Mechanics of sheet-bulk indentation

Sieczkarek, Peter; Isik, Kerim; Khalifa, Nooman Ben; Martins, P.A.F.; Tekkaya, A. Erman

doi:10.1016/j.jmatprotec.2014.05.018

Cited by 24 publications

(16 citation statements)

References 11 publications

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“…5a, the force grows monotonically with displacement for all test cases. The upper tails associated to the higher growing rates start at approximately 5.5 mm displacement and correspond to the transition from free to constraint thickening due to the filling up of the die cavity, as it was previously explained by Sieczkarek et al [10]. The final decrease in force is due to unloading after finishing the indentations.…”

Section: Finite Element Modellingsupporting

confidence: 62%

“…During the first part of the paper, the analysis is centred on the extent of the plastic deformation region to the vicinity of the punch, on the influence of strain hardening in subsequent indentations and on the material sideway spread arising from indentations that are performed very close to the width edges. The indentations are performed with sheet thickening, and the overall experimental plan may be considered as the continuation of the work on the mechanics of sheet-bulk indentation that was previously published by the authors [10].…”

Section: Introductionmentioning

confidence: 99%

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Incipient and repeatable plastic flow in incremental sheet-bulk forming of gears

Sieczkarek

Wernicke

Gies

et al. 2016

Int J Adv Manuf Technol

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This paper analyses the differences between incipient and repeatable material flow in the incremental sheet-bulk metal forming (SBMF) of gears produced by indentation along the direction perpendicular to the sheet thickness. The underfilling of the punch cavity during the first indentation, which prevents the production of sound disk gears, is explained on the basis of constrained material flow under material strain hardening. A solution based on the utilization of a tailored disk blank is proposed to overcome this defect. The geometry of the tailored disk blank is determined by means of finite element analysis, and the overall methodology involved material characterization and experimentation with DC04 mild steel. The discussion on the extent of the plastic deformation region under constrained and free-material flow during indentation is complemented by experimental results obtained with a flat punch in rectangular sheet blanks of aluminium EN AW-1050A.

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Section: Finite Element Modellingsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Incipient and repeatable plastic flow in incremental sheet-bulk forming of gears

Sieczkarek

Wernicke

Gies

et al. 2016

Int J Adv Manuf Technol

Self Cite

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“…The tribological system and local strain hardening affect the material flow in SBMF. Both aspects were analysed in a closed-form analytical framework including experiments [7]. Numerical investigation on thickening blanks identified an interaction between friction and the material flow, too [8].…”

Section: Materials Flow and Tribological Conditions In Sbmfmentioning

confidence: 99%

Plastic flow and its control in sheet–bulk metal forming of thin-walled functional components

2015

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“…This punch represents an inverted form of the first geometry suggested for 45° ( Figure 7C). This kind of geometry can be found, for example, in the manufacturing processes of gear discs [11].…”

Section: Geometry 3: Inverted Punchmentioning

confidence: 99%

“…In addition, other process parameters can have an effect, like the step over, feed rate or penetration [10][11][12]. The purpose of this paper is twofold: first, it aims to characterize the workpiece behaviour under different punch geometries.…”

Section: Introductionmentioning

confidence: 99%

Study of the Tool Geometry Influence in Indentation for the Analysis and Validation of the New Modular Upper Bound Technique

et al. 2016

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Focusing on incremental bulk metal forming processes, the indentation process is gaining interest as a fundamental part of these kinds of processes. This paper presents the analysis of the pressure obtained in indentation under the influence of different punch geometries. To this end, an innovative Upper Bound Theorem (UBT) based solution is introduced. This new solution can be easily applied to estimate the necessary force that guarantees plastic deformation by an indentation process. In this work, we propose an accurate analytical approach to analyse indentation under different punches. The new Modular Upper Bound (MUB) method presents a simpler and faster application. Additionally, its complexity is not considerably increased by the addition of more Triangular Rigid Zones. In addition, a two-dimensional indentation model is designed and implemented using the Finite Element Method (FEM). The comparison of the two methods applied to the indentation process analysed-the new Modular Upper Bound technique and the Finite Element Method-reveal close similarities, the new Modular Upper Bound being more computationally efficient.

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Mechanics of sheet-bulk indentation

Cited by 24 publications

References 11 publications

Incipient and repeatable plastic flow in incremental sheet-bulk forming of gears

Incipient and repeatable plastic flow in incremental sheet-bulk forming of gears

Plastic flow and its control in sheet–bulk metal forming of thin-walled functional components

Study of the Tool Geometry Influence in Indentation for the Analysis and Validation of the New Modular Upper Bound Technique

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