Numerical simulation of ductile fracture behavior for
aluminum alloy sheet under cyclic plastic deformation
aluminum alloy sheet under cyclic plastic deformation
(1. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China;
2. Shanghai Key Laboratory of Digital Auto-body Engineering,
Shanghai Jiao Tong University, Shanghai 200240, China)
2. Shanghai Key Laboratory of Digital Auto-body Engineering,
Shanghai Jiao Tong University, Shanghai 200240, China)
Abstract: A numerical analysis of mechanical behavior of aluminum alloy sheet under cyclic plastic deformation was investigated. Forming limit at fracture was derived from Cockcroft-Latham ductile damage criterion. The strain path of bending center of incremental roller hemming could be accepted as a kind of plane strain bending deformation process. Incremental rope roller hemming could be used to alleviate ductile fracture behavior by changing the stress state of the hemming-effected area. SEM observation on the fracture surface indicates that cyclic plastic deformation affects ductile fracture mechanism.
Key words: aluminum alloy; ductile damage; incremental forming; cyclic plastic deformation