Guillaume Wasselynck

Microscopic and macroscopic electromagnetic and thermal modeling of Carbon Fiber Reinforced Polymer Composites

An electromagnetic and thermal model of carbon fiber reinforced polymer composite material is introduced. This model takes into account the influence of different fiber orientations on the electromagnetic parameters. These parameters are defined in microscopic scale and introduced in finite-element-method model in macroscopic scale.

Interaction Between Electromagnetic Field and CFRP Materials: A New Multiscale Homogenization Approach

In this paper, a new multiscale homogenization method is introduced to calculate the field and current distribution inside carbon fiber reinforced polymer composites submitted to an external electromagnetic field. In the microscopic scale, the real structure of the material is taken into account and electromagnetic and electrical equivalent properties are calculated using finite-element method (FEM). In the macroscopic scale, these properties are introduced in an impedance network or in an anisotropic-finite elements method according to the working frequency. The simulating results are in accordance with experimental ones and will allow a better modeling of composites.

Determination of the Electrical Conductivity Tensor of a CFRP Composite Using a 3-D Percolation Model

In this paper a percolation model is used to determinate the electrical conductivity tensor of one layer of carbon fiber composite. For this kind of material, fibers are randomly distributed in the resin. To take into account this distribution a virtual 3-D material model is developed and coupled with a homogenization method to overcome the scale factor problem. The electrical conductivity tensor is then used to simulate the induction heating of a multilayer composite.

3-D Modeling of Thermo Inductive Non Destructive Testing Method Applied to Multilayer Composite

In this paper, a 3-D modeling of a thermo inductive nondestructing testing (NDT) technique applied to carbon fiber reinforced polymer (CFRP) composite is presented. A multiscale approach is used to calculate the electromagnetic and thermal field distribution. The relevance of the technique is then discussed for different positions of flaws and the optimal frequency is estimated.

Design Optimization of High-Speed PMSM for Electric Vehicles

In this article, a design methodology applied to the case of high speed permanent magnet machines for electric vehicles is presented. The case of small power urban use vehicles is discussed. After a presentation of the analytical model used, it will be shown that, from a driving cycle, it is possible to formulate analytically the solution that maximizes the power density of the machine. Some design rules will be presented in order to optimize magnetic materials, the frequency conversion and the gear ratio.

Performance Assessment of Induction Thermography Technique Applied to Carbon-Fiber-Reinforced Polymer Material

In this paper, a model is built to evaluate the flaw detection capacity of the induction thermography applied to nondestructive testing (NDT) of carbon-fiber-reinforced polymer composite. A homogenization approach is used to overcome the large-scale factor. The homogenized electric conductivity obtained is used in a 3-D multilayer finite element model. The problem is discretized by hexahedral element to deal with the numeric instability of tetrahedron element in the modeling of thin and strongly anisotropic domain. The distribution of current in the induction coil is also considered to improve the accuracy of the solution. Numerical model is then validated by comparison with measurement. Simulation of an NDT case with induction thermography will be discussed.

Thermo inductive nondestructive testing method applied to CFRP

Purpose – In this paper, a thermo inductive nondestructing testing (NDT) modeling applied to carbon fiber reinforced polymer (CFRP) composite is presented. The paper aims to discuss these issues. Design/methodology/approach – A multi-scale approach is used to calculate the electromagnetic and thermal field distribution. Findings – The temperature perturbation due to the presence of flaws can be detected at the surface of the composite by an infrared camera. Originality/value – The developed 3D thermomagnetic model can be used to study the efficiency of the thermal inductive method for different kind of flaws, inductors and frequencies.

Electrical conductivity tensor modelling of stratified woven-fabric carbon fiber reinforced polymer composite materials

In this paper, a new multi-scale approach to predict the effective electrical conductivity tensor of a woven-fabric composite layer is presented. The result is then used to model the behaviour of a stratified composite material composed by a pileup of woven-fabric layers with different relative orientations. To take into account the orientation and the anisotropy of the material a 3D multilayer hexahedral degenerated elements method is used to model the anisotropic plate. This approach enables to take account random distribution of carbon fibers in the yarns, 3D effects and electric percolation threshold with an acceptable numerical cost. The developed model is then validated by experimental results.

Degenerated Hexahedral Whitney Elements for Electromagnetic Fields Computation in Multi-Layer Anisotropic Thin Regions

In this paper, the use of a degenerated hexahedral Whitney elements method in the modeling of multi-layer anisotropic regions is presented. The elements degenerated from hexahedral elements are used to model laminated composites at the elementary-ply scale considering the circulation of eddy-currents along the thickness of the material. Eddy-current problem is solved using the A - Φ formulation.

Application of Degenerated Hexahedral Whitney Elements in the Modeling of NDT Induction Thermography of Laminated CFRP Composite

In this paper, degenerated hexahedral Whitney elements are used to model carbon-fiber-reinforced polymer composites in nondestructive testing induction thermography technique. These elements avoid meshing the thin regions of composite and consider the anisotropic multilayer characteristic of the materials and also the flaws inside their volume. The eddy-current problem is solved using A - Φ formulation. The accuracy of this method is shown by comparison with the classical hexahedral elements.