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

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.

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.

New Methodologies for the Determination of Precise Forming Limit Curve in Single Point Incremental Forming Process

2010 ◽  
Vol 97-101 ◽  
pp. 126-129 ◽  
Author(s):  
Ghulam Hussain ◽  
Gao Lin ◽  
Nasir Hayat ◽  
Nameem Ullah Dar ◽  
Asif Iqbal
Keyword(s):  
Incremental Forming ◽  
Single Point ◽  
Forming Limit ◽  
Single Point Incremental Forming ◽  
Limit Curve ◽  
Forming Process ◽  
Forming Limit Curve ◽  
Groove Test ◽  
New Methodologies

Straight groove test is a widely-used formability test in Single Point Incremental Forming (SPIF). This test does not cover all the forming aspects of SPIF process, however. In order to ascertain its legitimacy, two new tests covering necessary SPIF aspects are devised. The FLC of an aluminum sheet is determined using the newly proposed and straight groove tests. It is found that the straight groove test shows much lower formability than the new tests. Therefore, the employment of newly devised test(s) is proposed for the determination of precise formability limits.

A Study on Modified Maximum Force Criterion to Predict Forming Limit Curve of Stainless Steel Sheet

2011 ◽  
Vol 311-313 ◽  
pp. 916-921
Author(s):  
Duc Toan Nguyen ◽  
Tien Long Banh ◽  
Dong Won Jung
Keyword(s):  
Stainless Steel ◽  
Steel Sheet ◽  
Strain Ratio ◽  
Maximum Force ◽  
Forming Limit ◽  
Stainless Steel Sheet ◽  
Limit Curve ◽  
Forming Limit Curve ◽  
Hardening Law ◽  
Force Criterion

In order to predict forming limit curve for stainless steel sheet, the modified maximum force criterion (MMFC), introduced by Hora et al (1996 A prediction method for ductile sheet metal failure in FE-simulation Proc. Numisheet’96 Conf. pp 252–256), was adopted follow Swift’s hardening law. After comparing with experimental results, the improvement of MMFC model for FLD’s prediction were proposed based on Swift’s hardening law by representing work hardening coefficient as a function of strain ratio (β). The proposed MMFC model shows in good agreement between FLD’s computational and experimental result for stainless steel sheet. The results of proposed MMFC model also show that the stress-strain curves of sheets materials are difference at each strain ratio.

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