Journal ArticleDOI
Forming limit diagram generation with reduced experiments and modelling for different grades of automotive sheet steel using CrachLab
TLDR
In this paper, the authors present a failure criteria for sheet metal forming analysis, which is one of the most commonly used failure criteria in sheet metal form analysis, based on the formation limit diagram.Abstract:
Forming limit diagram is one of the most commonly used failure criteria for sheet metal forming analysis. Forming limit diagram generation is time-consuming, and therefore, any reduction in the tes...read more
Citations
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Fundamental aspect of stretch-flangeability of sheet metals:
TL;DR: In this paper, it was shown that hole expansion ratio cannot be determined from uniaxial tensile test, even though UDT deformation occurs in sheet metal, and that stretch-flangeability of sheet metal is normally represented by hole expansion ratios.
Journal ArticleDOI
Forming Limit Diagram Generation from In-Plane Uniaxial and Notch Tensile Test with Local Strain Measurement through Digital Image Correlation
TL;DR: In this article, the left side of the forming limit curve (uniaxial tensile to plane strain tensile) is experimentally determined from in-plane uniaxial and notch tensile test with local strain measurement through digital image correlation technique.
Journal ArticleDOI
Influence of the contact with friction on the deformation behavior of advanced high strength steels in the Nakajima test
TL;DR: In this paper, the authors present a new understanding on the deformation mechanics involved in the Nakajima test, which is commonly used to determine the forming limit curve of sheet metals.
Journal ArticleDOI
Effect of Planar Anisotropy on the Hole Expansion Ratio of Cold-Rolled DP 590 Steel
TL;DR: In this article, a planar anisotropic yield stress ratio of DP 590 steel and crack location were predicted from the finite element model for Wire-Electrical Discharge Machine cut central hole edge in the present work.
Journal ArticleDOI
Development of Measurement Equipment and Experimental and Numerical Simulation Studies for Warm Forming Limits of High-Strength Steel.
TL;DR: In this article, a set of measurement equipment for the warm forming limits of high-strength steel based on the Nakazima bulging test method and the digital image correlation method is described.
References
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Journal ArticleDOI
A theory of the yielding and plastic flow of anisotropic metals
TL;DR: In this article, a theory is suggested which describes the yielding and plastic flow of an anisotropic metal on a macroscopic scale and associated relations are then found between the stress and strain-increment tensors.
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
Plastic instability under plane stress
TL;DR: In this paper, conditions for instability of plastic strain under plane stress for a material conforming to the Mises-Hencky yield condition and strain-hardening according to a unique relationship between root-mean-square values of shear stress (q) and incremental strain (δψ).
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.
Journal ArticleDOI
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.
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Determination of forming limit diagrams – a new analysis method for characterization of materials' formability
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