Journal ArticleDOI
The influence of strain path on subsequent mechanical properties—Orthogonal tensile paths
D. J. Lloyd,H. Sang +1 more
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In this article, several aluminum alloys have been subjected to two stage tensile straining, an initial prestrain followed by a subsequent tensile strain at 90 deg to the initial direction.Abstract:
Several aluminum alloys have been subjected to two stage tensile straining, an initial prestrain followed by a subsequent tensile strain at 90 deg to the initial direction. In AA1100-0 and AA3003-0 the prestrain produces dislocation tangling and diffuse cell walls resulting in an enhanced flow stress and decrease in ductility when the material, is subsequently strained in the orthogonal direction. In a fine grained experimental Al−Fe−Ni alloy the prestrain is accompanied by a very low accumulation of dislocations and in this case the flow stress is reduced and ductility enhanced in subsequent orthogonal straining. The commercial alloys AA2036-T4 and AA5182-0 are unaffected by the two stage tensile strain path. The results are considered in terms of the forming limit curve and it is also shown that the behavior is consistent with the concept of an “alien” dislocation distribution being generated during the prestrain.read more
Citations
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Journal ArticleDOI
An alternative to kinematic hardening in classical plasticity
TL;DR: In this paper, an approach is proposed for the description of the plastic behavior of materials subjected to multiple or continuous strain path changes, which is not formulated with a kinematic hardening rule.
Journal ArticleDOI
The influence of strain-path changes on forming limit diagrams of A1 6111 T4
TL;DR: In this paper, the effects of changing strainpaths on forming limits of aluminum alloy 6111 T4 have been investigated by determining forming limit diagrams (FLDs) of specimens prestrained to several levels in uniaxial, plane strain and biaaxial tension, parallel and perpendicular to the prior rolling direction.
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
Plastic flow for non-monotonic loading conditions of an aluminum alloy sheet sample
Frédéric Barlat,Frédéric Barlat,J.M. Ferreira Duarte,José Grácio,Augusto B. Lopes,Edgar F. Rauch +5 more
TL;DR: In this paper, the behavior of the material after reloading was analyzed in terms of dislocation microstructure and crystallographic texture evolutions using uniaxial tension tests interrupted during loading to assess the recovery that takes place during this time.
Journal ArticleDOI
Effect of texture and microstructure on strain hardening anisotropy for aluminum deformed in uniaxial tension and simple shear
Augusto B. Lopes,Frédéric Barlat,Frédéric Barlat,José Grácio,J. Ferreira Duarte,Edgar F. Rauch +5 more
TL;DR: In this article, uniaxial and simple shear stress-strain curves were obtained for a 1050-O aluminum alloy sheet sample in different specimen orientations with respect to the material symmetry axes.
References
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Journal ArticleDOI
The Instability of the Work Hardened State. I. Slip in Extraneously Deformed Crystals
Z. S. Basinski,P. J. Jackson +1 more
TL;DR: In this paper, the dislocation distributions in strained crystals were studied by an etch pit technique and it was found that slip band formation is accompanied by dislocation multiplication on the main glide plane but not on other planes.
Journal ArticleDOI
On anomalously low work-hardening in pre-strained metals
Journal ArticleDOI
The Bauschinger effect in polycrystalline aluminium containing coarse particles
TL;DR: The Bauschinger effect developed in Al-6, Ni and Al-7.6% Ca containing coarse intermetallic particles has been measured for a range of microstructures as mentioned in this paper.
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