The forming limit curve for multiphase advanced high strength steels based on crystal plasticity finite element modeling

Mohammed, Bassam; Park, Taejoon; Kim, Hyunki; Pourboghrat, Farhang; Esmaeilpour, Rasoul

doi:10.1016/j.msea.2018.04.029

Cited by 35 publications

(10 citation statements)

References 56 publications

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“…It should be noted that for the calibration of Hill's 1948 yield function, the material parameters for out of plane stress components were assumed to be same as the isotropic von Mises yield function, i.e. L = M = 1.5 [15,16]. In addition, the anisotropy coefficients of Yld2000-2D were calibrated using the normalized yield stress values (i.e.…”

Section: Hill's 48 and Yld2000-2d Anisotropy Coefficientsmentioning

confidence: 99%

Stamping of a cross-shaped part with 5052, 5754 and 6016 aluminum alloy sheets – experimental and finite element analysis comparison

Esmaeilpour¹,

Tiji²,

Kim³

et al. 2018

EasyChair Preprints

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The application of aluminum alloys is continuing to increase in automotive and aerospace industries. In this study, the stamping of a cross-shaped part, representing typical deep drawn automotive parts, was attempted with three different types of aluminum alloy sheets. To characterize the anisotropic properties of the material, uniaxial tensile tests were performed with ASTM standard dog-bone specimens cut from AA5052, AA5754 and AA6016 T4 alloy sheets. The stamping of the cross-shaped parts was conducted using a high capacity servo press with a servo-cushion system. Deformation strains developing in stamped parts were measured with the ARGUS system for comparison with finite element simulation results. Formed parts were also cut in two different directions using a water-jet machine, and thickness variations along the length of the cut section were measured. The measured surface strains and thickness distributions were compared with finite element simulations results obtained with LS-Dyna explicit code using the Yld2000-2D and Hill's 48 yield functions. Overall, experimental and numerical results correlated well, especially with the Yld2000-2D yield function, implying that this yield function is well suited for the modeling of the complex cross-shaped parts with aluminum alloys.

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Section: Hill's 48 and Yld2000-2d Anisotropy Coefficientsmentioning

confidence: 99%

Stamping of a cross-shaped part with 5052, 5754 and 6016 aluminum alloy sheets – experimental and finite element analysis comparison

Esmaeilpour¹,

Tiji²,

Kim³

et al. 2018

EasyChair Preprints

Self Cite

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show abstract

“…As for the group of the full field model, it has been so far exclusively based on crystal plasticity finite element method in 2D [61,62,63] and 3D [64,65,66], and applying full field crystal plasticity models for FLD prediction deserves some discussion.…”

Section: Full Field Modelsmentioning

confidence: 99%

“…To avoid the above issues in 2D models, it is more appropriate to use 3D models with proper boundary conditions to fulfill the macroscopic plane stress condition. In the previous studies with 3D models [64,65,66], full field crystal plasticity 3D models are all coupled with the MK-model, i.e. introducing a geometrical imperfection in a finite element method mesh.…”

Section: Full Field Modelsmentioning

confidence: 99%

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Assessment of full field crystal plasticity finite element method for forming limit diagram prediction

Ma¹

2018

Preprint

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This study is inspired by the recent development of "virtual material testing laboratory" in which the main equipment is a full field crystal plasticity modeling tool. Ample examples have demonstrated its applications to sheet forming operations. In those applications, the mechanical anisotropy originated from the crystallographic texture can be adequately described, such as r-values and earing. Formability is another important property in sheet metal forming, which has yet not been equipped in these virtual laboratories. Though theoretical models for formability can be dated back to 1885 due to Considère, all popular models at the moment suffer from their respective limitations. In this study, we explore the feasibility of applying full field crystal plasticity model for calculating forming limit diagram, avoiding using additional assumptions or models for determining the forming limits.

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“…During the forming process, fracture occurs when the minor and major strain points of the sheet metal are above the FLC. As FLC is widely used to accurately predict the forming limit, great attention has been paid to it [5,6].…”

Section: Introductionmentioning

confidence: 99%

A Modified M-K Method for Accurate Prediction of FLC of Aluminum Alloy

Chen

Lang

2021

Metals

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Forming limit curve (FLC) is an important failure criterion for sheet metals in sheet metal forming, while the M-K model is widely used for the prediction of the FLC. In the M-K model, such prediction is greatly influenced by the initial thickness imperfection factor and material properties, from which the original M-K model’s theoretical derivation is proposed as a solution to the above mentioned issue in this paper. Then the relationship between the M-K model and Keeler’s empirical formula is then studied, from which a new method to predict FLC is proposed that combines the M-K model with Keeler’s empirical formula according to the previous analyses. It turns out that this new method can simplify the calculation procedure. Finally, the experimental results of two kinds of aluminum alloys, AA6016 and AA5182, have verified the effectiveness of the proposed method.

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The forming limit curve for multiphase advanced high strength steels based on crystal plasticity finite element modeling

Cited by 35 publications

References 56 publications

Stamping of a cross-shaped part with 5052, 5754 and 6016 aluminum alloy sheets – experimental and finite element analysis comparison

Stamping of a cross-shaped part with 5052, 5754 and 6016 aluminum alloy sheets – experimental and finite element analysis comparison

Assessment of full field crystal plasticity finite element method for forming limit diagram prediction

A Modified M-K Method for Accurate Prediction of FLC of Aluminum Alloy

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