Multiphysics for Simulation of Forming Processes

Silva, Luísa; Laure, Patrice; Coupez, Thierry; Digonnet, Hugues

doi:10.1002/9781119116288.ch9

Cited by 3 publications

(3 citation statements)

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“…The numerical approach detailed here is largely used in multiphysics, multidomain and multiphase modeling of composites as summarized in Silva et al (2016). Theses advanced numerical techniques are based on mixed stabilized finite elements, Eulerian approaches and modified level-set techniques (Nakhoul et al, 2018), automatic anisotropic mesh adaptation and parallel computing (Digonnet et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

“…First of all, the numerical methods are briefly described. The methodology is that used in Rem3D software and it is based on an Eulerian approach (the whole injection cavity is meshed) and a stabilised Galerkin method, using a continuous approximation of the orientation tensor coupled to flow (Generalized Stokes behaviour), the thermal equation, the flow front evolution (using a level set method) and fibre orientation equations (Silva et al, 2016).…”

Section: Computation Of Fibre Orientation In Injection Mouldingmentioning

confidence: 99%

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Short fiber composite reinforcements

Férec

Laure

Silva

et al. 2021

Composite Reinforcements for Optimum Performance

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The chapter focuses on fibre reinforced thermoplastics or polymer composites which are mainly produced by injection and compression molding using particles having mostly cylindrical shape (short or long fibers made up of glass, carbon or flax). The aim of this fibre addition is to improve the mechanical properties of final parts. However these properties depends on the fibre orientation and therefore the knowledge of link between processing condition and final fiber orientations has a major importance.First the chapter contains results of experimental observations on fibre length distribution, concentration and orientation for complex enough situations in order to describe problems encountered in real industrial processes. It is explained how to get experimental measurements on orientation and interaction tensors from image analysis on polished cross sections or in situ micro-tomography. These information are useful to validate models presented in the next sections.The models describing the evolution of fibre orientation in a flow motion are mainly based on macroscopic tensors and Folgar Tucker's equation. We present also extensions of this equation which takes into account of non-Newtonian behaviour of polymer, confinement effect and interaction between fibers. Finally, a variety of theories predicting the total stress of fiber suspensions in a Newtonian and complex fluid are exposed.In the next section, an industrial software and its inherent numerical methods are described. Examples of numerical computations are presented for typical situations. Then the influence of the coupling between the fiber orientation and rheological behaviour of the suspension are analysed. The comparison with experimental data concerning fibre orientation prediction gives information on the validity and the influence of various parameters associated to these models.

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Section: Methodsmentioning

confidence: 99%

Section: Computation Of Fibre Orientation In Injection Mouldingmentioning

confidence: 99%

Short fiber composite reinforcements

Férec

Laure

Silva

et al. 2021

Composite Reinforcements for Optimum Performance

Self Cite

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“…• A single capillary (Chevalier et al, 2018) this option is relevant to develop a full understanding of the flow inside a single capillary cavity, but does not allow the full domain and the influence of its size and real boundary conditions to be taken into account. • The cavities between many wires (Silva et al, 2016) full modeling would provide the most exhaustive description of the relevant phenomena. However, a fully coupled 3D simulation…”

Section: Choice Of Scale and Domainmentioning

confidence: 99%

Multiphysics simulation of an anisothermal reactive spontaneous capillary rise between electric rotor wires

Moisy

Comas-Cardona²,

Désilles³

et al. 2023

Front. Mater.

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Introduction: The rotor is the mobile component of an electric motor. A wound rotor is composed primarily of a steel core with insulated copper wires wound around it, after which the winding is immersed into a liquid acrylate-based thermosetting resin bath whose role is to ensure the performance and durability of the motor. This impregnation with resin between the wires occurs under controlled temperature settings to facilitate resin flow and polymerization. This process does not involve any pressurization to further facilitate resin flow between the wires; this suggests that, in addition to viscous effects, capillary and gravity forces play a significant role in the impregnation process.Methods: Our ultimate objective is to evaluate the quality of this impregnation. Doing so requires the characterization and simulation of a multi-material and multiphysics process in which heat transfer, polymerization kinetics, and resin flow are strongly coupled. This paper presents a fully coupled macroscopic multiphysics simulation of a unidirectional thermo-regulated capillary rise set-up.Discussion: The modeling choices made produced a good level of agreement with experimental data and enable explanation of a sudden change of regime observed at 120°C, which can be attributed to the polymerization and thermal gradients and their impact on fluid dynamics.

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