Deformation kinetics based rheological model for the time-dependent and moisture induced deformation of wood

Antti Hanhijärvi

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)

Abstract

A new general rheological model for the calculation of the creep of wood is presented. The flow equation derived in the theory of molecular deformation kinetics is adjusted to account for creep flow, moisture content change induced swelling/shrinkage and their combined effect by making an assumption that both of these processes activate the same bond breaking and reforming process.
The rheological model is built by making the dashpots in a generalised Maxwell material model to obey the adjusted flow equation and by placing an additional swelling/shrinkage component to each parallel Maxwell element. Two calculated examples of the performance of the model with comparisons to experiment results are given.
It seems that an explanation for the mechano-sorptive effect can be found at the coupling of the creep deformation process and moisture swelling/shrinkage and the non-linearity of the phenomena.
Original languageEnglish
Pages (from-to)191-199
JournalWood Science and Technology
Volume29
Issue number3
DOIs
Publication statusPublished - 1995
MoE publication typeA1 Journal article-refereed

Fingerprint

Wood
Moisture
shrinkage
moisture
swelling
creep
Swelling
kinetics
Creep
Kinetics
Reforming reactions
nonlinearity
moisture content
water content
experiment
Experiments
effect

Cite this

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title = "Deformation kinetics based rheological model for the time-dependent and moisture induced deformation of wood",
abstract = "A new general rheological model for the calculation of the creep of wood is presented. The flow equation derived in the theory of molecular deformation kinetics is adjusted to account for creep flow, moisture content change induced swelling/shrinkage and their combined effect by making an assumption that both of these processes activate the same bond breaking and reforming process. The rheological model is built by making the dashpots in a generalised Maxwell material model to obey the adjusted flow equation and by placing an additional swelling/shrinkage component to each parallel Maxwell element. Two calculated examples of the performance of the model with comparisons to experiment results are given. It seems that an explanation for the mechano-sorptive effect can be found at the coupling of the creep deformation process and moisture swelling/shrinkage and the non-linearity of the phenomena.",
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Deformation kinetics based rheological model for the time-dependent and moisture induced deformation of wood. / Hanhijärvi, Antti.

In: Wood Science and Technology, Vol. 29, No. 3, 1995, p. 191-199.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Deformation kinetics based rheological model for the time-dependent and moisture induced deformation of wood

AU - Hanhijärvi, Antti

PY - 1995

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AB - A new general rheological model for the calculation of the creep of wood is presented. The flow equation derived in the theory of molecular deformation kinetics is adjusted to account for creep flow, moisture content change induced swelling/shrinkage and their combined effect by making an assumption that both of these processes activate the same bond breaking and reforming process. The rheological model is built by making the dashpots in a generalised Maxwell material model to obey the adjusted flow equation and by placing an additional swelling/shrinkage component to each parallel Maxwell element. Two calculated examples of the performance of the model with comparisons to experiment results are given. It seems that an explanation for the mechano-sorptive effect can be found at the coupling of the creep deformation process and moisture swelling/shrinkage and the non-linearity of the phenomena.

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