Determination of forming limit diagrams of sheet materials with a hybrid experimental–numerical approach

2011 ◽  
Vol 53 (9) ◽  
pp. 707-719 ◽  
Author(s):  
Q. Situ ◽  
M.K. Jain ◽  
D.R. Metzger
Keyword(s):  
Numerical Approach ◽  
Forming Limit ◽  
Forming Limit Diagrams ◽  
Sheet Materials

Influence of Pre-Forming on the Forming Limit Diagram of Aluminum and Steel Sheets

2007 ◽  
Vol 344 ◽  
pp. 113-118 ◽  
Author(s):  
Massimo Tolazzi ◽  
Marion Merklein
Keyword(s):  
Dual Phase Steel ◽  
Process Analysis ◽  
Forming Limit Diagram ◽  
Forming Limit ◽  
Linear Strain ◽  
Forming Limit Diagrams ◽  
Steel Sheets ◽  
Biaxial Stretching ◽  
Strain Paths

This paper presents a method for the experimental determination of forming limit diagrams under non linear strain paths. The method consists in pre-forming the sheets under two different strain conditions: uniaxial and biaxial, and then stretching the samples, cut out of the preformed sheets, using a Nakajima testing setup. The optical deformation measurement system used for the process analysis (ARAMIS, Company GOM) allows to record and to analyze the strain distribution very precisely with respect to both time and space. As a reference also the FLDs of the investigated grades (the deep drawing steel DC04, the dual phase steel DP450 and the aluminum alloy AA5754) in as-received conditions were determined. The results show as expected an influence of the pre-forming conditions on the forming limit of the materials, with an increased formability in the case of biaxial stretching after uniaxial pre-forming and a reduced formability for uniaxial load after biaxial stretching if compared to the case of linear strain paths. These effects can be observed for all the investigated materials and can be also described in terms of a shifting of the FLD, which is related to the art and magnitude of the pre-deformation.

Determination of the Forming Limit Diagrams Using Image Analysis by the Corelation Method

CIRP Annals ◽  
1999 ◽  
Vol 48 (1) ◽  
pp. 227-230 ◽  
Author(s):  
P. Vacher ◽  
A. Haddad ◽  
R. Arrieux
Keyword(s):  
Image Analysis ◽  
Forming Limit ◽  
Forming Limit Diagrams

Time dependent determination of forming limit diagrams

CIRP Annals ◽  
2010 ◽  
Vol 59 (1) ◽  
pp. 295-298 ◽  
Author(s):  
M. Merklein ◽  
A. Kuppert ◽  
M. Geiger
Keyword(s):  
Time Dependent ◽  
Forming Limit ◽  
Forming Limit Diagrams

A Novel Approach to the Determination of Forming Limit Diagrams for Tailor-Welded Blanks

2013 ◽  
Vol 22 (11) ◽  
pp. 3210-3221 ◽  
Author(s):  
Hossein Mamusi ◽  
Abolfazl Masoumi ◽  
Ramin Hashemi ◽  
Ramazanali Mahdavinejad
Keyword(s):  
Forming Limit ◽  
Forming Limit Diagrams ◽  
Tailor Welded Blanks ◽  
Novel Approach
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