Simulation de la mise en forme des composites thermoplastiques
Elément fini de coque à pincement pour l’analyse de la reconsolidation
Keywords:
composites, forming, porosities, shell finite element, transverse stress, pinching lockingAbstract
A shell finite element with transverse stress is proposed in this paper in order to simulate the forming of thermoplastic composites reinforced with continuous fibres. This shell finite element which doesn’t use the classical assumption of zero normal stress component through the thickness is necessary to simulate the reconsolidation stage which have an essential role to remov some defaults like porosities. The proposed shell finite element keeps the five degrees of freedom of the standard shell elements and adds a sixth one which is the variation in thickness. A”pinching” locking phenomena is avoided by uncoupling bending and pinching in the behaviour operator. A set of classical validation tests prove the efficiency of this approach. Finally, a forming process is simulated. It shows that the computed transverse stresses are in good agreement with porosity removing in the experiments.
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