Springback investigation of anisotropic aluminum alloy sheet with a mixed hardening rule and Barlat yield criteria in sheet metal forming

2010 ◽  
Vol 31 (4) ◽  
pp. 2043-2050 ◽  
Author(s):  
Bingtao Tang ◽  
Xiaoyang Lu ◽  
Zhaoqing Wang ◽  
Zhen Zhao
Keyword(s):  
Aluminum Alloy ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet ◽  
Yield Criteria ◽  
Mixed Hardening ◽  
Hardening Rule

Effect of Lubrication Conditions on the Forming Limit of Deep Drawing of 6061 Aluminum Alloy Sheet

2019 ◽  
Vol 944 ◽  
pp. 85-91
Author(s):  
Yan Qi Wang ◽  
Yong Qi Cheng ◽  
Peng Zhang ◽  
Gan Luo ◽  
Peng Bin Li ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Sheet Metal Forming ◽  
Deep Drawing ◽  
Metal Forming ◽  
Alloy Sheet ◽  
Forming Limit ◽  
Oil Lubrication ◽  
Aluminum Alloy Sheet ◽  
Ptfe Film ◽  
6061 Aluminum Alloy

With the development of lightweight vehicles, aluminum alloy sheets are increasingly used in the automotive field. However, the aluminum alloy sheet has poor forming performance at room temperature. Therefore, how to improve the sheet metal forming performance of aluminum alloy sheet has become one of the current research hotspots. In this paper, the effects of different lubricants on the deep drawing forming properties of 6061 aluminum alloy sheets were studied by cupping experiments. The effects of lubricants on the deep drawing of sheet metal forming and the wall thickness of cups after deep drawing were explored. The results show that under the condition of drawing speed of 3MPa and 200mm/min, the ultimate drawing ratio of the sheet under oil lubrication is 1.92, and the PTFE film is 2.16. Grease and graphite lubrication are respectively 2.12 and 2.03, using PTFE film lubrication can increase by about 10% contrast with the oil lubrication. The measurement of the wall thickness of the cup under the forming limit state shows that the position with the largest reduction rate appears in the rounded transition zone, and the wall portion of the cylindrical member increases with the height of the wall, and the thickness from the bottom of the cup to the bottom of the cup. The edges all show a trend of decreasing first and then increasing.

Effect of the Mechanical Parameters Used as Input Data in the Yield Criteria on the Accuracy of the Finite Element Simulation of Sheet Metal Forming Processes

2013 ◽  
Vol 554-557 ◽  
pp. 204-209 ◽  
Author(s):  
Lucian Lazarescu ◽  
Ioan Ciobanu ◽  
Ioan Pavel Nicodim ◽  
Dan Sorin Comsa ◽  
Dorel Banabic
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Sheet Metal ◽  
Yield Surface ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Yield Criteria ◽  
Numerical Predictions ◽  
Element Simulation ◽  
Hydraulic Bulging

The accuracy of the finite element simulation of sheet metal forming processes is mainly influenced by the shape of the yield surface used in the mechanical model and, in particular, by the number of input values used in the identification of the yield surface. This paper investigates the effect of the input values used for identifying the BBC 2005 yield criterion on the accuracy of the finite element predictions. The accuracy assessment of the simulation is based on the comparison of the numerical predictions obtained using the commercially available FE programme AUTOFORM and experimental measurements obtained from the hydraulic bulging of sheet metals. Thickness and strain distributions, as well as the geometry of the bulged specimen were taken as comparison parameters. The accuracy of the finite element predictions obtained using the Hill-48 and Barlat-89 yield criteria is also studied and discussed in comparison with the results provided by the BBC 2005 yield and the experimental data.

scholarly journals Process metallurgy design for high-formability aluminum alloy sheet metal generation by using two-scale FEM

2011 ◽  
Vol 10 ◽  
pp. 2250-2255 ◽  
Author(s):  
Hiroyuki Kuramae ◽  
Hidetoshi Sakamoto ◽  
Hideo Morimoto ◽  
Eiji Nakamachi
Keyword(s):  
Aluminum Alloy ◽  
Sheet Metal ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet ◽  
Process Metallurgy
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