev, Egor. "Distribution of material properties in finite element models of inhomogeneous elements of structures". EPJ Web of Conferences 221 (2019): 01034. http://dx.doi.org/10.1051/epjconf/201922101034.

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This paper discusses an approach to finite element modelling of structure elements considering material inhomogeneity. This approach is based on the functional dependence of mechanical properties on the spatial coordinates of finite elements. It allows modelling gradient transitions between different materials, which avoid stress discontinuities during strength analysis. The finite element models of cold formed angle, welded joint and thermal barrier coating, created by this method, have been presented.

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Chia, Julian Y. H., Kais Hbaieb e Q. X. Wang. "Finite Element Modelling Epoxy/Clay Nanocomposites". Key Engineering Materials 334-335 (marzo 2007): 785–88. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.785.

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A full 3D finite element method has been used to understand how nano-clay particles affect the mechanical properties of an epoxy/clay nanocomposite. The epoxy/clay nanocomposite has been modelled as a representative volume element (RVE) containing intercalated clay platelets that internally delaminates at the gallery layer upon satisfying an energy criterion, and an epoxy matrix that is elastic-plastic. A cohesive traction-displacement law is used to model the clay gallery behaviour until failure. For clay volume fractions >1%, clay particle interaction is observed to develop during uniaxial tension, the nanocomposite stiffness becomes non-linearly dependent on the clay volume fraction, and the Mori-Tanaka model overestimates the stiffness. Failure of the clay gallery is not observed and is believed to have no influence on the ultimate tensile strength of the nanocomposite.

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Tesi sul tema "Finite element modelling"

Roberts, D. P. "Finite element modelling of rockbolts and reinforcing elements". Thesis, Swansea University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638679.

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The aim of this research was to produce a generic rockbolt model for inclusion in two and three dimensional explicit finite element analyses of mining problems. Installation of rockbolts is completely automated. Algorithms for the automatic placement of rockbolt nodes within continuum elements are developed and described. The rockbolts are described independently of the continuum degrees of freedom. Continuum elements and the rockbolt elements are connected through bond elements. Displacements from the continuum are transferred to the rockbolt system through these elements, and the resultant reactions passed to the continuum as external loads. In this way, the solution procedures for the continuum and the rockbolts are separated, thus creating an explicit-explicit subcycle. Using this form or nodal partitioning, rockbolts may have much higher stiffness than the parent continuum without effecting the overall timestep for the problem. Rockbolt systems are constructed of interconnected layers of bond elements and axial structural elements. The constitutive models for both these types of elements are effectively one-dimensional and therefore may be expressed algebraically. The most appropriate bond models from the literature are discussed and implemented. In addition, there is the capacity for elements crossing discontinuities to generate reactions consistent with transverse shearing of rockbolts. The model is tested by performing numerical pull-tests, based on experimental data from the literature. The sensitivity of rockbolt system to the relative bond and axial stiffness is demonstrated. The numerical axial and bond stress distributions were consistent with the experimental results. The model is applied to an excavation problem, with various rockbolt types and support patterns being analysed. The capacity of rockbolts to reduce the occurrence and depth of fracturing around the excavation is demonstrated. The model is also used to represent reinforcing bars in a concrete beam.

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Kolstad, Gaute Thorson. "Finite Element Modelling of Weldments". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for produktutvikling og materialer, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19322.

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Brittle fracture is a large problem for steel structures in the arctic region. It is thus important to qualify materials and welds so they do not behave in a brittle manner. Since fracture testing of the heat affected zone (HAZ) around a weld gives a lot of scatter, doing weld simulated testing is proposed as an alternative method. In this thesis cracks in weld simulated HAZ specimens are compared to cracks in real welds, by use of finite element simulations. A weld simulated specimen is usually more brittle than a real weld. The goal of this thesis is thus to find a general rule for how much more brittle a weld simulated test specimen is, compared to a real weld on a structure. It would then be possible to establish how brittle a real weld is based on the result from the weld simulated testing. As a fracture criterion the Weibull stress is used, which is a statistical criterion. Crack tip opening displacement (CTOD) is used as a measure on how brittle a specimen is. To compare weld simulated specimens with real welds, two 2D modified boundary layer (MBL) models are used. One homogeneous model to represent weld simulated specimens, and one with three different materials to represent a real weld. The three materials in the weld model are base material, welded material and heat affected zone. On the two models a large parameter study is performed. The variables investigated are: - Position of the crack relative to the HAZ. - Size of the HAZ. - Geometry constraint. - Mismatch in WM. - Mismatch in HAZ. - Hardening. - The Weibull exponent m. There have also been made 3D models to investigate the size effect on the weld simulated specimen. This is because a weld simulated specimen is limited to a cross-section of $10$x$10$~mm. The parameter study concludes that it is mainly the size of the HAZ, the yield stress mismatch and the geometry constraint, that make weld simulated specimens more brittle than welds. The 3D simulations are however concluding that the geometry constraint effect can not be included, due to the size of the small test specimen. Based on these results a general relationship is proposed between the critical CTOD for a weld simulated specimen, and the critical CTOD for a real weld. There are three requirements for this relationship to be valid: - At least 10% overmatch in HAZ compared to base material. - No more than 10% undermatch in HAZ compared to welded material. - Maximal brittle HAZ thickness of 0.5 mm.

