Investigation on forming limit properties of dual phase steel

2013 ◽  
Author(s):  
Libo Pan ◽  
Bernard Rolfe ◽  
Alireza Asgari ◽  
Matthias Weiss ◽  
Zhijian Zhang
Keyword(s):  
Dual Phase Steel ◽  
Forming Limit ◽  
Dual Phase

Application of Barlat Yld-96 Yield Criterion for Predicting Formability of Pre-Strained Dual Phase Steel Sheets

2016 ◽  
Author(s):  
Shamik Basak ◽  
Sushanta Kumar Panda
Keyword(s):  
Dual Phase Steel ◽  
Yield Criterion ◽  
Thin Sheet ◽  
Damage Model ◽  
Forming Limit Diagram ◽  
Plasticity Theory ◽  
Forming Limit ◽  
Dual Phase ◽  
Strain Paths ◽  
Anisotropy Coefficients

The selection of advanced material model considering the anisotropy mechanical properties of the thin sheet is vital in order to estimate stress based forming limit diagram (σ-FLD). In present study associative plasticity theory was applied indulging Barlat Yld-96 anisotropy yield function and the Swift hardening law was implemented for estimating the limiting stresses from the conventional strain FLD (ε-FLD) of an automotive grade dual phase steel DP600. Three different approaches were made to evaluate Yld-96 anisotropy coefficients using experimental results of stack compression and tensile tests. To impose complex strain path, two stage stretch forming processes were simulated in finite element solver LS-DYNA. After biaxial pre-straining, the sample geometries were varied to achieve different strain paths during the second stage of deformation. The results indicated that there was negligible difference in limiting stress estimated by Yld-96 plasticity theory when the anisotropy coefficients were calculated based on plastic strain at ultimate tensile strength compare to that by minimum plastic work method. It was concluded that the dynamic shift of ε-FLD could be restricted by σ-FLD estimated using Yld 96 plasticity theory, and hence it was proposed to be a suitable damage model to evaluate formability of pre-strained DP600 steels.

Experimental Researches on Nonlinear Strain Paths Forming for Dual Phase Steel

2014 ◽  
Vol 1004-1005 ◽  
pp. 209-213
Author(s):  
Li Bo Pan ◽  
Hong Chuan Zhu ◽  
Ze Hong Lei ◽  
Zhi Jian Zhang
Keyword(s):  
Plastic Strain ◽  
Dual Phase Steel ◽  
Forming Limit Diagram ◽  
Forming Limit ◽  
Strain Diagram ◽  
Dual Phase ◽  
Effective Plastic Strain ◽  
Nonlinear Strain ◽  
Precise Tool ◽  
Strain Paths

Strain paths during sheet metal forming are always complex and nonlinear. Forming limit diagram (FLD) is a common method to determine failure in the past decades. However, it is only suitable for linear strain path condition. Regarding dual phase steel DP780, a special experiment was designed and carried out on Zwick Cupping equipment to get nonlinear strain paths. And the strain status was analyzed in FLD. It was found that FLD cannot predict failure precisely in this case. A new approach proposed by Stoughton and Yoon which based on polar effective plastic strain was introduced to analyze this nonlinear strain paths condition, the result is in good agreement with experiment, which indicated that Polar Effective Plastic Strain Diagram was an effective and precise tool to determine failure especially for complex nonlinear strain paths forming.

Fatigue characteristics of fine grain dual-phase steel.

1988 ◽  
Vol 37 (417) ◽  
pp. 637-642
Author(s):  
Shigeru YAMAMOTO ◽  
Hideaki NAKAYAMA ◽  
Tsuneshichi TANAKA
Keyword(s):  
Dual Phase Steel ◽  
Dual Phase ◽  
Fine Grain ◽  
Fatigue Characteristics

Effect of gas nitriding in flowing ammonia on the hot-dip galvanising of the Dual-Phase steel DP500

2005 ◽  
Vol 96 (3) ◽  
pp. 233-241 ◽  
Author(s):  
A. Dimyati ◽  
D. Beste ◽  
T. E. Weirich ◽  
S. Richter ◽  
M. Bückins ◽  
...  
Keyword(s):  
Dual Phase Steel ◽  
Dual Phase ◽  
Gas Nitriding
Sign in / Sign up

Export Citation Format

Share Document