Forming Limit Prediction of Sheet Metals Subjected to Combined Loading Using Forming Limit Stress Curve

2011 ◽  
Author(s):  
Fuminori Sugawara ◽  
Kengo Yoshida ◽  
Toshihiko Kuwabara ◽  
Naoki Taomoto ◽  
Naoki Yanagi ◽  
...  
Keyword(s):  
Combined Loading ◽  
Forming Limit ◽  
Sheet Metals ◽  
Stress Curve ◽  
Limit Stress

scholarly journals Study of prestrain influence for the prediction of the necking occurrence

1999 ◽  
Vol 21 (1) ◽  
pp. 57-64
Author(s):  
Nguyen Nhat Thang
Keyword(s):  
Mild Steel ◽  
Steel Sheet ◽  
Mechanical Characteristics ◽  
Experimental Results ◽  
Forming Limit ◽  
Stress Diagram ◽  
Stress Curve ◽  
Limit Stress

This paper contains experimental results for mechanical characteristics of a mild steel sheet. The determination of the forming limit stress curve for solicitation along two direction is drawn. Study of pestraint influence from the limit stress diagram is presented.

Fracture Prediction for Sheet Metals Subjected to Draw-Bending Using Forming Limit Stress Criterion

2013 ◽  
Author(s):  
Masazumi Saito ◽  
Toshihiko Kuwabara
Keyword(s):  
Sheet Metal ◽  
Steel Sheet ◽  
Fracture Criterion ◽  
Test Material ◽  
Forming Limit ◽  
Sheet Metals ◽  
Cross Sectional ◽  
Stress Criterion ◽  
Limit Stress ◽  
Draw Bending

Draw-bending is one of the typical deformation modes in sheet metal forming. It causes serious thickness reduction to sheet metals and very often leads to fracture. Therefore, it is crucial to establish a fracture criterion for sheet metals subjected to draw-bending. In this study, a fracture criterion for sheet metals subjected to draw-bending is investigated using the concept of the forming limit stress criterion. The test material used is a dual phase steel sheet (DP590Y) with a thickness of 1.2 mm and a tensile strength of 590 MPa. Draw-bending experiments of a wide specimen are performed using three different die profile radii: 4, 6 and 10 mm. The forming limit stress of the test material under draw-bending, σDB, is precisely determined from the experimentally measured drawing force and the cross sectional area of the specimen, determined from the strain distribution in the vicinity of fracture using a 2 mm square grid. In addition, multiaxial tube expansion tests are performed to measure the forming limit stress under plane strain tension, σPT. It is found that σDB almost coincides with σPT. Thus, it is concluded that σPT can be a fracture criterion for a sheet metal under draw-bending, at least for the high strength steel sheet used in this study.

Determination of the Forming Limit Stress Curve for Anisotropic Sheets

CIRP Annals ◽  
1987 ◽  
Vol 36 (1) ◽  
pp. 195-198 ◽  
Author(s):  
R. Arrieux ◽  
M. Boivin ◽  
F. Le Maître
Keyword(s):  
Forming Limit ◽  
Stress Curve ◽  
Limit Stress

Determination of the Strain Path Influence of the Forming Limit Diagrams, from the Limit Stress Curve

CIRP Annals ◽  
1985 ◽  
Vol 34 (1) ◽  
pp. 205-208 ◽  
Author(s):  
R. Arrieux ◽  
C. Bédrin ◽  
M. Boivin ◽  
F. Le Maître
Keyword(s):  
Strain Path ◽  
Forming Limit ◽  
Forming Limit Diagrams ◽  
Stress Curve ◽  
Limit Stress
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