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1765900 
Journal Article 
Forming limit diagram prediction of AA5052/polyethylene/AA5052 sandwich sheets 
Liu, J; Liu, Wei; Xue, Wei 
2013 
1 
Materials & Design
ISSN: 0264-1275
EISSN: 1873-4197 
46 
112-120 
WOS:000314870000015 
Metal-plastic sandwich sheet has received increasing
attention in aeronautical, automotive, marine and civil engineering industries due to its lower
density, higher specific flexural stiffness, better dent resistance, better sound and vibration
damping characteristics. In the present study, an AA5052/polyethylene/AA5052 sandwich sheet is
developed and its formabilities are investigated. A numerical simulation method based on the
Gurson-Tvergaard-Needleman (GTN) damage model is used for simulating the forming process of
sandwich sheet, in which the interface conditions between skin sheet and core materials are
considered by using the cohesive zone model (CZM). The rigid punch dome tests and the Nakazima
forming tests are carried out to build the forming limit diagrams (FLDs) of sandwich sheet. A
strain history method is applied to determine the limited strain. Comparisons between predictions
and experimental results validate the used numerical simulation method. Finally, the influences
of polyethylene's thickness on the formabilities of sandwich sheet are analyzed. Research
results show that: AA5052/polyethylene/AA5052 sandwich sheet has a better formability than
monolithic AA5052 sheet and the formability of AA5052/polyethylene/AA5052 sandwich sheet
increases with increasing the thickness of polyethylene core layer. (C) 2012 Elsevier Ltd. All
rights reserved. 
Forming limit diagram; Sandwich sheets; Aluminum alloy; Polyethylene; Numerical method