Deformation properties of Finnish spruce and pine wood in tangential and radial directions in association to high temperature drying. Part IV: Modelling

Antti Hanhijärvi

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

The set of papers (Part I-IV) sums up the results of an extensive project to quantify primarily the creep characteristics but also other deformation properties of Norway spruce (Picea abies) and Scots pine (Pinus sylvestris) wood under conditions relevant in the high temperature drying process. The programme included tension experiments on perpendicular specimens at temperatures 95 °C–125 °C. Based on the experiments, a constitutive model to describe the behaviour was developed for use in numerical simulation of drying stresses and is reported in this paper. The model takes into account all the needed strain terms: hygroexpansion (shrinkage, swelling), hygrothermal, elastic, viscoelastic and mechano-sorptive strains. Elastic and viscoelastic strains are modelled jointly as generalised Kelvin material, using the time–temperature–moisture-content superposition principle. Mechano-sorptive creep is modelled with a series of modified `mechano-sorptive Kelvin elements', in which a part of the strain is irrecoverable unless the direction of the acting stress changes.
Original languageEnglish
Pages (from-to)211-216
JournalHolz als Roh- und Werkstoff
Volume58
Issue number4
DOIs
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

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drying temperature
creep
Picea
Wood
Drying
Pinus
stress change
swelling
Pinus sylvestris
Picea abies
modeling
Creep
experiment
Temperature
Constitutive models
shrinkage
simulation
Swelling
temperature
drying

Cite this

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title = "Deformation properties of Finnish spruce and pine wood in tangential and radial directions in association to high temperature drying. Part IV: Modelling",
abstract = "The set of papers (Part I-IV) sums up the results of an extensive project to quantify primarily the creep characteristics but also other deformation properties of Norway spruce (Picea abies) and Scots pine (Pinus sylvestris) wood under conditions relevant in the high temperature drying process. The programme included tension experiments on perpendicular specimens at temperatures 95 °C–125 °C. Based on the experiments, a constitutive model to describe the behaviour was developed for use in numerical simulation of drying stresses and is reported in this paper. The model takes into account all the needed strain terms: hygroexpansion (shrinkage, swelling), hygrothermal, elastic, viscoelastic and mechano-sorptive strains. Elastic and viscoelastic strains are modelled jointly as generalised Kelvin material, using the time–temperature–moisture-content superposition principle. Mechano-sorptive creep is modelled with a series of modified `mechano-sorptive Kelvin elements', in which a part of the strain is irrecoverable unless the direction of the acting stress changes.",
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year = "2000",
doi = "10.1007/s001070050415",
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pages = "211--216",
journal = "European Journal of Wood and Wood Products",
issn = "0018-3768",
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Deformation properties of Finnish spruce and pine wood in tangential and radial directions in association to high temperature drying. Part IV : Modelling. / Hanhijärvi, Antti.

In: Holz als Roh- und Werkstoff, Vol. 58, No. 4, 2000, p. 211-216.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

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T2 - Modelling

AU - Hanhijärvi, Antti

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N2 - The set of papers (Part I-IV) sums up the results of an extensive project to quantify primarily the creep characteristics but also other deformation properties of Norway spruce (Picea abies) and Scots pine (Pinus sylvestris) wood under conditions relevant in the high temperature drying process. The programme included tension experiments on perpendicular specimens at temperatures 95 °C–125 °C. Based on the experiments, a constitutive model to describe the behaviour was developed for use in numerical simulation of drying stresses and is reported in this paper. The model takes into account all the needed strain terms: hygroexpansion (shrinkage, swelling), hygrothermal, elastic, viscoelastic and mechano-sorptive strains. Elastic and viscoelastic strains are modelled jointly as generalised Kelvin material, using the time–temperature–moisture-content superposition principle. Mechano-sorptive creep is modelled with a series of modified `mechano-sorptive Kelvin elements', in which a part of the strain is irrecoverable unless the direction of the acting stress changes.

AB - The set of papers (Part I-IV) sums up the results of an extensive project to quantify primarily the creep characteristics but also other deformation properties of Norway spruce (Picea abies) and Scots pine (Pinus sylvestris) wood under conditions relevant in the high temperature drying process. The programme included tension experiments on perpendicular specimens at temperatures 95 °C–125 °C. Based on the experiments, a constitutive model to describe the behaviour was developed for use in numerical simulation of drying stresses and is reported in this paper. The model takes into account all the needed strain terms: hygroexpansion (shrinkage, swelling), hygrothermal, elastic, viscoelastic and mechano-sorptive strains. Elastic and viscoelastic strains are modelled jointly as generalised Kelvin material, using the time–temperature–moisture-content superposition principle. Mechano-sorptive creep is modelled with a series of modified `mechano-sorptive Kelvin elements', in which a part of the strain is irrecoverable unless the direction of the acting stress changes.

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