Multiaxial ratcheting with advanced kinematic and directional distortional hardening rules

Feigenbaum, HP; Dugdale, J; Dafalias, YF; Kourousis, KI; Plesek, J

dc.contributor.author	Feigenbaum, HP	en
dc.contributor.author	Dugdale, J	en
dc.contributor.author	Dafalias, YF	en
dc.contributor.author	Kourousis, KI	en
dc.contributor.author	Plesek, J	en
dc.date.accessioned	2014-03-01T02:11:28Z
dc.date.available	2014-03-01T02:11:28Z
dc.date.issued	2012	en
dc.identifier.issn	00207683	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29912
dc.subject	Cyclic loading	en
dc.subject	Directional distortional hardening	en
dc.subject	Plasticity	en
dc.subject	Ratcheting	en
dc.subject	Thermodynamics	en
dc.subject.other	Biaxial stress	en
dc.subject.other	Cyclic loadings	en
dc.subject.other	Flow rules	en
dc.subject.other	Hardening rules	en
dc.subject.other	Kinematic hardening	en
dc.subject.other	Kinematic hardening rule	en
dc.subject.other	Large deviations	en
dc.subject.other	Multi-axial loadings	en
dc.subject.other	Multiaxial ratcheting	en
dc.subject.other	Plastic loading	en
dc.subject.other	Plastic strain increment	en
dc.subject.other	Plasticity model	en
dc.subject.other	Ratcheting	en
dc.subject.other	Single cycle	en
dc.subject.other	Von Mises	en
dc.subject.other	Yield surface	en
dc.subject.other	Hardening	en
dc.subject.other	Kinematics	en
dc.subject.other	Plastic deformation	en
dc.subject.other	Plasticity	en
dc.subject.other	Stress analysis	en
dc.subject.other	Thermodynamics	en
dc.subject.other	Loading	en
dc.title	Multiaxial ratcheting with advanced kinematic and directional distortional hardening rules	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.ijsolstr.2012.06.006	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ijsolstr.2012.06.006	en
heal.publicationDate	2012	en
heal.abstract	Ratcheting is defined as the accumulation of plastic strains during cyclic plastic loading. Modeling this behavior is extremely difficult because any small error in plastic strain during a single cycle will add to become a large error after many cycles. As is typical with metals, most constitutive models use the associative flow rule which states that the plastic strain increment is in the direction normal to the yield surface. When the associative flow rule is used, it is important to have the shape of the yield surface modeled accurately because small deviations in shape may result in large deviations in the normal to the yield surface and thus the plastic strain increment in multi-axial loading. During cyclic plastic loading these deviations will accumulate and may result in large errors to predicted strains. This paper compares the bi-axial ratcheting simulations of two classes of plasticity models. The first class of models consists of the classical von Mises model with various kinematic hardening (KH) rules. The second class of models introduce directional distortional hardening (DDH) in addition to these various kinematic hardening rules. Directional distortion describes the formation of a region of high curvature on the yield surface approximately in the direction of loading and a region of flattened curvature approximately in the opposite direction. Results indicate that the addition of directional distortional hardening improves ratcheting predictions, particularly under biaxial stress controlled loading, over kinematic hardening alone. © 2012 Elsevier Ltd. All rights reserved.	en
heal.journalName	International Journal of Solids and Structures	en
dc.identifier.doi	10.1016/j.ijsolstr.2012.06.006	en
dc.identifier.volume	49	en
dc.identifier.issue	22	en
dc.identifier.spage	3063	en
dc.identifier.epage	3076	en