Determining Forming Limit Diagrams Using Sub-Sized Specimen Geometry and Comparing FLD Evaluation Methods

Rubešová, Kateřina; Rund, Martin; Rzepa, Sylwia; Jirková, Hana; Jeníček, Štěpán; Urbánek, Miroslav; Kučerová, Ludmila; Konopík, Pavel

doi:10.3390/met11030484

Cited by 8 publications

(2 citation statements)

References 21 publications

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“…Good lubrication results in flow localization occurring near the pole, whereas in the case of poor lubrication, flow localization occurs near the flange. Rubesˇova´et al 4 targeted the results obtained from sub-size specimens and compared the FLC of these specimens with that of standard specimens. They found that good accordance was achieved between the FLC of sub-sized and standard specimens.…”

Section: Introductionmentioning

confidence: 99%

Generalized phenomenological model to analyze the forming limit curve of Al 1050

Anbaran

Lotfabad

Ebrahimi

et al. 2023

The Journal of Strain Analysis for Engineering Design

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In this investigation, the previously proposed phenomenological model in the literature is generalized both in terms of the mathematical form of the model and the yield function used to describe the plasticity of the material. Al 1050 is chosen as the model material, where the sheets made from this material are first annealed and then subjected to a tensile test and Erichsen cupping test to obtain tensile properties as well as the FLC of the material. The constants of the generalized model are first obtained by curve fitting, whereby in this approach least overall error is expected as a single equation is used to predict the FLC of material. Further, it is shown that it would be possible to enhance the accuracy of the model at the cost of losing the applicability of a single mathematical expression for both branches of FLC. In this approach, the generalized model would be calibrated for the right branch based on Swift’s model and for the left branch based on Hill’s model. Finally, the effect of the yield criterion used to describe the plasticity of the material on the predictions of the generalized model is investigated, and it is shown that using the Hosford yield criterion yields better results compared to using the von Mises yield criterion.

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Section: Introductionmentioning

confidence: 99%

Generalized phenomenological model to analyze the forming limit curve of Al 1050

Anbaran

Lotfabad

Ebrahimi

et al. 2023

The Journal of Strain Analysis for Engineering Design

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“…In all forming operations using sheet metal as an input material, it is critical to understand the conditions that cause necking (instability of material) or fracture. Such limits can be represented as a forming limit diagram (FLD) shown in Figure 2, which plots the curve of major and minor strain coordinates [11]. The strain in the direction of the maximum strain is defined as the major strain.…”

Section: Introductionmentioning

confidence: 99%

Studies on Finite Element Analysis in Hydroforming of Nimonic 90 Sheet

Chinnaiyan

2023

Mathematics

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The primary goal of this study was to investigate the formability of Nimonic 90 sheet which performs well at high temperatures and pressures, making it ideal for applications in the aerospace, processing, and manufacturing industries. In this present study, finite element analysis (FEA) and optimization of process parameters for formability of Nimonic 90 in sheet hydroforming were investigated. The material’s mechanical properties were obtained by uniaxial tensile tests as per the standard ASTM E8/E8M. The sheet hydroforming process was first simulated to obtain maximum pressure (53.46 MPa) using the FEA and was then validated using an experiment. The maximum pressure obtained was 50.5 MPa in experimentation. Since fully experimental or simulation designs are impractical, the Box–Behnken design (BBD) was used to investigate various process parameters. Formability was measured by the forming limit diagram (FLD) and maximum deformation achieved without failure. Analysis of variance (ANOVA) results also revealed that pressure and thickness were the most effective parameters for achieving maximum deformation without failure. Response surface methodology (RSM) optimizer was used to predict optimized process parameter to achieve maximized response (deformation) without failure. Experimental validation was carried out for the optimized parameters. The percentage of error between experimental and simulation results for maximum deformation was less than 5%. The findings revealed that all the aspects in the presented regression model and FEM simulation were effective on response values.

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Experimental investigation to determine necking of commercially pure titanium sheets using a time-of-flight camera and Heaviside-digital image correlation

Jedidi

Valle

2023

Optics and Lasers in Engineering

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Determining Forming Limit Diagrams Using Sub-Sized Specimen Geometry and Comparing FLD Evaluation Methods

Cited by 8 publications

References 21 publications

Generalized phenomenological model to analyze the forming limit curve of Al 1050

Generalized phenomenological model to analyze the forming limit curve of Al 1050

Studies on Finite Element Analysis in Hydroforming of Nimonic 90 Sheet

Experimental investigation to determine necking of commercially pure titanium sheets using a time-of-flight camera and Heaviside-digital image correlation

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