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A calculating model of material constants in ductile fracture criterion and its applications
Received date: 2014-02-26
Revised date: 2014-04-14
Online published: 2014-04-17
Supported by
National Natural Science Foundation of China (50975014); Funds for International Cooperation and Exchange of the Na-tional Natural Science Foundation of China(Sino-Russia)(51010166)
To determine material constants of ductile fracture criteria which are in accord with sheet deforming regularity, based on the theoretical framework of the conventional M-K model and some reasonable modification, a new computational model is derived by combining data of uniaxial tension with that of plane strain tests. Through compiling the algorithm program in MATLAB, material constants of various ductile fracture criteria are determined by using data of aluminium magnesium alloy 5A06-O sheet. The C&L ductile fracture criterion is written into the subroutine VUMAT which is embedded in Abaqus/Explicit. Then, numerical simulations of aluminium magnesium alloy 5A06-O sheet warm hydrobulging and hydroforming are conducted at 200℃. Compared with the experimental results with the same processing parameter, the errors of warm hydrobulging height and warm hydroforming height do not exceed 6.2% and 8.5% respectively. Thus, the results show that the validity of the model is verified and the application of the C&L ductile fracture criterion in sheet warm hydrobulging and hydroforming is effective.
LANG Lihui , YANG Xiying , LIU Kangning , CAI Gaocan , GUO Chan . A calculating model of material constants in ductile fracture criterion and its applications[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(2) : 672 -679 . DOI: 10.7527/S1000-6893.2014.0054
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