Advanced Models for the Prediction of Forming Limit Curves

Banabic, Dorel; Comşa, Dan Sorin; Eyckens, Philip; Kami, Abdolvahed; Gologanu, Mihai

doi:10.1007/978-3-319-44070-5_5

Cited by 9 publications

(6 citation statements)

References 149 publications

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“…The stress triaxiality is one of the primary factors that influence the coalescence of voids [22]. Furthermore, the triaxiality of the stress state is known to considerably affect the amount of plastic strain which a material may undergo before ductile failure occurs [23].…”

Section: Effects Of Triaxiality Stress On the Three-layer Sheetmentioning

confidence: 99%

Experimental and numerical evaluation of formability in three-layer metallic sheets with various layer arrangements

2022

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Multi-layer metallic sheets are composed of two or more metallic layers connected to each other to achieve desirable features based on the various properties of the constituent layers. This study attempted to predict the forming limits and deformation behavior of three-layer metallic sheets. Additionally, the effects of the layer arrangement on the forming limit diagram (FLD), stress triaxiality, and limiting dome height (LDH) were investigated using a finite element numerical approach. To this end, three-layer metallic sheets made of aluminum (AA3004), stainless steel (SUS304), and copper (Cu1011) bonded by polyurethane as the bonding layer were employed. The numerical results were validated using the experimental results of Nakajima stretch-forming tests. The numerical results were in good agreement with the experimental data. The results indicate that the formability of the three-layer sheet increased by placing the AA3105 layer as the inner layer in contact with the punch, the Cu1011 layer in the middle, and the SUS304 layer as the outer layer. Therefore, the formability of the Al-Cu-SUS sheet was higher than that of the other layer arrangements. Moreover, the results show that the material properties, particularly the tensile strength, play a key role in controlling the FLD of the three-layer sheets.

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Section: Effects Of Triaxiality Stress On the Three-layer Sheetmentioning

confidence: 99%

Experimental and numerical evaluation of formability in three-layer metallic sheets with various layer arrangements

2022

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“…the region inside the band and the region outside the band. During deformation, two conditions are to be fulfilled [32]: (i) the continuity of the strain rate along the band; (ii) the mechanical equilibrium on the interface between the above mentioned two regions.…”

Section: Marciniak-kuczyński Model (Mk-model)mentioning

confidence: 99%

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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“…In order to accurately predict the forming limit, the M-K model can be combined with a ductile fracture criterion (DFC), for example, the well-known Gurson model and Gurson–Tvergaard–Needleman model [ 29 , 30 , 31 ]. This type of M-K+DFC model has been discussed briefly in the reviews of Banabic et al [ 25 , 32 ] and Zhang et al [ 33 ]. However, the computational cost of a combination of the M-K model and a physical DFC is much more expensive than the traditional M-K model [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

Forming Limit Analysis of Thin-Walled Extruded Aluminum Alloy Tubes under Nonlinear Loading Paths Using an Improved M-K Model

et al. 2023

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To meet the requirement of lighter weight and better performance in tube hydroforming, one of the most important tasks is to accurately predict the forming limit of thin-walled tubes under nonlinear loading paths. This work established the M-K+DF2012 model, a combination of the M-K model and the DF2012 ductile fracture criterion, for the forming limit prediction of thin-walled tubes under nonlinear loading paths. In this model, the failure of the groove is determined by the DF2012 criterion, and the corresponding strains in the uniform region are the limit strains. The limit strains of an AA6061 aluminum alloy tube under a set of linear loading paths and two typical nonlinear loading paths were tested. Parameter values of the M-K+DF2012 model for the tube were determined based on the experimental limit strains under linear loading paths, and the limit strains under the two nonlinear loading paths were predicted. Then the strain-based forming limit diagram (ε-FLD) and the polar effective plastic strain FLD (PEPS-FLD) of the tube under different pre-strains were predicted and discussed. The results show that the limit strains of the tube are obviously path-dependent, and the M-K+DF2012 model can reasonably capture the limit strains of the tube under both linear and nonlinear loading paths. The predicted ε-FLD shows a strong dependence on the pre-strain, while the predicted PEPS-FLD is weakly strain path-dependent and almost path-independent on the right-hand side for the AA6061 tube.

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Advanced Models for the Prediction of Forming Limit Curves

Cited by 9 publications

References 149 publications

Experimental and numerical evaluation of formability in three-layer metallic sheets with various layer arrangements

Experimental and numerical evaluation of formability in three-layer metallic sheets with various layer arrangements

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

Forming Limit Analysis of Thin-Walled Extruded Aluminum Alloy Tubes under Nonlinear Loading Paths Using an Improved M-K Model

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