Journal ArticleDOI
Limit strains in the processes of stretch-forming sheet metal
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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.About:
This article is published in International Journal of Mechanical Sciences.The article was published on 1967-09-01. It has received 1814 citations till now. The article focuses on the topics: Forming limit diagram & Groove (music).read more
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A gradient approach to localization of deformation. I. Hyperelastic materials
TL;DR: In this article, a new framework for considering the localization of deformation and illustrate it for the case of hyperelastic materials is proposed, where strain-induced localized deformation patterns are accounted for by adding a second deformation gradient-dependent term to the expression for the strain energy density, leading to equilibrium equations which remain always elliptic.
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
Predicting failure modes and ductility of dual phase steels using plastic strain localization
TL;DR: In this article, the authors predicted the ductile failure of dual phase steels in the form of plastic strain localization resulting from the incompatible deformation between the harder martensite phase and the softer ferrite matrix.
Book ChapterDOI
Limits to ductility set by plastic flow localization
Alan Needleman,James R. Rice +1 more
TL;DR: The theory of strain localization is reviewed with reference both to local necking in sheet metal forming processes and to more general three dimensional shear band localizations that sometimes mark the onset of ductile rupture as mentioned in this paper.
Journal ArticleDOI
Development of a Processing Map for Use in Warm-Forming and Hot-Forming Processes
TL;DR: In this article, a fracture initiation map is developed which should be useful in fast forming operations at strain rates greater than about 10-3 s-1 at elevated temperatures, and two types of cavitation mechanisms, one pertaining to cavity formation at second phase particles, as in ductile fracture, and the other pertaining to wedge type microcracking at grain boundaries, are considered.
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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
C. A theory of the plastic bulging of a metal diaphragm by lateral pressure
TL;DR: In this article, explicit formulae are obtained for the stresses in a metal diaphragm which is bulged plastically by lateral pressure, and the predicted influence of work-hardening on the shape of the profile, and on the relation between polar strain and curvature, agree well with experimental data.