Experimental and Numerical Analysis on Dual Phase Steel (DP780) Sheet Forming Limit and Effect of Microstructure Evolution on Formability

Bhargava, Marrapu; Barnwal, Vivek Kumar; Chakrabarty, Shanta; Tewari, Ashish; Mishra, Sushil

doi:10.1007/s11665-020-05247-1

Cited by 3 publications

(2 citation statements)

References 38 publications

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“…Heidari et al [25] also found that the simulation results showed large deviations on the right side of the FLD when the formability of alloy AA6063 was evaluated using the ductile fracture criterion. Marrapu et al [26] used numerical and experimental methods to evaluate the formability of DP780 steel; the results showed that the simulation results of the strain localization criterion in the principal strain gradient method [27] were in good agreement with the experimental results. Lumelskyj et al [28] performed Nakajima tests on DC04 steel to verify the accuracy of the numerical results under two different necking criteria.…”

Section: Introductionmentioning

confidence: 97%

A New Method for Determining Necking of Sheet Metal Based on Main Strain Topography

Shi,

Yang,

Hou

et al. 2024

Coatings

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There are various methods to evaluate the forming limit of a sheet, and these criteria can be classified as position-dependent, time-dependent, and position-time dependent according to the basis of judgment. However, these criteria have a single function and can only find the forming limit of the sheet and cannot determine the strain distribution, strain change, or fracture location during the sheet forming process. This paper introduces a time–location-dependent method, i.e., the spatial strain rate method, which is used to detect the onset of necking of a sheet. The spatial strain rate is directly based on the strain and can not only find the forming limit of the sheet but also depict the strain distribution and strain variation during the two phases of the experimental process—distributed instability and concentrated instability—as well as predict the location of sheet fracture. The spatial strain rate of AA5083 aluminum alloy of different widths was analyzed and verified in detail via Nakazima experiments using digital image correlation techniques and compared with the guidelines published in the literature in recent years.

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Section: Introductionmentioning

confidence: 97%

A New Method for Determining Necking of Sheet Metal Based on Main Strain Topography

Shi,

Yang,

Hou

et al. 2024

Coatings

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“…Therefore, specimen in the Marciniak test can be considered as plane stress conditions in the central part. Marrapu et al [11] utilized both numerical and experimental methods to assess the formability of DP780 steel; the consequences showed that the simulation based on the major true strain gradient method (strain localization criterion in [12]) had great consistency with the experimental results. Likewise, Nakajima tests on DC04 steel were developed by Lumelskyj et al [13] to validate the accuracy of numerical results under two different necking criteria.…”

Section: Introductionmentioning

confidence: 99%

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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Formability and micromechanisms of DP600 dual phase steels in electric-pulse triggered energetic materials forming

Xie

2022

Journal of Materials Processing Technology

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Experimental and Numerical Analysis on Dual Phase Steel (DP780) Sheet Forming Limit and Effect of Microstructure Evolution on Formability

Cited by 3 publications

References 38 publications

A New Method for Determining Necking of Sheet Metal Based on Main Strain Topography

A New Method for Determining Necking of Sheet Metal Based on Main Strain Topography

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

Formability and micromechanisms of DP600 dual phase steels in electric-pulse triggered energetic materials forming

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