A comparative study of forming limit diagram prediction of tailor welded blanks

2014 ◽  
Vol 8 (2) ◽  
pp. 293-304 ◽  
Author(s):  
R. Safdarian ◽  
R. M. Natal Jorge ◽  
Abel D. Santos ◽  
H. Moslemi Naeini ◽  
M. P. L. Parente
Keyword(s):  
Comparative Study ◽  
Forming Limit Diagram ◽  
Forming Limit ◽  
Tailor Welded Blanks

Comparison of different welding methods on mechanical properties and formability behaviors of tailor welded blanks (TWB) made from AA6061 alloys

2020 ◽  
pp. 095440622095250
Author(s):  
Behrouz Bagheri ◽  
Mahmoud Abbasi ◽  
Reza Hamzeloo
Keyword(s):  
Mechanical Properties ◽  
Laser Welding ◽  
Co2 Laser ◽  
Forming Limit Diagram ◽  
Dome Height ◽  
Forming Limit ◽  
Welding Parameters ◽  
Friction Stir ◽  
Tailor Welded Blanks ◽  
Different Characteristics

A tailor welded blank (TWB) includes two or more blanks joined together in order to make a single blank. Different welding methods are used to join blanks with different characteristics and form TWBs. In this study, a comparison is made among the effects of three different welding methods namely CO2 laser welding, friction stir welding (FSW), and friction stir vibration welding (FSVW) on mechanical and formability properties of developed TWBs. AA6061 alloy sheets with different thicknesses (1.2 and 0.8 mm) are joined to get TWBs. The forming limit diagram (FLD) and limiting dome height (LDH) are applied to assess the formability. The Taguchi method is applied to find the optimum values of welding parameters. It is concluded that TWBs made by FSVW have higher mechanical properties and formability compared to TWBs made by FSW and CO2 laser welding. The results also indicate that FLD for TWBs made by FSW is higher than FLD for TWBs made by CO2 laser welding and FLD0, for TWBs made by FSVW, increases as vibration frequency increases.

Establishment and Application of Forming Limit Diagram of Multi-Gauge Laser Tailor-Welded Blanks

2010 ◽  
Vol 97-101 ◽  
pp. 420-425
Author(s):  
Wei Chen ◽  
S. Cheng ◽  
Y. Ding ◽  
Y.Q. Guo ◽  
L. Xue
Keyword(s):  
High Strength Steel ◽  
Research Method ◽  
Forming Limit Diagram ◽  
High Strength ◽  
Failure Criteria ◽  
Limit Strain ◽  
Measuring System ◽  
Forming Limit ◽  
Forming Process ◽  
Tailor Welded Blanks

The method for establishing the forming limit diagram (FLD) of multi-gauge high strength steel laser tailor-welded blanks (LTWB) is introduced based on analyzing the failure mechanism of multi-gauge LTWB. The Nakazima test is performed to generate the limit strain of multi-gauge high strength steel LTWB. By means of the ARGUS strain measuring system, the limit strain is measured and the FLD of LTWB is plotted subsequently. The FLD established by the Nakazima test is introduced into the FEA forming process as the failure criteria. Compared with the predicted result of the FLD of thinner metal, better correlation between the simulation and experimental results is indicated by adopting the FLD of LTWB as the necking criteria, which also reveals the validity and practicability of the FLD research method for multi-gauge high strength steel LTWB.

