Wrinkling prediction for GPa-grade steels in sheet metal forming process

Won, Chan-Hee; Kim, Hyung-Gyu; Lee, Seokryul; Kim, Dong-Jin; Park, Sunghyuk; Yoon, Jonghun

doi:10.1007/s00170-019-03518-3

Cited by 15 publications

(11 citation statements)

References 25 publications

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Section: Verificationmentioning

confidence: 74%

“…Subsequently, the WLCs obtained by the hybrid method between experiment and simulation of the modified Yoshida buckling tests in combination with the bifurcation theory were applied for evaluating the wrinkling onset of the rectangular cup samples. It is noted that the concerned wrinkle hereby was related to a non-flange wrinkling of drawn samples as described in Won et al 30 AA5052-O. For the aluminium grade AA5052-O, major and minor true strains of formed samples with increasing drawing depths were gathered from the simulations and plotted in a strain diagram along with the corresponding WLCs.…”

Section: Evaluation Of Wrinkling Initiationmentioning

confidence: 99%

“…The linear constructed WLCs of both investigated sheets in the RD and TD were noticeably different and all located between the pure shear (φ 1 = −φ 2 ) and tension (φ 1 = −2φ 2 ) stress states. Such WLCs could be applied to describe a non-flange wrinkling of sheet metal during forming process as shown in Won et al 30 . It was noticed that the C-O and C-M samples with symmetric shape showed considerably higher strain levels at the wrinkling initiation point than other unsymmetrical samples.…”

Section: Determination Of Wlcsmentioning

confidence: 99%

“…The established WLD was verified by a contactless full-field strain measurement. Won et al 30 introduced a phenomenological wrinkling criterion for predicting the occurrence of severe wrinkles by forming high-strength steel sheets. Hereby, a critical compressive strain concerning instantaneous geometrical bending strain and triaxiality was determined.…”

Section: Introductionmentioning

confidence: 99%

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Wrinkling limit curves with consideration of anisotropic behaviour for the deep drawing of aluminium sheet alloys

Panich

Uthaisangsuk²

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this work, a combined experimental and finite-element (FE)-based approach was introduced for determining the wrinkling limit curves (WLCs) of sheet metals during forming processes. Aluminium sheets of grade AA5052-O and AA5052-H32 with different formabilities and anisotropic behaviours were investigated. Modified Yoshida buckling tests were carried out for aluminium sheets in both the rolling (RD) and transverse direction (TD). In parallel, FE simulations of the buckling tests were conducted, in which the Hill’48 (both r- and stress-based) yield criteria and Swift strain hardening law were incorporated. Local principal strain histories of observed wrinkle areas on both surfaces of samples were gathered from the simulations and the state of wrinkling initiation was then identified at the inclination of these strain paths. The calculated strain values were verified with developed compressive stresses as well as corresponding strains measured by a digital image correlation technique. The influences of material anisotropies and used yield functions on the determined WLCs were discussed. Subsequently, the determined WLCs were applied for evaluating non-flange wrinkling formation during a rectangular cup drawing test. The forming tests were experimentally and numerically performed for the examined aluminium sheets in both RD and TD. It was found that strain distributions of critical side wall areas at predicted wrinkling onset and severe wrinkle states were well correlated with the WLCs. Thus, WLCs based on the r-based criterion could more accurately describe the non-flange wrinkling incidents of the cup-drawn samples than those of the stress-based model.

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Section: Verificationmentioning

confidence: 74%

Section: Evaluation Of Wrinkling Initiationmentioning

confidence: 99%

Section: Determination Of Wlcsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Wrinkling limit curves with consideration of anisotropic behaviour for the deep drawing of aluminium sheet alloys

Panich

Uthaisangsuk²

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…19 Recently, a phenomenological wrinkling criterion was developed to find critical compressive strains and bending strains with specific triaxiality. 20 This criterion shows superior performance in prediction of wrinkling instability. Sensitive prediction of the wrinkling instability by triple nonlinearity evolution was analyzed by Li et al 21 This triple nonlinearity evolution with multi-geometric micro-defects and anisotropy displayed in the numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

An integrated experimental and finite element approach for wrinkling limit prediction of Inconel 718 alloy at elevated temperatures

Mahalle

Kotkunde

Gupta

et al. 2021

The Journal of Strain Analysis for Engineering Design

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Wrinkling is generally induced because of metal instability and considered as an undesirable defect in sheet metal forming processes. Wrinkling leads to severe influence on functional requirements and aesthetic appeal of final component. Thus, the present research is mainly dedicated on the experimental and numerical analysis for wrinkling behavior prediction of Inconel 718 alloy at elevated temperature conditions. Initially, Yoshida buckling tests (YBT) have been conducted to investigate wrinkling tendencies of Inconel 718 alloy from room temperature (RT) to 600°C by an interval of 200°C. Subsequently, Finite Element (FE) analysis of YBT has been performed to analyze post buckling behavior. Critical strain values at onset of wrinkling are determined and strain based wrinkling limit curves (ε-WLCs) are plotted at different temperatures. In-plane principal strains are transferred to effective plastic strain (EPS) versus triaxiality (η) space to differentiate the transformation between safe and wrinkling instability. Finally, complete forming behavior of alloy is represented by means of fracture, forming, and wrinkling limit curves. The gap between forming and wrinkling limit curves at elevated temperature is ∼1.5 times higher than that at room temperature.

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Minimizing wrinkling formation of GPa-grade steels in multi-stage crash forming process

Won

Kim

Yoon

2019

Int J Adv Manuf Technol

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Wrinkling prediction for GPa-grade steels in sheet metal forming process

Cited by 15 publications

References 25 publications

Wrinkling limit curves with consideration of anisotropic behaviour for the deep drawing of aluminium sheet alloys

Wrinkling limit curves with consideration of anisotropic behaviour for the deep drawing of aluminium sheet alloys

An integrated experimental and finite element approach for wrinkling limit prediction of Inconel 718 alloy at elevated temperatures

Minimizing wrinkling formation of GPa-grade steels in multi-stage crash forming process

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