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Pires, F. M. A. "Issues on the finite element modelling". Thesis, Swansea University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638539.

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Aspects of constitutive modelling and numerical prediction of failure in finitely straining ductile metals are investigated in this thesis. Attention is focused on the construction of a framework for prediction of failure. The development of a model for finite strain elasto-(visco)plastic damage; a low order finite element for the numerical treatment of incompressibility and an adaptive mesh refinement strategy for this class of problems, constitute the building blocks of the overall approach. Emphasis is given to the efficient numerical simulation of the proposed theories in large scale problems. The characterisation of material response has to account for the interaction between the different phenomena that precede fracture initiation. The derivation of constitutive models is addressed within Continuum Damage Mechanics theory. Particular, the effect of micro-crack closure which may dramatically decrease the rate of damage growth under compression is emphasised. With regard to the computational treatment of incompressibility, a new technique which allows the use of simplex finite elements in the large strain analysis of nearly incompressible solids is proposed. It is based on relaxation of the excessive volumetric constrain by the enforcement of near-incompressibility over a patch of elements. The new elements are implemented within an implicit quasi-static and an explicit transient dynamic finite element environment. The algorithms for numerical integration of the corresponding path dependent constitutive equations are discussed in detail. The strategy for numerical simulation of the associated incremental boundary value problems relies on fully implicit and explicit displacement based finite element procedures.

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Bayrakdar, Haluk. "Finite element modelling of transportation tunnels". Thesis, Durham University, 1995. http://etheses.dur.ac.uk/5175/.

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The aim of this thesis is to determine the ground deformation and stress distribution around highway tunnels at various stages of excavation and for several support conditions using finite element modelling techniques. When ground is excavated and material removed the subsequent redistribution of stress in the remaining surrounding material needs to be treated by one of three methods. These are the gravity difference method, the stress reversal technique and the relaxation approach. The first two methods were chosen for the simulation of excavation in this study. The tunnel data are in the form of the dimensions of the tunnel, heights of the rock layers, details of the shotcrete lining and tunnel support systems. A pre-processing program was written to transform this information into a finite element mesh in a format suitable for use by PAFEC-FE software. This enables different tunnel models and meshes to be produced with minimum error and time. The lack of adequate post-processing facilities available in PAFEC-FE dictated that computer programs needed to be written in order to reformat the textual output files and process the mesh stress and displacement outputs for graphical display using UNIRAS. In this way repeated use could be made of PAFEC-FE without time-consuming and error-prone manual retrieval of data. The tunnels were modelled at various stages of excavation and with such support provided at those stages as to allow the computed displacements to be compared with measurements made on highway tunnels in Turkey. The stresses generated in the tunnel supports and surrounding ground were also calculated to enable the possibility of damage or failure of the support structure or ground to be assessed and the selection of an optimal support system. Insertion of a support system into the model has a marginal effect on the development of rock strength around an excavation boundary.

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Knock, Clare. "Finite element modelling of estuarine hydrodynamics". Thesis, University of the West of England, Bristol, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258716.

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Datta, Kanyakumari. "Finite element modelling of hot rolling". Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242200.

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Adam, Alexandros. "Finite element, adaptive spectral wave modelling". Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/45307.

