Prediction of fracture in hub-hole expanding process using a new ductile fracture criterion

Ko, Young Koan; Lee, J.S.; Huh, Hoon; Kim, H.K.; Park, S.H.

doi:10.1016/j.jmatprotec.2006.11.071

Cited by 133 publications

(34 citation statements)

References 6 publications

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“…Clearly the analysis of HER made by Wang et al is too limited, and fails to take some essential aspects of HE performance of a material into account. Ko et al 7 have studied the HER of hot rolled steel by means of Finite Element Method (FEM) taking standard ductile fracture criteria into account. They found that the FEM‐predicted HER was much lower than the experimental HE test result.…”

Section: Discussionmentioning

confidence: 99%

“…Three types of HE tests can be defined based on the shape of the punch: (1) flat bottomed punch, (2) conical punch and (3) hemispherical punch. Table 3 reviews the test conditions reported in technical specifications and in the literature 2–11. Whereas most reported HE results are obtained from tests using a 60° conical punch, the flat punch type proposed by Siebel and Pomp 12 was used in the present work (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

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Stretch‐Flangeability of High Mn TWIP steel

Chen

Kim

et al. 2010

steel research int.

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The mechanical properties of austenitic high Mn Twinning Inducted Plasticity (TWIP) steel provide an excellent combination of strength and ductility when tested in uni-axial tension. The performance of TWIP steel during some critical formability tests such as deep drawing, bulge test and cutting edge stretching has not yet been studied extensively. In this contribution, the stretch-flangeability of Fe18Mn0.6C1.5Al TWIP steel and Ti Interstitial-Free (IF) steel were studied by means of hole expansion test. In-situ strain analysis and Infra-red (IR) thermography were carried out during the test. It was found that TWIP steel, despite having a higher uniform elongation in uniaxial tension, had poorer hole expansion properties than Ti IF steel. Strain distribution analysis revealed that the hole edge deformed in a deep drawing mode which was similar to a tensile deformation. Away from the hole edge, the deformation mode changed gradually from deep drawing to stretch forming mode. The IRthermography of TWIP steel revealed a high degree of adiabatic heating which was absent in the case of IF steel. The crack associated with the edge fracture revealed a local temperature increase at the crack tip of up to 928C. Two types of hole edge preparations were studied. A high quality hole edge finish resulted in a better hole expansion performance. The fractography of the crack plane surface of TWIP steel and Ti IF were also studied by SEM, and revealed a plastic failure mode in both cases.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Stretch‐Flangeability of High Mn TWIP steel

Chen

Kim

et al. 2010

steel research int.

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“…In theoretical studies, finite element analysis (FEA) that considers the ductile fracture criterion has been used to predict the HER of sheet metals [8,20,23]. FEA can use spatial distribution, crystallographic orientation and volume fraction of the real microstructure to simulate micromechanical deformation behaviors in the constituent phases during the expansion of a hole [16][17][18][19]. Most FEA has been limited to explaining the deformation and fracture behaviors in the edge of a punched hole, but the microtexture evolution that is induced by the punching of a hole has not been properly investigated [13,16,20,21,23].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Examining the microtexture evolution in a hole-edge punched into 780 MPa grade hot-rolled steel

Shin

Kim

et al. 2016

Materials Characterization

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“…In the last few decades, numerous damage criteria were developed [21][22][23][24][25][26][27][28][29][30], varying in the use of function Φ(σ). A comparison of ten selected damage criteria, listed in chronological order is presented in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Rotational Compression of Cylindrical Specimen As a New Calibrating Test for Damage Criteria

et al. 2020

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The subject-matter of the article is the ductile fracture of materials—A phenomenon occurring in numerous metal forming processes. In order to prognosticate the possibility of a fracture, damage criteria are employed. Their effectiveness, however, depends on the accurate determination of the critical values of damage. These values are obtained through calibrating tests, where the stress state has to be as similar to the actual process as possible. The currently employed calibrating tests do not enable one to determine the limit values of the damage function when the Mannesmann effect occurs. Therefore it was not possible to effectively prognosticate the material fracture in the processes of cross- and skew-rolling. A new calibrating test, based on rotational compression of a cylindrical sample, in which the fractures are caused by the Mannesmann effect, was developed at the Lublin University of Technology. This test was discussed in the article, with a particular focus on the stress and strain state in the sample. A practical use of the test was presented on the example of C45 grade steel, formed in the temperature equal 1150 °C. In the research ten material damage criteria were adopted.

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Prediction of fracture in hub-hole expanding process using a new ductile fracture criterion

Cited by 133 publications

References 6 publications

Stretch‐Flangeability of High Mn TWIP steel

Stretch‐Flangeability of High Mn TWIP steel

Examining the microtexture evolution in a hole-edge punched into 780 MPa grade hot-rolled steel

Rotational Compression of Cylindrical Specimen As a New Calibrating Test for Damage Criteria

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