Enrico Lai
FE Simulation of the Hole Expansion Experimental Test of High Strength Aluminium Alloys.
Rel. Giovanni Belingardi, Michael Worswick. Politecnico di Torino, Corso di laurea magistrale in Automotive Engineering (Ingegneria Dell'Autoveicolo), 2020
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Abstract
Edge failure is one of the major problems associated with forming operations of metal sheets. During the recent years, some Aluminium Alloys, as AA7075, are gaining attention and interest in academia due to their increasing utilization in manufacturing processes, especially in the automotive. As a result, there is an interest in developing numerical techniques able to predict the edge failure in forming simulations and consequently optimize the forming operations in the automotive industry for vehicle light-weighting, in agreement with the most recent regulations. The stretch-flangeability of AA7075-T6 were predicted with FE hole expansion simulations involving different boundary conditions, as temperature and punch shape variations.
The standard conical punch as well as a custom flat punch were used to investigate how punch shape affect the formability when the hole is expanded out-of-plane (conical punch) and in-plane (flat punch)
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