A methodology for determination of extended strain-based forming limit curve considering the effects of strain path and normal stress

2014 ◽  
Vol 229 (9) ◽  
pp. 1537-1547 ◽  
Author(s):  
R Hashemi ◽  
K Abrinia ◽  
G Faraji
Keyword(s):  
Strain Path ◽  
Flow Direction ◽  
Plane Stress State ◽  
Forming Limit ◽  
Limit Curve ◽  
Forming Limit Curve ◽  
Path Dependent ◽  
New Criterion ◽  
State Assumption

In this paper, an approach based on the modified Marciniak-Kuczynski (M-K) method for computation of an extended strain-based forming limit curve (FLC) is presented. An extended strain-based FLC is built based on equivalent plastic strains and material flow direction at the end of forming. This curve has some advantages in comparison with other necking criteria such as the traditional FLC and also the stress-based FLC. This new criterion is much less strain path dependent than the conventional FLC. Furthermore, the use and interpretation of this new curve is easier than the stress-based FLC. The effect of strain path on the predicted extended strain-based FLC is reexamined. For this purpose, two types of pre-straining on the sheet metal have been imposed. Moreover, the plane stress state assumption is not adopted in the current study. The verifications of the theoretical FLCs are performed by using some available published experimental data.

Prediction of strain path and forming limit curve of AHSS by incorporating microstructure evolution

2020 ◽  
Vol 106 (11-12) ◽  
pp. 5085-5098 ◽  
Author(s):  
Shanta Chakrabarty ◽  
Marrapu Bhargava ◽  
Harsh Kumar Narula ◽  
Prita Pant ◽  
Sushil K. Mishra
Keyword(s):  
Microstructure Evolution ◽  
Strain Path ◽  
Forming Limit ◽  
Limit Curve ◽  
Forming Limit Curve

scholarly journals Determination of forming limit curve by finite element method simulations

2019 ◽  
Vol 27 ◽  
pp. 78-82 ◽  
Author(s):  
D. Lumelskyj ◽  
J. Rojek ◽  
L. Lazarescu ◽  
D. Banabic
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Forming Limit ◽  
Limit Curve ◽  
Forming Limit Curve ◽  
Element Method

A New Workability Criterion for Ductile Metals

1986 ◽  
Vol 108 (3) ◽  
pp. 245-249 ◽  
Author(s):  
V. Vujovic ◽  
A. H. Shabaik
Keyword(s):  
Effective Stress ◽  
Forming Limit ◽  
Limit Curve ◽  
Forming Process ◽  
Forming Limit Curve ◽  
Ductile Metals ◽  
State Of Stress ◽  
Forming Limit Curves ◽  
Hydrostatic Component

The forming limit curves are important aids in determining the extent of deformation a material can be subjected to during a forming process. In this paper a forming limit criterion for bulk metalworking processes, based on the magnitude of the hydrostatic component and the effective stress of the state of stress, is proposed. The determination of the forming limit curve by means of three simple tests, namely, tension, compression, and torsion tests, is presented.

The Effect of Model Parameters on Predicted Stress Based Failure Criterion for Sheet Metal

2008 ◽  
Author(s):  
Matthew J. Derov ◽  
Brad L. Kinsey ◽  
Igor Tsukrov
Keyword(s):  
Sheet Metal ◽  
Failure Criterion ◽  
Strain Path ◽  
Path Dependence ◽  
Prediction Method ◽  
Forming Limit ◽  
Model Parameters ◽  
Analytical Prediction ◽  
Limit Curve ◽  
Forming Limit Curve

Tearing failure in sheet metal forming has traditionally been predicted based on the strain state of the material. However, a concern with this failure prediction method is that the strain based forming limit curve exhibits significant strain path dependence. A stress based failure criterion has been proposed and shown to be less sensitive to the strain path through numerical simulations and by analytically converting strain based data to stress space. However, a means to predict this stress based failure criterion without prior knowledge of the strain based forming limit curve for sheet metal is required. In this paper, an analytical prediction of the stress based forming limit curve is derived and compared to experimental and numerical results. The effects of model parameters are also investigated.

scholarly journals Forming Limit Curve Determination of a DP-780 Steel Sheet

2015 ◽  
Vol 8 ◽  
pp. 978-985 ◽  
Author(s):  
Claudio D. Schwindt ◽  
Mike Stout ◽  
Lucio Iurman ◽  
Javier W. Signorelli
Keyword(s):  
Steel Sheet ◽  
Forming Limit ◽  
Limit Curve ◽  
Forming Limit Curve ◽  
Curve Determination
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