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Incompatibility, shrinking and folding : Residual stresses in additive manufacturing

le 11 octobre 2018
à 13h30

Andrei Constantinescu, Directeur de Recherche CNRS au Laboratoire LMS (Ecole Polytechnique), interviendra lors d'un séminaire.

3D-printing is an innovative technique to manufacture three-dimensional objects with complex shape. Processed materials are metals, ceramics or polymers depending on the working principle of the printer. During the point- or layer-wise printing the material experiences a transition from a liquid to a solid and a temperature change accompanied by changes in the thermomechanical and caloric material behavior. The process leads to gradients in the material properties and to residual stresses which influence the mechanical behavior and the shape of the structure in desired or undesired manners. Since the processed materials are inelastic these effects depend on time and temperature and the parameters of the printing and post-treatment process. Due to the lack of understanding, missing constitutive models and simulation tools, such problems are usually faced by costly trial-and-error methods. 

The presentation will focus on residual stresses and will cover both general aspects of incompatible strains and their modelling as well as use these concepts to explore several aspects in additive manufacturing like self-folding and self-buckling.
Type :
Séminaires - conférences
Lieu(x) :
Campus de Cachan
Bâtiment Léonard de Vinci
Amphi E-media

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