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In situ 3D study of ductile damage micromechanisms under shear and non-proportional loading

le 16 décembre 2021
à 13h30

Thilo MORGENEYER, Maître de recherche au Centre des Matériaux, Mines ParisTech

Thilo MORGENEYER

Thilo MORGENEYER

Résumé/Abstract :

Whilst research has focused for decades on damage and fracture at high levels of triaxial stress during proportional loading, the ductile damage mechanisms under shear loading are less clear. To gain insight into these mechanisms, 4D shear experiments are carried out using flat samples and by resorting to laminography imaging. Synchrotron laminography is suited to image regions of interest in large flat samples at micrometer resolution. Shear damage mechanisms for a dual phase steel and for two aerospace aluminium alloys are studied. They are investigated further by complementary nano-laminography on a stopped shear test in addition to correlative EBSD. Furthermore, the effect of a 'shear to tension' load path change on strain to fracture and associated damage mechanisms is assessed. The results are discussed using FE simulations.
 
Type :
Séminaires - conférences
Lieu(x) :
ENS Paris-Saclay
Amphithéâtre d'Alembert - 1Z18

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