Effect of reverse dome stretching on dome height and forming limits of sheet materials

Jain, Mukesh; Allin, J.; Duan, Xinjian; Lloyd, D. J.

doi:10.1016/j.msea.2004.08.038

Cited by 9 publications

(5 citation statements)

References 10 publications

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“…The formability of material under strain reverse condition would be better than linear strain path conditions. This phenomenon is the same as that of reversed LDH tests given by Jain et al 11…”

Section: Resultssupporting

confidence: 86%

“…This phenomenon is the same as that of reversed LDH tests given by Jain et al 11 To conclude, predictions made by linear FLC would be underestimated or overestimated under two-step strain path conditions. The FLC would shift upward or downward when prestrain effect exists in the forming processes, just like the experimental results showed by Jain et al 11 If a sheet metal is deformed through a two-step strain path, using a linear FLC for fracture prediction could cause problems such as unexpected occurrence of fracture. For process and product design purpose, the forming limits under two-step strain path conditions determined by experiments are still required.…”

Section: Discussionsupporting

confidence: 81%

“…Jain et al 11 completed a series of tests on AA5754-O with the specimens first underwent LDH test and then deformed with reverse dome stretching. It is believed that the FLC of two-step forming limit diagram (FLD) should be different from linear strain path FLD.…”

Section: Introductionmentioning

confidence: 99%

“…Another important fact is that the strain paths in original LDH tests were all linear, and the prestrain effects were not considered when establishing FLC by the original LDH test method. Jain et al 11 completed a series of tests on AA5754-O with the specimens first underwent LDH test and then deformed with reverse dome stretching. It is believed that the FLC of two-step forming limit diagram (FLD) should be different from linear strain path FLD.…”

Section: Introductionmentioning

confidence: 99%

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Formability evaluation by novel specimen designs in sheet metal forming with two-step strain paths

Chen

Lee

Gau

2012

Proceedings of the Institution of Mechanical Engineers, Part B:

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Limit dome height test is commonly used for evaluating the formability of sheet material. Through altering the geometry of specimens, different strain paths could be obtained to establish forming limit diagram of the material. By incorporating finite element analysis with ductile energy criteria, engineers can also predict the formability of material. The forming limit diagram or constants in ductile energy criteria are usually determined by experiments with linear strain path. However, the predictions may lose their accuracy when evaluating products with complex strain paths, which is commonly seen in sheet forming processes. Therefore, a better method for evaluating formability of material under complex strain path should be developed. In this study, novel specimen designs for limit dome height test are applied to generate different strain paths with two-step strain effect on the specimens. Different geometric parameters of the novel specimen design can alter the slope of strain paths and create different strain paths similar to the two-step deformation conditions occurred in actual sheet forming processes. Three different two-step strain path conditions are created experimentally, and the changes in strain path are verified with simulations. From the results, the predictions of forming limit based on linear strain path forming limit diagram could be overestimated or underestimated under two-step strain path conditions. Thus, the formability of material under two-step strain path conditions can be determined by corresponding experiments using novel specimen designs, instead of predictions made by linear strain path conditions.

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Section: Resultssupporting

confidence: 86%

Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Formability evaluation by novel specimen designs in sheet metal forming with two-step strain paths

Chen

Lee

Gau

2012

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…When necking happens, the corresponding punch displacement at the different friction conditions is shown in Table 3. The friction coefficients in Table 3 are estimated and utilized based on the lubrication conditions specified by Jain et al [17]. The results of the punch displacement at necking are in good agreement with experimental results.…”

Section: Forming Limits At Biaxial Statesupporting

confidence: 53%

Predicting the forming limit diagram of AA 5182-O

Li¹,

Nye

2010

The Journal of Strain Analysis for Engineering Design

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The prediction of a forming limit diagram (FLD) for aluminium alloy sheet using finite element analysis without implementing pre-defined geometrical imperfections or material imperfections is studied. The limit strains of the FLD are determined by applying a new proposed localization criterion in the dome stretching test. The elements just outside the necking area, where their major and minor principal strains have no simultaneous change after localized necking happens, are chosen as the reference elements for measurement of limit strains. Simulations are carried out for various strain paths ranging from balanced biaxial stretching to uniaxial stretching. The predicted FLD of AA 5182-O is compared with an experimentally determined FLD and very good agreement is achieved. It is demonstrated that FLDs can be predicted by the finite element method without requiring any assumed geometric or material imperfections in the numerical model.

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Finite element analysis of axisymmetric sheet stretching process

Huang¹

2006

Int J Adv Manuf Technol

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Effect of reverse dome stretching on dome height and forming limits of sheet materials

Cited by 9 publications

References 10 publications

Formability evaluation by novel specimen designs in sheet metal forming with two-step strain paths

Formability evaluation by novel specimen designs in sheet metal forming with two-step strain paths

Predicting the forming limit diagram of AA 5182-O

Finite element analysis of axisymmetric sheet stretching process

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