Determination of Forming Limit Diagrams Based on Ductile Damage Models and Necking Criteria

Chalal, Hocine; Abed‐Meraim, Farid

doi:10.1590/1679-78253481

Cited by 14 publications

(4 citation statements)

References 40 publications

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“…Chalal and Abed-Meraim [21], who applied four necking criteria in the Nakajima test, verified that numerical simulation FLDs predicted by local criteria were in good agreement with the experimental results. By contrast, the global criterion based on the maximum punch force on the left side of the FLD seemed not to be suitable for the prediction of local necking.…”

Section: Introductionsupporting

confidence: 57%

Comparative Investigation of the Experimental Determination of AA5086 FLCs under Different Necking Criteria

Kong

Chu

Chen³

et al. 2021

Materials

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The construction of a forming limit diagram (FLD) is a conventional approach to obtain limit strains and to evaluate the formability of sheet metal. Appropriate necking criteria should be applied to determine the forming limit curve (FLC) accurately. In recent years, deep research on the determination of the FLC has been carried out; meanwhile, several necking criteria have been proposed. However, the application of inappropriate necking criteria would cause deviations when determining FLCs. In this study, both Marciniak and Nakajima tests were carried out on the AA5086 aluminum sheet to make a comparative investigation of different necking criteria in the determination of FLCs. In the Marciniak test, four existing necking criteria were chosen to construct FLCs, and analyzed in detail. The well-performed time dependent and position dependent methods were selected for the Nakajima test. Meanwhile, the modified Wang method based on the height change of the adjacent points was proposed. The comparative results showed that the time and position dependent methods were relatively conservative in both experiments, while the modified Wang method could identify the onset of localized necking more accurately.

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Section: Introductionsupporting

confidence: 57%

Comparative Investigation of the Experimental Determination of AA5086 FLCs under Different Necking Criteria

Kong

Chu

Chen³

et al. 2021

Materials

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“…To evaluate the tube end closing process, a failure criterion should be clearly defined. The variation of the state of stress makes it insufficient to depend on only one failure criterion [15]. Instead, the FLD, which is mainly a plot of the minor and major true strains, is employed as shown in the graph in Figure 10.…”

Section: Forming Limit Diagram (Fld)mentioning

confidence: 99%

Optimization of AL6061-T6 Tube End Forming Process Using Response Surface Method

Shaaban

Elsabbagh

2021

Modelling and Simulation in Engineering

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Tube end closing is a metal forming process that replaces welding processes while closing tubes ends. It depends on deforming a rotating tube using a roller, and therefore, it is also called tube end spinning. The process involves many parameters like contact depth, roller inclination angle, roller diameter, mandrel curvature, and tube rotational speed. This study develops a finite element model (FE-model) for this process and validates it through experimental results. The numerical and experimental results have shown minor deviation of 1.87%. The FE-model is then employed to carry out a statistical analysis based on the response surface method (RSM). The analysis of variance (ANOVA) and regression analysis have proved the accuracy of the obtained mathematical model. The contact depth has proved to have the most significant effect in the process responses, while the roller diameter has the least effect. Finally, an optimization analysis is carried out to select the finest conditions for the process.

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“…24 Based on physical features of the microstructure, a hybrid composite medium-field (Hy-MFC) model was developed to predict the tensile properties of dual-phase steels under monotonic loading. 25 While considering the studies in the literature, it was observed that the mechanical properties of some DP steels have been investigated by other models, [26][27][28][29][30][31][32][33] and that is no study on triaxiality and strain rate behaviour of the DP600 and DP800 using specifically the Mat_Picewise_Linear_ Plasticity_024 model, which is found in LS-Dyna software, from where an elasto-plastic material with an arbitrary stress versus strain curve and arbitrary strain rate dependency can be defined. In addition, it can be defined that failure is based on plastic strain.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behaviour of Dual Phase Steels under Different Strain Rates

Topilla

Toros

2023

Kemija U Industriji

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The objective of this research was to analyse the stress and strain behaviours of the triaxiality specimens (specimens of different shaping) of dual-phase steels, respectively DP600 and DP800, whose microstructures mainly comprise ferrite and martensite phases. These steels find wide application in the automotive industry, which is constantly searching for better quality materials in the aim of increasing vehicle safety, protecting the environment, and reducing fuel consumption. In this case, for all tested specimens the experimental uniaxial tensile tests were performed at three different strain rates, 0.0083 s −1 , 0.042 s −1 , and 0.16 s −1 , to determine mechanical properties such as stress, strain, yield strength, and ultimate tensile strength of mentioned steels. In addition, uniaxial tensile tests with characteristics similar to those experimental were carried out through the finite element modelling method using the Mat_Picewise_Linear_Plasticity_024 model, to determine the mentioned mechanical properties, but also to determine the failure parameters or plastic strain up to failure, of all triaxiality modelled specimens. The obtained results were validated by comparing the experimental results with numerical simulation results. The comparative scale of accuracy between both steels was made at the fracture strain, and the average accuracy of both steels for the standard (s) specimens was < 1 %, for the (20a) specimens 1.50 %, for the (4a) specimens 4 %, and for (a) specimens 3.50 %. Finally, it was concluded that the proposed material model and calibrated failure data fitted very well.

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Determination of Forming Limit Diagrams Based on Ductile Damage Models and Necking Criteria

Cited by 14 publications

References 40 publications

Comparative Investigation of the Experimental Determination of AA5086 FLCs under Different Necking Criteria

Comparative Investigation of the Experimental Determination of AA5086 FLCs under Different Necking Criteria

Optimization of AL6061-T6 Tube End Forming Process Using Response Surface Method

Mechanical Behaviour of Dual Phase Steels under Different Strain Rates

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