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Communication Dans Un Congrès Année : 2010

On the Modelling of Laser Heating Deposition of Thermoplastic Composites

Résumé

When modelling thermoplastic carbon fiber prepeg (APC² from Cytec) tows placement process, you need to know about different aspects: thermal exchanges, material and mechanical evolution for instance, to predict about final quality part like quality of bonding and material health e.g. Here we propose a modelling of the heat transfer during the laser heating deposition, and a validation of the results obtained numerically, by different experimental techniques. About the thermal transfer model, we’ll have to deal first with high number of DOF (degree of freedom) due to the geometrical aspect of the process (thin layer deposited during long distance), and with the moving heating source. We’ll use a PGD method (proper generalized decomposition) to solve these problems. Then, the exchanges between the laser and the prepreg material have to be explicited, and eventually the exchanges between the composite part (plys already laid up) and the processing elements (like the mould or the compacting roller) need to be taken in account. On the second hand, we made experimental techniques to know the composite (prepreg) material temperature fields during the process. We had to beware about the intrusive nature of thermal sensors, and to take care about the validity of the temperature obtained by multiplying the kind of sensors employed and the conditions of using them. Different experiments are made both during the tow placement process and in more controlled experimental conditions (linear temperature regime for example) to validate the temperature values obtained with the sensors. Consequently, we’ll be able to have a critical idea about the validity of the temperature results obtained by experimental techniques and to compare them with the numerical ones. This will allow us to validate or invalidate the entire hypothesis made in the numerical modelling, like boundary conditions or material reaction to the laser heating, and to adapt them to deal with a realistic thermal modelling of laser heating deposition process. The future work will have to take in account the mechanical effects of the process on the part, and to couple them with the thermal ones. Thus, a first prediction about the quality of the bonding could be given. [NO PDF]
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Dates et versions

hal-01008599 , version 1 (17-06-2014)

Identifiants

  • HAL Id : hal-01008599 , version 1

Citer

Anaïs Barasinski, Francisco Chinesta, Eric Soccard, Arnaud Poitou. On the Modelling of Laser Heating Deposition of Thermoplastic Composites. Advances in Material Processing Technologies [AMPT2010], 2010, Paris, France. ⟨hal-01008599⟩
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