Anaïs Barasinski

An Improvement in Thermal Modelling of Automated Tape Placement Process

The thermoplastic tape placement process offers the possibility of manufacturing large laminated composite parts with all kinds of geometries (double curved i.e.). This process is based on the fusion bonding of a thermoplastic tape on a substrate. It has received a growing interest during last years because of its non autoclave abilities.In order to control and optimize the quality of the manufactured part, we need to predict the temperature field throughout the processing of the laminate. In this work, we focus on a thermal modeling of this process which takes in account the imperfect bonding existing between the different layers of the substrate by introducing thermal contact resistance in the model. This study is leaning on experimental results which inform us that the value of the thermal resistance evolves with temperature and pressure applied on the material.

Processing of a carbon fiber reinforced polymer (CFRP) laminate part by microwaves

Microwave (MW) technology relies on volumetric heating. Thermal energy is transferred through electromagnetic fields to materials that can absorb it at specific frequencies. The principal objective of this work is to model and simulate the interactions of the MW field with a composite laminated part, consisting of a stack of layers of different orientations, each layer made of resin matrix and carbon fibers.

Simulation of microwave heating of a composite part in an oven cavity

Microwave (MW) technology relies on volumetric heating. Thermal energy is transferred to the material that can absorb it at specific frequencies. In this paper, a coupled thermic and electromagnetic model is proposed in order to simulate the emerging process of microwave heating for composite materials. Solving the problem in a laminated composite material requires a high degree of discretization in the thickness direction which is made possible by introducing the in-plane-out-of-plane decomposition approach using the Proper Generalized Decomposition (PGD).Microwave (MW) technology relies on volumetric heating. Thermal energy is transferred to the material that can absorb it at specific frequencies. In this paper, a coupled thermic and electromagnetic model is proposed in order to simulate the emerging process of microwave heating for composite materials. Solving the problem in a laminated composite material requires a high degree of discretization in the thickness direction which is made possible by introducing the in-plane-out-of-plane decomposition approach using the Proper Generalized Decomposition (PGD).

Modeling the evolution of thermal contact resistance between two thermoplastic pre-impregnated tapes considering the real surface

In this work, we address the modeling of in-situ consolidation considering the real description of the surfaces between two pre-impregnated (pre-pregs) tapes. A walevet-based description is used to represent the real surface between pre-pregs, using the Haar wavelet. Since the surface is well described, in order to carry out the compression of both surfaces for consolidating, the flow model during the compression of each asperity is discussed: lubrication hypotheses considering partial wall slip condition at the asperities interfaces are compared to the fully numerical solution of Newtonian and non-Newtonian flows. Once the surface deformation is properly described, the thermal contact resistance is obtained by solving the thermal problem during the compression process of both surfaces. In order to make possible the fully numerical solution of all scales involved in the surface representation (due to its fractal nature), both, the Stokes and the thermal problems are solved by using the Proper Generalized ...

Model of laser/composite interaction based on scattering by multiple cylinders

In the context of processing long-fiber reinforced thermoplastic composites with laser-heating, the spatial distribution of the heat flux is one of the main parameters which controls the induced processing temperature. Unfortunately, the illuminated geometry might be not trivial, and the optical properties related to absorption and scattering phenomena of such a material are not well-established. In order to study and characterize the laser/composite interaction at the scale of the micro-structure, a model based on multiple cylinders is envisaged. The method consists in the calculation of a semi-analytical solution for the electromagnetic scattering from an array of circular cylinders due to an obliquely incident plane wave.

Simulation of the propagation of an electromagnetic field in a laminated composite part: Application to microwave heating

A coupled thermic and electromagnetic model is proposed in this paper in order to simulate the emerging process of microwave heating for composite materials. Solving the problem in a laminated composite material requires a high degree of discretization in the thickness direction which is made possible by introducing a new simulation approach using the Proper Generalized Decomposition (PGD).

ELECTRICAL FIELDS SIMULATION IN HETEROGENOUS DOMAINS USING THE PROPER GENERALIZED DECOMPOSITION

Recently microwave heating is replacing classical methods in composite manufacturing processes. In fact one of the advantages of microwave heating is achieving a volumetric heating, which can improve the final material properties. However electrical and magnetic fields propagation is complicated to simulate and understand inside a heterogeneous domain. In fact, carbon fibers are highly conductor with respect to the composite matrix. Such behavior would alter the wave propagation inside the part and reduces the desired volumetric heating effects. In this work, we simulate the propagation of electric fields inside a heterogeneous part by using the Proper Generalized Decomposition (known as PGD). In fact this method helps us achieving full 3D simulations by the complexity of few 1D simulations.