Journal ArticleDOI
Damage in sheet metal forming—II. Plastic instability
J.M. Jalinier,J.H. Schmitt +1 more
TLDR
In this article, the forming limit of a material can be calculated through a two-slice sample assuming that: internal defects are equivalent to thickness defects, and the influence of the damage mechanism and the initial thickness of the sheet can be modeled.About:
This article is published in Acta Metallurgica.The article was published on 1982-09-01. It has received 46 citations till now. The article focuses on the topics: Necking & Sheet metal.read more
Citations
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Journal ArticleDOI
Prediction of the forming limit diagrams of anisotropic sheets in linear and non-linear loading.
TL;DR: In this paper, the authors used Hill's theory of plastic anisotropy for both linear and non-linear strain paths in terms of the anisotropic coefficient measured during uniaxial tensile tensile stretching in three different directions referred to the rolling direction.
Journal ArticleDOI
The effect of porosity distribution on ductile failure
TL;DR: In this paper, the effect of porosity on flow localization and failure in a porous material is analyzed numerically using an elastic viscoplastic constitutive relation for porous plastic solids.
Journal ArticleDOI
A simple technique to generate in-plane forming limit curves and selected applications
TL;DR: In this paper, a simple technique to generate in-plane forming limit curves has been developed, based on the Marciniak biaxial stretch test using a single punch/die configuration, but the specimen and washer geometries have been modified to achieve failure in both drawing and stretching deformation modes.
Journal ArticleDOI
Dislocation microstructures in steel during deep drawing
J. V. Fernandes,J.-H. Schmitt +1 more
TL;DR: In this paper, simple and complex loadings are performed on low-carbon steel sheets in order to simulate deep drawing, and the cell shape and its evolution depend on the strain and the strain path.
Journal ArticleDOI
Effects of sheet thickness and anisotropy on forming limit curves of AA2024-T4
Murat Dilmeç,H. Selçuk Halkacı,Fahrettin Ozturk,Fahrettin Ozturk,Haydar Livatyali,Osman Yigit +5 more
TL;DR: In this paper, the effects of sheet thickness and anisotropy of AA2024-T4 on forming limit curve (FLC) are experimentally investigated according to ISO 12004-2 standard.
References
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Journal ArticleDOI
Limit strains in the processes of stretch-forming sheet metal
TL;DR: In this paper, a theoretical analysis of the process of the generation of the groove based on anisotropic plasticity theory is presented, and the system of equations derived was solved numerically with the aid of a computer, which enabled the limiting strain of the sheet metal to be determined as a function of the material.
Journal ArticleDOI
On discontinuous plastic states, with special reference to localized necking in thin sheets
TL;DR: In this article, the authors investigated the permitted discontinuities of stress, velocity, and surface slope in a plastic-rigid sheet deformed in its plane, and the necessary restrictions on the stress-state and rate of workhardening were obtained for any yield function and plastic potential.
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Localized necking in thin sheets
Sigurd Støren,James R. Rice +1 more
TL;DR: Using a simplified constitutive model of a pointed vertex on subsequent yield loci, the onset of localized necking under biaxial stretching has been predicted and this result supports the hypothesis of vertex-formation on the yield locus under continued plastic flow.
Journal ArticleDOI
Influence of strain-rate sensitivity on necking under uniaxial tension
John W. Hutchinson,K. W. Neale +1 more
TL;DR: In this article, the influence of material strain-rate dependence on necking retardation is studied and a nonlinear analysis for long-wavelength nonuniformities does reproduce the essential details of the phenomenon.
Journal ArticleDOI
An experimental study of the in-plane stretching of sheet metal
A.K. Tadros,P.B. Mellor +1 more
TL;DR: In this paper, the authors present experimental results of the limit strains for the in-plane stretching of steel, aluminium and brass sheets, and the development of surface strains is studied in incremental tests and attention is drawn to the crazing of the surface of sheet specimens and to banding in aluminium specimens.