On the use of effective limit strains to evaluate the forming severity of sheet metal parts after nonlinear loading

Nurcheshmeh, Morteza; Green, Daniel E.

doi:10.1007/s12289-012-1104-9

Cited by 5 publications

(3 citation statements)

References 25 publications

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“…However, as there is only one tested data in the left side of FLD, it is difficult to say which model is more applicable for formability prediction of the studied steel. As suggested in [15] the effective strain related FLD (shown in Figure 3 (b)) is less strain path dependent than the traditional FLD in major strain-minor strain space (shown in Figure 3 (a)), the effective related FLD is more suitable for practical forming process. As there is obvious difference of the theoretical FLD models on the left side, more testing data are needed to make better comparison and evaluation of the different theoretical models.…”

Section: Numiform 2016mentioning

confidence: 87%

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Determination of instability of a DP 980 steel sheet under different stress states based on experiment and theoretical models

et al. 2016

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Abstract. It is generally accepted that the formability of sheet metal is limited by the onset of instability which can be described by forming limit diagram (FLD) in ε1-ε2 space. Common tests for FLD data usually cover strain ratio range from uniaxial to equal biaxial stretching, −1/2 ≤ ε2/ε1 ≤ 1. In this paper a new design of cruciform type specimen for uniaxial stretching is proposed to test formability with strain ratios in the range from shear to tension, −1 ≤ ε2/ε1 ≤ -1/2 which can be controlled by the geometry parameters. The forming limit of a DP 980 steel sheet was determined using both conventional method and proposed specimen with strain ratios from −1 ≤ ε2/ε1 ≤ 1. Then the experimental results were drawn in both ε1-ε2 and εeq-σm/σeq spaces, and the predicted results based on Hill, Swift, M-K, and Hora instability models were compared with the experimental ones. The formability features of the studied steel in whole strain ratio range and differences among the investigated theoretical models were finally discussed. The results indicate that the M-K instability model shows better prediction of the studied steel compared to the other models investigated in this research.

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Section: Numiform 2016mentioning

confidence: 87%

“…A Von Mises isotropic yield function and a Swift power law hardening equation were used. For M-K model, the initial imperfection parameter f 0 is fixed to 0.995 calculated by surface roughness of the delivered sheets using methods proposed in [15]. 68003007…”

Section: Fld Obtained By Standard Nakajima Testing and Comparison Witmentioning

confidence: 99%

Determination of instability of a DP 980 steel sheet under different stress states based on experiment and theoretical models

et al. 2016

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“…The forming process will be safe if all the measured effective strains are located under the extended strain-based FLD. (e.g., see [23,24]). Figure 6 compares necking positions or failure locations for a two-layer metallic blank with 63.38mm diameter determined by experiment and FE simulations.…”

Section: A Statistical Forming Limit Diagrammentioning

confidence: 99%

Numerical and experimental study of formability in deep drawing of two-layer metallic sheets

Karajibani

Fazli

Hashemi

2015

Int J Adv Manuf Technol

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In this paper, the formability of two-layer (aluminum-st12 steel) sheets in the deep drawing process was investigated through numerical simulations and experiments. The purpose of this research was to obtain more formability in deep drawing process. The limit drawing ratio (LDR) was obtained in deep drawing of two-layer metallic sheets, with aluminum inner layer which was in contact with the punch and steel outer layer which was in contact with the die. Finite element simulations were performed to study the effect of parameters such as the thickness of each layer, value of die arc radius, friction coefficient between blank and punch, friction coefficient between blank and die, and lay-up on the LDR. Experiments were conducted to verify the finite element simulations. The results indicated that the LDR was dependent on the mentioned parameters, so the LDR and as a result the two-layer metallic sheet formability could be increased by improvement of these parameters in deep drawing process.

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Formability analysis of hot-rolled dual-phase steel during the multistage stamping process of wheel disc

Chen

Song

Lăzărescu

et al. 2020

Int J Adv Manuf Technol

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On the use of effective limit strains to evaluate the forming severity of sheet metal parts after nonlinear loading

Cited by 5 publications

References 25 publications

Determination of instability of a DP 980 steel sheet under different stress states based on experiment and theoretical models

Determination of instability of a DP 980 steel sheet under different stress states based on experiment and theoretical models

Numerical and experimental study of formability in deep drawing of two-layer metallic sheets

Formability analysis of hot-rolled dual-phase steel during the multistage stamping process of wheel disc

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