A comparative study of the forming-limit diagram models for sheet steels

1998 ◽  
Vol 83 (1-3) ◽  
pp. 223-230 ◽  
Author(s):  
Wolfgang Bleck ◽  
Zhi Deng ◽  
Kostas Papamantellos ◽  
Christopher Oliver Gusek
Keyword(s):  
Comparative Study ◽  
Forming Limit Diagram ◽  
Forming Limit ◽  
Sheet Steels

Formability Analysis of Tailor-Welded Blanks of Different Thickness Ratios

2005 ◽  
Vol 127 (4) ◽  
pp. 743-751 ◽  
Author(s):  
L. C. Chan ◽  
C. H. Cheng ◽  
S. M. Chan ◽  
T. C. Lee ◽  
C. L. Chow
Keyword(s):  
Finite Element ◽  
Forming Limit Diagram ◽  
Thickness Ratio ◽  
Forming Limit ◽  
Uniaxial Tensile ◽  
Base Metals ◽  
Steel Sheets ◽  
Major Strain ◽  
Tailor Welded Blanks ◽  
Different Thickness

This paper presents a formability analysis of tailor-welded blanks (TWBs) made of cold rolled steel sheets with varying thicknesses. Steel sheets ranging between 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1.0 mm in thickness were used to produce TWBs of different thickness combinations. The primary objective of this paper is to characterize the effects of thickness ratios on the forming limit diagram (FLD) for a particular type of TWB. The TWBs chosen for the investigation are designed with the weld line located in the center of the specimens perpendicular to the principal strain direction. Nd:YAG laser butt-welding was used to prepare different tailor-made blank specimens for uniaxial tensile tests and Swift tests. The experimental results of the uniaxial tensile test clearly revealed that there were no significant differences between the tensile strengths of TWBs and those of the base metals. After the Swift tests, the formability of TWBs was analyzed in terms of two measures: The forming limit diagram and minimum major strain. The experimental findings indicated that the higher the thickness ratio, the lower the level of the forming limit curve (FLC) and the lower the formability of the TWBs. The findings also show an inverse proportional relationship between thickness ratios and minimum major strains. TWBs with a thickness ratio of close to 1 were found to have a minimum major strain closer to those of base metals. The effects of different thickness ratios on TWBs were further analyzed with a finite element code in a computer-aided engineering package, PAM-STAMP, while the failure criteria of the TWBs in the finite element analysis were addressed by the FLCs which were obtained from the experiments. However, the weld of the TWB in the simulation was simply treated as a thickness step, whereas its heat affected zones were sometimes disregarded, so that the effects of the thickness ratio could be significantly disclosed without the presence of weld zones. The results of the simulation should certainly assist to clarify and explain the effects of different thickness ratios on TWBs.

A new concept in obtaining a forming limit diagram of tailor welded blanks

2011 ◽  
Vol 46 (8) ◽  
pp. 740-748 ◽  
Author(s):  
A Menhaj ◽  
M Abbasi ◽  
M Sedighi ◽  
M Ketabchi
Keyword(s):  
Steel Sheet ◽  
Yield Criterion ◽  
Forming Limit Diagram ◽  
Galvanized Steel ◽  
Forming Limit ◽  
Interstitial Free ◽  
Great Role ◽  
Hardening Rule ◽  
Tailor Welded Blanks ◽  
Longitudinal Welds

Nowadays, tailor welded blanks (TWBs) have a great role to play in saving of cost, vehicle weight, and fuel consumption in automobile industries. A TWB constitutes blanks with different thicknesses and/or coatings and/or mechanical properties welded together prior to the stamping process. Owing to low formability of TWBs, determining and predicting the forming limit diagram (FLD) of these blanks enables manufacturers to produce non-imperfection parts. In this research, a modified type of Marciniak–Kuczynski (M–K) model was applied to determine the FLD of a TWB consisting of interstitial free (IF) galvanized steel sheet with different thicknesses (0.8 and 1.2 mm). Also, the effect of three yield criteria, namely Hill48, Hosford79, and BBC2002, on the predicted FLDs was investigated. During the analyses, the materials were assumed to follow the Hollomon work hardening rule. The experimental FLDs were determined utilizing the Hecker method. It was observed that the proposed method can properly predict the experimental FLD of a TWB with longitudinal welds and thickness ratios (TRs) greater than one, if proper parameters are being selected. Furthermore, the best prediction took place when the BBC2002 yield criterion was applied.

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