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The ability to predict the wave climate has a great impact on a wide range of sectors, including coastal and offshore engineering, marine renewable energy and shipping. The state of the art in wave prediction is called spectral wave modelling and is based on a phase-averaged, spectral description of the sea-surface elevation. The governing equation, called the action balance equation, is five-dimensional and describes the generation, propagation and evolution of action density in geographic space, spectral space and time. Due to the multidimensional nature of the equation the feasible resolutions are restricted by the computational costs. The aim of this work is to propose schemes which can increase the range of possible resolutions in spectral wave modelling, with the use of adaptivity in space and angle. Thus, this work focuses on the development of an unstructured, adaptive finite element spectral wave model (Fluidity-SW). A sub-grid scale model for the spatial discretisation is used, which retains the stability of discontinuous systems, with continuous degrees of freedom. Then, a new framework for angular adaptivity is developed, with results in dynamic angular and spatial anisotropy of the angular mesh. Finally a spatially h−adaptive scheme is implemented, which can dynamically treat the spatial gradients of the solution fields. The resulting framework is thoroughly verified and validated in a wide range of test cases and realistic scenarios, against analytical solutions, wave measurements and the results obtained with the widely used SWAN model. Thus, the overall ability of the code to simulate surface gravity wind-waves in fixed and adaptive spatial and angular meshes is demonstrated.

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Bates, Paul David. "Finite element modelling of floodplain inundation". Thesis, University of Bristol, 1992. http://hdl.handle.net/1983/edf8eb51-e701-4c18-a482-7f0dac785f84.

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Flood inundation phenomena typically occur over reach lengths of 5- 30 km and incorporate a number of complex flow mechanisms. These include a momentum transfer between the main channel and floodplain and turbulent mixing caused by the delivery of water to the floodplain from the channela nd its subsequenrte turn. However, currently available one dimensional schemes applicable at scales appropriate to floodplain inundation processes cannot effectively simulate such processes. This is due to both an incomplete description of the flow physics and a failure to treat floodplain areas in realistic fashion. More complex two and three dimensional models, which have these capabilities, have only been applied over very short reach lengths (c. 0.5 -2 km) and rarely to compound meandering channels. This thesis reports on the further development of a generalized two dimensional, finite element code (RMA-2) to meet this research need. This is achieved via a series of modifications to the numerical model and to the physical representation by finite elements that enable river channel/floodplain flow at the long reach scale to be effectively simulated. Evaluationo f the enhancedR MA-2 schemef ollows a three stages trategy. Firstly, the assumptions underlying the scheme are examined to identify possible inconsistencies. Secondly, tests are undertaken to assess whether the specified physical model has been correctly transferred into computer code. This is achieved via sensitivity analysis, examination of numerical stability issues and investigation of model response to abnormal parameterization. Thirdly, model predictions of flow field information are compared to observed field data in the context of an application of the enhanced model to an 11 km reach of the River Culm, Devon, UK. Results from this evaluation process indicate that the enhanced RMA-2 model is capable of simulating main channel/floodplain momentum transfer and the two dimensionale ffects associatedw ith compoundm eanderingc hannelsa t this scale. Model simulations compare favourably to field data, both for specific cross sections and over the entire mesh. Finally, extension of this core modelling capability is begun via the development of two model application scenarios. These demonstrate the likely utility of the enhanceds chemef or the assessmenotf flood risk and the investigationo f sediment depositionp rocessesin floodplain systems.

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Swarbrick, Sean James. "Finite element simulation of viscoelastic flow". Thesis, Teesside University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278423.

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Kukula, S. J. "Finite element modelling of delaminations in composites". Thesis, Imperial College London, 1993. http://hdl.handle.net/10044/1/7711.

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Libri sul tema "Finite element modelling"

Wolf, John P. Finite-element modelling of unbounded media. Chichester, England: Wiley, 1996.

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Quigley, Steven Francis. Finite element modelling of semiconductor devices. Birmingham: University of Birmingham, 1988.

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Multiphysics modelling with finite element methods. New Jersey: London, 2006.

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Habchi, Wassim. Finite Element Modelling of Elastohydrodynamic Lubrication Problems. Chichester, UK: John Wiley & Sons Ltd, 2018. http://dx.doi.org/10.1002/9781119225133.

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Mohammed, E. M. A. Finite element modelling of PVDF ultrasonic transducers. Manchester: UMIST, 1996.

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Burt, David J. Finite element modelling of 20 magnetic systems. Salford: University of Salford, 1992.

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Stredulinsky, David C. Finite element modelling of helical compression springs. Dartmouth, N.S: Defence Research Establishment Atlantic, 1992.

