Effect of Moisture Changes on Creep in Wood

Armstrong, L. D.; Kingston, R. S. T.

doi:10.1038/185862c0

Cited by 146 publications

(59 citation statements)

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“…By reinforcing timber with material that has superior properties when it comes to short-and long-term stiffness, the long-term behaviour could be improved and deflection could be reduced. The first recordings of accelerated creep in wood due to varying humidity conditions were described in the 1960s [74]. These recordings were later verified by performing bending tests on small wood specimens in both cyclic and constant humidity [75].…”

Section: Overviewmentioning

confidence: 99%

FRP reinforcement of timber structures

Schober

Harte

Kliger

et al. 2015

Construction and Building Materials

145

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Timber engineering has advanced over recent decades to offer an alternative to traditional materials and methods. The bonding of fibre reinforced plastics (FRP) with adhesives to timber structures for repair and strengthening has many advantages. However, the lack of established design rules has strongly restrained the use of FRP strengthening in many situations, where these could be a preferable option to most traditional techniques. A significant body of research has been carried out in recent years on the performance of FRP reinforced timber and engineered wood products. This paper gives a State of the Art summary of material formulations, application areas, design approaches and quality control issues for practical engineers to introduce on-site bonding of FRP to timber as a new way in design for structural repair and rehabilitation.

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Section: Overviewmentioning

confidence: 99%

FRP reinforcement of timber structures

Schober

Harte

Kliger

et al. 2015

Construction and Building Materials

145

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“…The evolution of creep results from the interactions between the mechanical stress and the internal moisture whose variations cause its acceleration. Much work has been done on the subject since the early 1960s (Armstrong and Kingston, 1960). A review of work was given by Grossman (1976), Morlier (1994), and Hunt (1999).…”

Section: Introductionmentioning

confidence: 99%

Creep in Wood Under Variable Climate Conditions: Numerical Modeling and Experimental Validation

Dubois

Randriambololona

Petit

2005

Mech Time-Depend Mater

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Abstract. This paper deals with the modeling of linear viscoelastic behavior and strain accumulation (accelerated creep) during moisture content changes in timber. A generalized Kelvin-Voigt model is used and associated in series with a shrinkage-swelling element depending on the mechanical and moisture content states of materials. The hygrothermal aging due to climatic variations implies an evolution of rheological parameters depending upon moisture content and temperature. Two distinct viscoelastic laws, one for drying and the other for moistening, are coupled according to the thermodynamic principles when wood is subjected to nonmonotonous moisture variations. An incremental formulation of behavior is established in the finite element program CAST3M (Software developed by C.E.A. (Commissariatá l'Energi Atomique) and an experimental validation from tension creeprecovery tests is presented.

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“…Many experiments have shown that a cyclic variation of the environment increases the creep of wood and wood based products (Armstrong and Kingston 1960;Pittet 1996;Ebrahimzadeh and Mcqeen 1998;Valentin and Chaplain 2002;Chaplin 2006). This phenomenon is often referred to as mechano-sorptive creep (Grossman 1975) and it has direct effects on fracture, time dependent deformation and stress relaxation of wood in structural applications, cardboard boxes, paper, paper-based packing materials and wood-reconstituted panels.…”

Section: Viscoelasticity Of Wood Under Humidity Variationmentioning

confidence: 99%

“…Since the pioneering work of Armstrong and Kingston (1960), numerous investigators studied the origin of this effect (Gibson 1965;Hunt 1984Hunt , 1986Gril 1988), whose contribution has been reviewed by Wang et al (1991). However, the physical mechanisms governing the mechano-sorptive effects remain poorly understood (Hunt and Gril 1996;Hankijä wi and Hunt 1998;Navi et al 2002;Randriambololona 2003).…”

Section: Viscoelasticity Of Wood Under Humidity Variationmentioning

confidence: 99%

Micromechanics of creep and relaxation of wood. A review COST Action E35 2004–2008: Wood machining – micromechanics and fracture

Navi

Stanzl-Tschegg

2008

HFSG

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Wood, like all polymeric materials, shows viscoelastic behaviour. The time dependent behaviour of wood depends on material anisotropy, temperature, moisture and stresses. To predict the behaviour of wood, numerous mathematical models have been developed largely relying on experimental results. In this paper, time dependent viscoelastic behaviour of wood is reviewed under constant and cyclic climatic conditions, separately. More emphasis is given on results obtained in recent years on the behaviour of thin wood tissues, single fibres, thermo-viscoelasticity of wood, influence of hemicelluloses and the modelling of the effect of transient moisture at the molecular level on the mechanical response.

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Effect of Moisture Changes on Creep in Wood

Cited by 146 publications

References 0 publications

FRP reinforcement of timber structures

FRP reinforcement of timber structures

Creep in Wood Under Variable Climate Conditions: Numerical Modeling and Experimental Validation

Micromechanics of creep and relaxation of wood. A review COST Action E35 2004–2008: Wood machining – micromechanics and fracture

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