Limit strains in the processes of stretch-forming sheet metal

Marciniak, Z.; Kuczyński, K.

doi:10.1016/0020-7403(67)90066-5

Cited by 1,806 publications

(788 citation statements)

References 2 publications

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“…In stretch forming, shear brings a stabilization effect by reducing the yield stress in tension, as shown by Emmens and van den Boogaard (2009). Shear can explain the increase of the SPIF formability, as analytically shown by Allwood et al (2007) and Eyckens et al (2009), using an extended Marciniak and Kuczynski (1967) model. -under-tension (BUT).…”

Section: Formabilitymentioning

confidence: 84%

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Damage prediction in single point incremental forming using an extended Gurson model

Guzmán

Yuan

Duchêne

et al. 2018

International Journal of Solids and Structures

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Single point incremental forming (SPIF) has several advantages over traditional forming, such as the high formability attainable by the material. Different hypotheses have been proposed to explain this behavior, but there is still no straightforward relation between the particular stress and strain state induced by SPIF and the material degradation leading to localization and fracture. A systematic review of the state of the art about formability and damage in SPIF is presented and an extended Gurson-TvergaardNeedleman (GTN) model was applied to predict damage in SPIF through finite element (FE) simulations. The line test was used to validate the simulations by comparing force and shape predictions with experimental results. To analyze the failure prediction, several simulations of SPIF cones at different wall angles were performed. It is concluded that the GTN model underestimates the failure angle on SPIF due to wrong coalescence modeling. A physically-based Thomason coalescence criterion was then used leading to an improvement on the results by delaying the onset of coalescence.

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Section: Formabilitymentioning

confidence: 84%

“…FLDs were initially introduced by Keeler and Backofen (1963) and Marciniak and Kuczynski (1967). This commonly used framework has been widely adopted in the literature but suffers from important drawbacks when applied to SPIF (Emmens and van den Boogaard, 2009).…”

Section: Formabilitymentioning

confidence: 99%

Damage prediction in single point incremental forming using an extended Gurson model

Guzmán

Yuan

Duchêne

et al. 2018

International Journal of Solids and Structures

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“…Nakazima) tests [2,8], cruciform tests [9][10][11], flat punch (i.e. Marciniak) tests [12,13], multiaxial compression tests [14,15], electromagnetic forming tests [16,17] (Fig. 1).…”

Section: Critical Comparison Of Potential Testing Methodologies For Mmentioning

confidence: 99%

Multi-Axial Deformation Setup for Microscopic Testing of Sheet Metal to Fracture

et al. 2011

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While the industrial interest in sheet metal with improved specific-properties led to the design of new alloys with complex microstructures, predicting their safe forming limits and understanding their microstructural deformation mechanisms remain as significant challenges largely due to the inadequacy of the existing experimental tools. The investigation of the strain-path dependent failure mechanisms requires miniaturized testing equipment, which can be placed in a scanning electron microscope for in situ experiments. So far, such tests could only be carried out for a single strain path (uniaxial tension). In this work, in order to fill this gap, a miniaturized Marciniak test setup is designed, built and tested. With this setup real-time, multi-axial tests of industrial sheet metal can be carried out to the point of fracture within a

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“…The adherence between the two layers is assumed to be perfect. In order to predict localized necking in the bilayer, the overall mechanical behavior is coupled with two different localization criteria: the bifurcation theory, initially developed by Rice [5], and the imperfection approach initiated by Marciniak and Kuczynski [6]. The use of the Schmid law at the single crystal scale allows predicting limit strains at realistic levels when the bifurcation theory is used as localization criterion.…”

Section: Introductionmentioning

confidence: 99%

Ductility prediction of substrate-supported metal layers based on rate-independent crystal plasticity theory

Bettaieb

Abed‐Meraim

2018

Int J Mater Form

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Abstract. In this paper, both the bifurcation theory and the initial imperfection approach are used to predict localized necking in substrate-supported metal layers. The self-consistent scale-transition scheme is used to derive the mechanical behavior of a representative volume element of the metal layer from the behavior of its microscopic constituents (the single crystals). The mechanical behavior of the elastomer substrate follows the neo-Hookean hyperelastic model. The adherence between the two layers is assumed to be perfect. Through numerical results, it is shown that the limit strains predicted by the initial imperfection approach tend towards the bifurcation predictions when the size of the geometric imperfection in the metal layer vanishes. Also, it is shown that the addition of an elastomer layer to a metal layer enhances ductility.

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Limit strains in the processes of stretch-forming sheet metal

Cited by 1,806 publications

References 2 publications

Damage prediction in single point incremental forming using an extended Gurson model

Damage prediction in single point incremental forming using an extended Gurson model

Multi-Axial Deformation Setup for Microscopic Testing of Sheet Metal to Fracture

Ductility prediction of substrate-supported metal layers based on rate-independent crystal plasticity theory

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