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Topping, B. H. V. Parallel finite element computations. Edinburgh: Saxe-Coburg Publications, 1996.

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Morris, A. J. A practical guide to reliable finite element modelling. Hoboken, N.J: Wiley, 2007.

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Morris, A. J. A practical guide to reliable finite element modelling. Chichester, England: John Wiley & Sons, 2008.

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Capitoli di libri sul tema "Finite element modelling"

Friswell, M. I., e J. E. Mottershead. "Finite Element Modelling". In Finite Element Model Updating in Structural Dynamics, 7–35. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8508-8_2.

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Ishak, Muhammad Ikman, e Mohammed Rafiq Abdul Kadir. "Finite Element Modelling". In Biomechanics in Dentistry: Evaluation of Different Surgical Approaches to Treat Atrophic Maxilla Patients, 37–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-32603-5_4.

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Hill, Geoff. "Finite Element Analysis". In Loudspeaker Modelling and Design, 25–27. New York, NY: Routledge, [2019]: Routledge, 2018. http://dx.doi.org/10.4324/9781351116428-8.

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Poletkin, Kirill. "Quasi-finite Element Modelling". In Microsystems and Nanosystems, 45–58. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-58908-0_4.

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Demir, Teyfik, e Cemile Başgül. "Finite Element Modelling Studies". In The Pullout Performance of Pedicle Screws, 77–79. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16601-8_7.

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Hill, Geoff. "Mechanical Finite Element Analysis". In Loudspeaker Modelling and Design, 101–6. New York, NY: Routledge, [2019]: Routledge, 2018. http://dx.doi.org/10.4324/9781351116428-26.

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Mobbs, Stephen D. "Numerical Techniques — The Finite Element Method". In Semiconductor Device Modelling, 49–59. London: Springer London, 1989. http://dx.doi.org/10.1007/978-1-4471-1033-0_4.

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Petyt, M. "Finite Element Modelling in Structural Dynamics". In Industrial Vibration Modelling, 135–47. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-4480-0_9.

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Benedini, Marcello, e George Tsakiris. "The Finite Element Method". In Water Quality Modelling for Rivers and Streams, 149–78. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5509-3_13.

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Stangle, Gregory C. "Numerical solution: Some finite element methods". In Modelling of Materials Processing, 499–559. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5813-2_15.

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Atti di convegni sul tema "Finite element modelling"

BRIND, RJ. "FINITE ELEMENT MODELLING OF THE A.R.E. LOW FREQUENCY FLEXTENSIONAL TRANSDUCER". In Finite Elements Applied to Sonar Transducers 1988. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/22099.

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Zhelyazov, Todor. "Finite Element Modelling of FRP – Strengthened Structural Elements". In IABSE Symposium, Guimarães 2019: Towards a Resilient Built Environment Risk and Asset Management. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/guimaraes.2019.0752.

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Numerical aspects of the analysis of structural elements strengthened with FRP reinforcement are discussed in this contribution. Constitutive laws are defined on the meso – scale for the materials involved (steel, concrete, FRP).The evolutions of experimentally observable parameters of FRP-strengthened concrete elements loaded in flexure are obtained by finite element analysis. Numerical results are compared to experimental data.The employed numerical strategy consists in defining a damage-based constitutive law for concrete. A beneficial outcome of the implementation of such constitutive relation is the possibility to monitor the damage evolution for a given period of exploitation. Since the remaining structural life can be assessed in this way, monitoring of damage accumulation appears as a prerequisite for an accurate and efficient design of the reinforcement.

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Tanta, Ovidiu Magdin, Elena Daniela Olariu, Mihaela Poienar e Dan Laurentiu Milici. "CEUS figures finite element modelling". In 2016 International Conference and Exposition on Electrical and Power Engineering (EPE). IEEE, 2016. http://dx.doi.org/10.1109/icepe.2016.7781326.

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Kumaran, Santosh, Michael J. Quinn e Robert N. Miller. "Architecture-adaptable finite element modelling". In the 1995 ACM/IEEE conference. New York, New York, USA: ACM Press, 1995. http://dx.doi.org/10.1145/224170.224501.

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Daud, Yusof, e Margaret Lucas. "Finite element modelling of ultrasonic extrusion". In International Congress on Ultrasonics. Vienna University of Technology, 2007. http://dx.doi.org/10.3728/icultrasonics.2007.vienna.1605_daud.

