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Couplage thermomécanique lors de la soudure par ultrasons : application pour les thermoplastiques

Duc Ha Minh 1
1 Dynamique des structures et identification
navier umr 8205 - Laboratoire Navier
Abstract : This thesis presents a thermomechanical coupling for advanced modeling of welding processes, especially the ultrasonic welding for thermoplastic materials. The mode of operation of welding machines and the behaviour of welding materials must be well known. Consequently, the properties of these materials, especially those required for finite element modelling, are identified. The mechanical and thermal parameters are measured in static mode and are compared with results calculated by homogenization. Some parameters are also measured dynamically and show a dependency on frequency and temperature. This is very useful because the materials are solicited at high ultrasonic frequency and the temperature during the welding changes significantly. The welding ultrasonic machine (the acoustic ensemble) has already been designed and manufactured. The modelling by finite element in 3D with ABAQUS shows good modal and vibration behaviours. Then, the welding materials are introduced by modelling the dynamic contact between the acoustic ensemble and welding band. This model allows us to determine the contact duration and the compression in the materials depending on the applied load. The dissipation of energy that is generated by viscosity of welding materials is calculated and included in the thermomechanical coupled model. The heat transfer in the whole system is modeled and enable to compute the temperature field, especially the temperature at the interface between two layers of welding materials. This model is completed using the ALE (Arbitrary Lagrangian Eulerian) method to take into account the displacement of the welding bands
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Duc Ha Minh. Couplage thermomécanique lors de la soudure par ultrasons : application pour les thermoplastiques. Autre. Université Paris-Est, 2009. Français. ⟨NNT : 2009PEST1081⟩. ⟨tel-00584401⟩

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