scholarly journals Modified maximum force criterion, a model for the theoretical prediction of forming limit curves

2011 ◽  
Vol 6 (2) ◽  
pp. 267-279 ◽  
Author(s):  
P. Hora ◽  
L. Tong ◽  
B. Berisha
Keyword(s):  
Theoretical Prediction ◽  
Maximum Force ◽  
Forming Limit ◽  
Criterion A ◽  
Force Criterion ◽  
Forming Limit Curves

Predictive Performances of FLC Using Marciniak-Kuczynski Model and Modified Maximum Force Criterion

2015 ◽  
Vol 651-653 ◽  
pp. 96-101 ◽  
Author(s):  
Dorel Banabic ◽  
Lucian Lazarescu ◽  
Dan Sorin Comsa
Keyword(s):  
Theoretical Models ◽  
Alloy Sheet ◽  
Maximum Force ◽  
Forming Limit ◽  
Forming Limit Curve ◽  
Experimental Procedure ◽  
Force Criterion ◽  
Yield Functions ◽  
Theoretical Predictions ◽  
The Hill

This paper is focused on the performance evaluation of two theoretical models that can be used to predict the Forming Limit Curve (FLC) for an AA6016-T4 aluminium alloy sheet. The FLC is calculated based on the Marciniak-Kuczynski (M-K) model and the Modified Maximum Force Criterion (MMFC) using the Hill '48, Barlat '89 and BBC 2005 yield criteria, the latter identified in three variants, namely with 6, 7, and 8 material parameters. The performance assessment of the M-K and MMFC models combined with different yield functions is based on the comparison between the theoretical predictions and the experimental data provided by the Nakazima test (ISO 12004: 2008) as well as by an experimental procedure recently developed by the authors for the FLC determination.

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.

Effect of the Constitutive Law on the Accuracy of Prediction of the Forming Limit Curves

2012 ◽  
Vol 504-506 ◽  
pp. 77-82 ◽  
Author(s):  
Liana Paraianu ◽  
Dan Sorin Comsa ◽  
Ioan Pavel Nicodim ◽  
Ioan Ciobanu ◽  
Dorel Banabic
Keyword(s):  
Sheet Metal ◽  
Mechanical Response ◽  
Yield Criterion ◽  
Plastic Anisotropy ◽  
Equivalent Stress ◽  
Point Of View ◽  
Constitutive Law ◽  
Forming Limit ◽  
Accuracy Of Prediction ◽  
Forming Limit Curves

The accuracy of the forming limit curves predicted by the Marciniak-Kuczynski model depends on the type and flexibility of the constitutive equations used to describe the mechanical response of the sheet metal. From this point of view, the yield criterion has the most significant influence. The paper presents a comparative analysis referring to the quality of the forming limit curves predicted by the Marciniak-Kuczynski model for the case when the plastic anisotropy of a DC04 sheet metal is described by the BBC2005 yield criterion. The coefficients included in the expression of the BBC2005 equivalent stress are evaluated using different identification strategies (with 4, 6, 7, and 8 mechanical parameters). The forming limit curves predicted by the Marciniak-Kuczynski model in each of the cases previously mentioned are compared with experimental data.

Forming Limits Under Stretch-Bending Through Distortionless and Distortional Anisotropic Hardening

2018 ◽  
Vol 140 (12) ◽  
Author(s):  
Ji He ◽  
Bin Gu ◽  
Yongfeng Li ◽  
Shuhui Li
Keyword(s):  
Detailed Comparison ◽  
Forming Limit ◽  
Anisotropic Hardening ◽  
Hardening Model ◽  
Stretch Bending ◽  
Bending Process ◽  
Hardening Models ◽  
Out Of Plane ◽  
Forming Limit Curves ◽  
Insight Into

The necking behavior of sheet metals under stretch-bending process is a challenge for the forming limit prediction. State-of-the-art forming limit curves (FLCs) allow the prediction under the in-plane stretching but fall short in the case under out-of-plane loading condition. To account for the bending and straightening deformation when sheet metal enters a die cavity or slide along a radius, anisotropic hardening model is essential to reflect the nonproportional loading effect on stress evolution. This paper aims to revisit the M-K analysis under the stretch-bending condition and extend it to accommodate both distortionless and distortional anisotropic hardening behavior. Furthermore, hardening models are calibrated based on the same material response. Then the detailed comparison is proposed for providing better insight into the numerical prediction and necking behavior. Finally, the evolution of the yield surface and stress transition states is examined. It is found that the forming limit prediction under stretch-bending condition through the M-K analysis strongly depends on the employed anisotropic hardening model.

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