Finite element analysis of hole-flanging process with various anisotropy assumptions

Kacem, Ahmed; Krichen, Abdelkader; Manach, Pierre‐Yves

doi:10.1007/s00170-015-6980-y

Cited by 9 publications

(1 citation statement)

References 14 publications

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“…In addition to the initial pre-cut hole size and punch shape, other process parameters that affect the final flange include the blank-holding force, as analysed by Krichen et al [10], the clearance between the punch and the die, and the material anisotropy, as investigated by Kacem et al [11,12]. As reported in these studies, the punch-die clearance seems to be an influential factor as far as, depending on its value, ironing could develop.…”

Section: Introductionmentioning

confidence: 95%

Analysis of formability in conventional hole flanging of AA7075-O sheets: punch edge radius effect and limitations of the FLC

et al. 2019

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Hole flanges are commonly manufactured in mass production by conventional press-working. In an industrial context, the process limits are usually evaluated by means of the Limiting Forming Ratio (LFR), which defines the maximum attainable diameter of the flange related to the initial pre-cut hole. Nevertheless, the LFR does not provide enough information about material deformation, thickness distribution or the expected onset and type of failure. In this sense, a systematic investigation using the Forming Limit Diagram (FLD) is needed. Under these circumstances, the aim of this work is to provide a better understanding of the deformation process in conventional hole flanging, analysing the effect of the punch edge radius as well as the influence of the strain distribution along the hole flange on formability. An experimental campaign on 1.6 mm thickness AA7075 annealed sheet was completed using cylindrical punches with different profile radii. In addition, numerical modelling of the process using finite elements was developed. The results allow better understanding of the physical mechanisms governing material deformation and process formability in very ductile materials. In this regard, this research work contributes to the current state of the art in conventional hole flanging by establishing the modes of failure that prevail in the process and the influence of the bending induced by the tool radius in the flange formability. In addition, the limitations of using conventional FLD for providing a limiting threshold for the strain states attained in the flanges deformed with different punch profiles are also identified.

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Section: Introductionmentioning

confidence: 95%