Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 25, Issue 10, Pages 3389-3398Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(15)63974-7
Keywords
MK model; ductile fracture criteria; warm hydroforming; through-thickness normal stress
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Funding
- National Natural Science Foundation of China [51175024]
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A modified MK model combined with ductile fracture criterion (DFC-MK model) is proposed to compute the forming limit diagrams (FLDs) of 5A06-O aluminum alloy sheet at different temperatures. The material constant (C) of ductile fracture criterion and initial thickness imperfection parameter (f(0)) at various temperatures are determined by using a new computing method based on wide sheet bending test. The FLDs at 20 and 200 degrees C are calculated through the DFC-MK model. The DFC-MK model, which includes the influence of through-thickness normal stress, is written into the subroutine VUMAT embedded in Abaqus/Explicit. The cylindrical cup hydroforming tests are carried out to verify the model. The results show that compared with experimental observations, the predicted FLDs based on DFC-MK model are more accurate than the conventional MK model; the errors between the simulations and experiments in warm hydroforming are 8.23% at 20 degrees C and 9.24% at 200 degrees C, which verify the effectiveness of the proposed model.
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