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Taha, Zahari, e Hasnun Arif Hassan Hassan. "FINITE ELEMENT MODELLING OF SOCCER BALL". In Movement, Health and Exercise 2014 Conference. Universiti Malaysia Pahang, 2014. http://dx.doi.org/10.15282/mohe.2014.ses.071.

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Tikka, Ajay C., Said F. Al-Sarawi e Derek Abbott. "Finite element modelling of SAW correlator". In Microelectronics, MEMS, and Nanotechnology, a cura di Dan V. Nicolau, Derek Abbott, Kourosh Kalantar-Zadeh, Tiziana Di Matteo e Sergey M. Bezrukov. SPIE, 2007. http://dx.doi.org/10.1117/12.764795.

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Agrawal, Arti. "Finite Element Modelling Methods for Photonics". In 2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2023. http://dx.doi.org/10.1109/cleo/europe-eqec57999.2023.10231355.

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Seed, G. M., e G. E. Cardew. "CFEL: A Finite Element Library". In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/cie-9051.

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Abstract An overview of an object-oriented class library, CFEL, for finite element modelling is presented. The structure and class hierarchies of CFEL are presented and how the library forms part of a larger computational modelling class framework, CML. The CML framework is a move towards a general framework for geometric computational modelling which unifies traditionally separate disciplines such as stress analysis and fluid flow. CML consists of the following set of core libraries for modelling: i) data structures, ii) element and structure geometric modelling, iii) material and geometric characteristics and iv) solid and fluid finite element modelling, of which CFEL is a member.

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Palermo, Giuseppe N., Renato Barboni e Manuel de Benedetti. "Finite Element Modelling of Triaxial Woven Fabric ..." In 56th International Astronautical Congress of the International Astronautical Federation, the International Academy of Astronautics, and the International Institute of Space Law. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.iac-05-c2.p.21.

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Rapporti di organizzazioni sul tema "Finite element modelling"

Prudencio, E. Parallel 3D Finite Element Numerical Modelling of DC Electron Guns. Office of Scientific and Technical Information (OSTI), febbraio 2008. http://dx.doi.org/10.2172/923310.

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Li, Tao, Xudong Qian, Hongyou Cao, Aziz Merchant, Ains Hussain, Amit Jain, Bernad A. P. Francis e Ankit Choudhary. FINITE ELEMENT MODELLING AND TEST OF A NOVEL COUPLING ARM CONNECTING TWO FLOATING BODIES. The Hong Kong Institute of Steel Construction, dicembre 2018. http://dx.doi.org/10.18057/icass2018.p.119.

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Babuska, I., e L. Li. The h-p Version of the Finite Element Method in the Plate Modelling Problem. Fort Belvoir, VA: Defense Technical Information Center, novembre 1990. http://dx.doi.org/10.21236/ada232246.

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Gunawardena, Yasoja K. R., e Farhad Aslani. FINITE ELEMENT MODELLING OF AXIALLY LOADED MILD STEEL HOLLOW SPIRAL WELDED STEEL TUBE SHORT COLUMNS. The Hong Kong Institute of Steel Construction, dicembre 2018. http://dx.doi.org/10.18057/icass2018.p.049.

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Kobayashi, Takaya, Naoki Nii, Takanobu Fujimura, Hiroshi Suganuma, Kenji Hayashi, Teruaki Inoue, Michiaki Yamamoto, Kantaro Sato e Shinobu Satonaka. Investigation and Research Into CAE Technique for Spot Weld Rupture (Part IV)~Finite Element Modelling. Warrendale, PA: SAE International, settembre 2005. http://dx.doi.org/10.4271/2005-08-0518.

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Hughes, Thomas J. An Assessment of Modelling Techniques for the Finite Element Analysis of Reinforced Concrete Plate and Shell Structures. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1988. http://dx.doi.org/10.21236/ada192263.

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Zheng, Jinhui, Matteo Ciantia e Jonathan Knappett. On the efficiency of coupled discrete-continuum modelling analyses of cemented materials. University of Dundee, dicembre 2021. http://dx.doi.org/10.20933/100001236.

