Directional distortional hardening in metal plasticity within thermodynamics

Feigenbaum, HP; Dafalias, YF

dc.contributor.author	Feigenbaum, HP	en
dc.contributor.author	Dafalias, YF	en
dc.date.accessioned	2014-03-01T01:26:10Z
dc.date.available	2014-03-01T01:26:10Z
dc.date.issued	2007	en
dc.identifier.issn	0020-7683	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17946
dc.subject	Distortional hardening	en
dc.subject	Plasticity	en
dc.subject	Thermodynamics	en
dc.subject.classification	Mechanics	en
dc.subject.other	Hardening	en
dc.subject.other	Inverse kinematics	en
dc.subject.other	Plasticity	en
dc.subject.other	Tensors	en
dc.subject.other	Thermodynamics	en
dc.subject.other	Directional distortion	en
dc.subject.other	Distortional hardening	en
dc.subject.other	Tensor-valued internal variables	en
dc.subject.other	Metal forming	en
dc.title	Directional distortional hardening in metal plasticity within thermodynamics	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.ijsolstr.2007.04.025	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ijsolstr.2007.04.025	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	This paper presents a complete theory for metal plasticity that includes isotropic, kinematic, and directional distortional hardening. within the framework of thermodynamics. Directional distortion is defined here as the formation of a region of high curvature on the yield surface, approximately in the direction of loading, and a region of flattening approximately in the opposite direction, as observed in experiments on various types of metals. The distinguishing features of this theory are the introduction of a fourth order tensor-valued internal variable, whose evolution in conjunction with a directional scalar multiplier describes the evolving directional distortion, and the fact that the hardening laws for all internal variables are derived on the basis of sufficient conditions to satisfy the thermodynamic requirement of positive dissipation. The applicability of the theory is illustrated by fitting experimental data on distorted yield surfaces in the course of plastic deformation. (c) 2007 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	International Journal of Solids and Structures	en
dc.identifier.doi	10.1016/j.ijsolstr.2007.04.025	en
dc.identifier.isi	ISI:000250899500027	en
dc.identifier.volume	44	en
dc.identifier.issue	22-23	en
dc.identifier.spage	7526	en
dc.identifier.epage	7542	en