Appropriate Wood Constitutive Law for Simulation of Nonlinear Behavior of Timber Joints

Xu, Bohan; Bouchaïr, Abdelhamid; Racher, P.

doi:10.1061/(asce)mt.1943-5533.0000905

Cited by 20 publications

(18 citation statements)

References 31 publications

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“…whether in tension or compression). In general, the three most failure modes are [12]: (i)ductile failure due to compression parallel to the grain, (ii) ductile failure due to compression perpendicular to the grain, and (iii) brittle failure due to shear parallel to the grain and tension perpendicular to the grain. Fig.…”

Section: Background On the Nonlinear Behaviour Of Woodmentioning

confidence: 99%

“…Furthermore, its implementation is generally feasible only for discrete crack modelling, which requires an a priori definition of the cracking path severely limiting its applicability to simulate most timber joints (commonly dowelled connections) subject to cyclic loading where the crack locations are not known in advance. The second approach, and the one followed herein, is based on CDM theory [11,12,13] and represents a practical alternative for the definition of a plasticity-damage model for the analysis of timber structures subjected to load reversals.…”

Section: Introductionmentioning

confidence: 99%

“…Brittle failure modes (tension or shear) were not considered by the authors and their model was employed in the analysis of the monotonic response of timber bolted connections. Later, Xu et al [12] developed a timber model based on a combination of anisotropic plasticity with hardening for compression, and a simplified continuous damage model for shear and tension. Hill's yield criterion was used for plasticity, whereas a modified version of the same criterion, considering tension and shear stresses only, was used for the definition of the onset of damage.…”

Section: Introductionmentioning

confidence: 99%

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

Sirumbal-Zapata

Mariotti

Elghazouli

2018

Computers & Structures

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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 sti↵ness and strength degradation simultaneously. This paper presents the formulation and implementation of a plasticitydamage 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 integration 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 characteristics required for an accurate modelling of timber under large deformation levels until failure.

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Section: Background On the Nonlinear Behaviour Of Woodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Sirumbal-Zapata

Mariotti

Elghazouli

2018

Computers & Structures

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“…Although it normally works fine when applied to composite materials, it certainly fails when it is used to simulate the mechanical behaviour of timber because of its different strengths when working under tensile or under compressive stresses. 15,16 In the direction of the grain, under tensile stress, timber shows an elastoplastic behaviour until fibre fracture occurs; while under compressive stress, the failure is caused because the timber cells buckle and collapse. On the other hand, in the directions perpendicular to the grain, under tensile stress, timber fails when the weak links that join the fibres are unable to withstand the stresses, 17 and under compressive stress, a grain-crushing situation appears.…”

Section: Fe Modelmentioning

confidence: 99%

Contact shear stresses in dowel-type joints with expansive kits of timber structures

Fueyo

Domínguez

Cabezas

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper studies the shear stresses appearing in the contact zones of dowel-type joints of timber structures using expansive kits. To achieve this goal, a finite element model capable of determining the effect of using these kits on the global response of the joint has been prepared. For its development, different tools have been used to model the expansion process, the contact between the different parts of the joint, the compression pressures triggered by this contact, the resulting shear stresses caused by friction and, finally, the effect of all these circumstances on the overall performance of the joint, especially on the relationship between the applied load and the related displacement. The design of the model has been checked for correctness using experimental tests. The results obtained show that the use of expansive kits slightly improves the load-carrying capacity of the dowel through the rope effect.

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“…The strength of timber joints has attracted great attention [39]. Xu has developed the wood constitutive law for behavior of timber joints, Hoffman criterion was used in law, experiments and simulation got similar results [40][41]. A key factor in simulation is anisotropy evolution under finite strains.…”

Section: Constitutive Model Of Woodmentioning

confidence: 99%

Advances in the study of mechanical properties and constitutive law in the field of wood research

Zhao¹,

Zhao²,

Han³

2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. This paper presents an overview of mechanical properties and constitutive law for wood. Current research on the mechanical properties of wood have mostly focused on density, grain, moisture, and other natural factors. It has been established that high density, dense grain, and high moisture lead to higher strength. In most literature, wood has been regarded as an anisotropic material because of its fiber. A microscopic view is used in research of wood today, in this way, which has allowed for clear observation of anisotropy. In general, wood has higher strength under a dynamic load, and no densification. The constitutive model is the basis of numerical analysis. An anisotropic model of porous and composite materials has been used for wood, but results were poor, and new constitutions have been introduced. According to the literature, there is no single theory that is widely accepted for the dynamic load. Research has shown that grain and moisture are key factors in wood strength, but there has not been enough study on dynamic loads so far. Hill law has been the most common method of simulation. Models that consider high strain rate are attracting more and more attention.

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Appropriate Wood Constitutive Law for Simulation of Nonlinear Behavior of Timber Joints

Cited by 20 publications

References 31 publications

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

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

Contact shear stresses in dowel-type joints with expansive kits of timber structures

Advances in the study of mechanical properties and constitutive law in the field of wood research

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