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A three-dimensional plasticity-damage constitutive model for timber unde cyclic loads

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Title: A three-dimensional plasticity-damage constitutive model for timber unde cyclic loads
Authors: Sirumbal-Zapata, LF
Malaga Chuquitaype, C
Elghazouli, AY
Item Type: Journal Article
Abstract: The performance of timber structures is governed by the nonlinear response at their connections, where high deformation levels and stress concentrations are developed, particularly when subjected to load reversals. To date, no constitutive model for wood under cyclic load exists which is able to incorporate its most important failure modes while considering plastic deformations and cyclic stiffness and strength degradation simultaneously. This paper presents the formulation and implementation of a plasticity- damage model with these characteristics within a continuum mechanics approach. The theoretical framework of both plasticity and damage models is described, and a detailed derivation of the constitutive equations required for their computational implementation and coupling as well as the return mapping and iterative algorithms for their integra- tion are presented. The damage evolution process is handled by two independent scalar variables for tension and compression. A general orthotropic plasticity yield surface with isotropic hardening is employed to incorporate timber plastic flow in compression. A closed-form expression for the plasticity-damage consistent tangent operator is derived. It is demonstrated that the proposed constitutive model captures all the key character- istics required for an accurate modelling of timber under large deformation levels until failure.
Issue Date: 31-Oct-2017
Date of Acceptance: 22-Sep-2017
URI: http://hdl.handle.net/10044/1/51231
DOI: https://dx.doi.org/10.1016/j.compstruc.2017.09.010
ISSN: 0045-7949
Publisher: Elsevier
Start Page: 47
End Page: 63
Journal / Book Title: Computers and Structures
Volume: 195
Copyright Statement: © 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: 09 Engineering
Applied Mathematics
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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