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Abstract (sommario):

Computational load of discrete element modelling (DEM) simulations is known to increase with the number of particles. To improve the computational efficiency hybrid methods using continuous elements in the far-field, have been developed to decrease the number of discrete particles required for the model. In the present work, the performance of using such coupling methods is investigated. In particular, the coupled wall method, known as the “wall-zone” method when coupling DEM and the continuum Finite Differences Method (FDM) using the Itasca commercial codes PFC and FLAC respectively, is here analysed. To determine the accuracy and the efficiency of such a coupling approach, 3-point bending tests of cemented materials are simulated numerically. To validate the coupling accuracy first the elastic response of the beam is considered. The advantage of employing such a coupling method is then investigated by loading the beam until failure. Finally, comparing the results between DEM, DEM-FDM coupled and FDM models, the advantages and disadvantages of each method are outlined.

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Ansari, S. M., E. M. Schetselaar e J. A. Craven. Three-dimensional magnetotelluric modelling of the Lalor volcanogenic massive-sulfide deposit, Manitoba. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328003.

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Unconstrained magnetotelluric inversion commonly produces insufficient inherent resolution to image ore-system fluid pathways that were structurally thinned during post-emplacement tectonic activity. To improve the resolution in these complex environments, we synthesized the 3-D magnetotelluric (MT) response for geologically realistic models using a finite-element-based forward-modelling tool with unstructured meshes and applied it to the Lalor volcanogenic massive-sulfide deposit in the Snow Lake mining camp, Manitoba. This new tool is based on mapping interpolated or simulated resistivity values from wireline logs onto unstructured tetrahedral meshes to reflect, with the help of 3-D models obtained from lithostratigraphic and lithofacies drillhole logs, the complexity of the host-rock geological structure. The resulting stochastic model provides a more realistic representation of the heterogeneous spatial distribution of the electric resistivity values around the massive, stringer, and disseminated sulfide ore zones. Both models were combined into one seamless tetrahedral mesh of the resistivity field. To capture the complex resistivity distribution in the geophysical forward model, a finite-element code was developed. Comparative analyses of the forward models with MT data acquired at the Earth's surface show a reasonable agreement that explains the regional variations associated with the host rock geological structure and detects the local anomalies associated with the MT response of the ore zones.

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Zhang, Xingyu, Matteo Ciantia, Jonathan Knappett e Anthony Leung. Micromechanical study of potential scale effects in small-scale modelling of sinker tree roots. University of Dundee, dicembre 2021. http://dx.doi.org/10.20933/100001235.

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When testing an 1:N geotechnical structure in the centrifuge, it is desirable to choose a large scale factor (N) that can fit the small-scale model in a model container and avoid unwanted boundary effects, however, this in turn may cause scale effects when the structure is overscaled. This is more significant when it comes to small-scale modelling of sinker root-soil interaction, where root-particle size ratio is much lower. In this study the Distinct Element Method (DEM) is used to investigate this problem. The sinker root of a model root system under axial loading was analysed, with both upward and downward behaviour compared with the Finite Element Method (FEM), where the soil is modelled as a continuum in which case particle-size effects are not taken into consideration. Based on the scaling law, with the same prototype scale and particle size distribution, different scale factors/g-levels were applied to quantify effects of the ratio of root diameter (𝑑𝑟) to mean particle size (𝐷50) on the root rootsoil interaction.

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Edwards, Mervyn, Brian Robinson, Mike Stewart, James Hobbs e Tyler London. PPR2027 Research on Performance Test Procedures for Petroleum Road Fuel Tankers. TRL, febbraio 2024. http://dx.doi.org/10.58446/wrwu3932.

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The aim of the research reported was to develop ‘performance-based’ finite element modelling approaches and appropriate physical test procedures to approve petroleum road fuel tankers with novel designs that otherwise would not satisfy the current ‘design-based' requirements, i.e. to provide an alternative means of approval that gives more freedom to innovate while maintaining an equivalent (the same or a better) level of safety. The main conclusion of this research regarding the development of performance-based requirements for rollover safety is that the deflections and likelihood of major loss of containment experienced by road fuel tankers in real-world rollover scenarios can be replicated in a suitably specified, two-compartment subsection drop-test (or a full-scale physical topple test) supplemented by abrasion and penetration tests. The main outputs of this research were the (partial) development of performance-based test methods for rollover, together with an understanding (from associated finite element modelling) of the test parameters relevant to current tanker designs, and a route to their future adoption in standards and regulation in the form of an outline technical code for rollover resilience. A secondary output was the development of a better understanding of a frontal impact (tank rupture) scenario and the associated loading of the tank structure through the kingpin assembly / support structure.

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