Effect of Planar Anisotropy on the Hole Expansion Ratio of Cold-Rolled DP 590 Steel

Chinara, Manaswini; Paul, Surajit Kumar; Chatterjee, S.; Mukherjee, Subrata

doi:10.1007/s12666-021-02444-x

Cited by 8 publications

(3 citation statements)

References 32 publications

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“…Post HET, specimens of different steels are shown in Figure 2. Chinara 31 reported that the crack location after HET (w-EDM machined central hole edge) depends upon the anisotropy of the material. From the anisotropy coefficients of the steel at a different angle to RD, the location of the crack during HET can be predicted.…”

Section: Resultsmentioning

confidence: 99%

“…At the same time, HER prediction was improved considering the anisotropy of the sheet. Chinara et al 31 noticed that the minimum r-value, maximum thickness reduction, and crack initiation site are identical (45° to rolling direction) for the hole expansion test of DP 590 steel with W-EDM hole (smooth hole edge). According to the authors’ knowledge, the information regarding crack angle in the punched sample hole expansion test is not observed in any literature.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of hole expansion ratio for automotive-grade steels

Chinara

Paul

Chatterjee

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Hole expansion ratio (HER) is widely used to quantify the stretch-flangeability of sheet metal. HER is determined from the maximum limit of successful expansion of a central hole by a conical punch. The central hole edge is prepared by the punching process. Around 45° cracks are noticed at the central hole edge after successfully completing the hole expansion test. HER of punched hole correlates with uniaxial tensile properties like yield strength, ultimate tensile strength, total elongation, post-uniform elongation, and coefficient of normal anisotropy. Comparisons of strength (yield strength, ultimate tensile strength), anisotropy (coefficient of normal anisotropy) and deformation (total elongation, post-uniform elongation) parameters among steel grades are essential to relate HER among steel grades. Interstitial free steel is the highest, and SPFH steel is the lowest HER among the four steel grades. HER correlates nicely with the notch mouth opening displacement at peak load.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation of hole expansion ratio for automotive-grade steels

Chinara

Paul

Chatterjee

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Where F, G, H, L, M and N are the Hill anisotropy coefficients, which can be expressed as follows Eq (3) [33]:…”

Section: Modelling and Numerical Simulationmentioning

confidence: 99%

Experimental investigation and numerical optimization of sheet metal forming limits during deep drawing process of DD14 steel

Hamza,

Boussaid,

Hamadache

et al. 2024

Res. Eng. Struct. Mat.

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This work aims to experimentally study the deep drawability of DD14 hot-rolled steel sheets and to optimize numerically the material formability. The material anisotropy was confirmed by metallographic analysis of the material and tensile tests on specimens taken in three orientations with respect to the sheet rolling direction. Where the stress-strain curves show a sensitivity of material to the Piobert-Lüders phenomenon. The die pressure and the blank holder were considered as controlling factors on plastic instability and the success of the deep drawing operation. The forming limit curves (FLC) were plotted to highlight the different deformation modes that the sheet metal underwent during the deep drawing process. The collected deep-drawn parts observation shows severe plastic instability, until fracture. The initial plastic anisotropy is determined by the Hill48 quadratic criterion and the work hardening by the Hollomon power law. It results, during the experimental tests, that the front bottom corners of the deep drawn part are the areas at high risk of damage. The various numerical simulation scenarios followed by comparisons with the experimental results, allowed us to confirm the optimum conditions that minimize the material's plastic instability risks, forming operation “Step” and BHP “Amplitude”.

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