Perpendicular-to-grain creep of Finnish softwoods in high temperature drying conditions

Experiments and modelling in temperature range 95 - 125 °C

Antti Hanhijärvi

Research output: Book/ReportReportProfessional

2 Citations (Scopus)

Abstract

This publication reports the results obtained in a project to clarify the perpendicular-to-grain mechanical properties of spruce (Picea abies) and pine (Pinus sylvestris) in high temperature drying conditions. The work consisted of a literature review, an extensive experimental programme and development of a new constitutive model for the description of the creep behaviour in the high temperature conditions. All these tasks are documented in this publication. The experimental work consisted of tension creep experiments at constant saturated (green) condition at constant temperatures 95, 110 and 125°C and in drying conditions of maximum reached temperature 95, 110 or 125°C. From these experiments a large amount of data was obtained about shrinkage, hygrothermal deformation, modulus of elasticity, viscoelastic creep and mechano-sorptive creep. A limited strength test series was also carried out on spruce at 95 and 125°C. For the use of the obtained knowledge in computational simulation of drying stresses a constitutive model of the creep behaviour was developed for the high temperature conditions. The new model is based on linear shrinkage and on using the time temperature moisture-content superposition principle for modelling elastic and viscoelastic strain. For mechano-sorptive creep a new type of model is introduced, where the developing strain is partly recoverable and partly not.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages95
ISBN (Electronic)951-38-5042-0
ISBN (Print)951-38-5041-2
Publication statusPublished - 1997
MoE publication typeNot Eligible

Publication series

NameVTT Publications
PublisherVTT
No.301
ISSN (Print)1235-0621
ISSN (Electronic)1455-0849

Fingerprint

drying temperature
softwood
temperature
shrinkage
Picea
drying
strength (mechanics)
modulus of elasticity
Pinus sylvestris
Picea abies
mechanical properties
Pinus
water content
testing

Keywords

  • softwoods
  • spruce wood
  • pine wood
  • creep properties
  • high temperature tests
  • drying tests

Cite this

Hanhijärvi, A. (1997). Perpendicular-to-grain creep of Finnish softwoods in high temperature drying conditions: Experiments and modelling in temperature range 95 - 125 °C. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 301
Hanhijärvi, Antti. / Perpendicular-to-grain creep of Finnish softwoods in high temperature drying conditions : Experiments and modelling in temperature range 95 - 125 °C. Espoo : VTT Technical Research Centre of Finland, 1997. 95 p. (VTT Publications; No. 301).
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abstract = "This publication reports the results obtained in a project to clarify the perpendicular-to-grain mechanical properties of spruce (Picea abies) and pine (Pinus sylvestris) in high temperature drying conditions. The work consisted of a literature review, an extensive experimental programme and development of a new constitutive model for the description of the creep behaviour in the high temperature conditions. All these tasks are documented in this publication. The experimental work consisted of tension creep experiments at constant saturated (green) condition at constant temperatures 95, 110 and 125°C and in drying conditions of maximum reached temperature 95, 110 or 125°C. From these experiments a large amount of data was obtained about shrinkage, hygrothermal deformation, modulus of elasticity, viscoelastic creep and mechano-sorptive creep. A limited strength test series was also carried out on spruce at 95 and 125°C. For the use of the obtained knowledge in computational simulation of drying stresses a constitutive model of the creep behaviour was developed for the high temperature conditions. The new model is based on linear shrinkage and on using the time temperature moisture-content superposition principle for modelling elastic and viscoelastic strain. For mechano-sorptive creep a new type of model is introduced, where the developing strain is partly recoverable and partly not.",
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Perpendicular-to-grain creep of Finnish softwoods in high temperature drying conditions : Experiments and modelling in temperature range 95 - 125 °C. / Hanhijärvi, Antti.

Espoo : VTT Technical Research Centre of Finland, 1997. 95 p. (VTT Publications; No. 301).

Research output: Book/ReportReportProfessional

TY - BOOK

T1 - Perpendicular-to-grain creep of Finnish softwoods in high temperature drying conditions

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PY - 1997

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N2 - This publication reports the results obtained in a project to clarify the perpendicular-to-grain mechanical properties of spruce (Picea abies) and pine (Pinus sylvestris) in high temperature drying conditions. The work consisted of a literature review, an extensive experimental programme and development of a new constitutive model for the description of the creep behaviour in the high temperature conditions. All these tasks are documented in this publication. The experimental work consisted of tension creep experiments at constant saturated (green) condition at constant temperatures 95, 110 and 125°C and in drying conditions of maximum reached temperature 95, 110 or 125°C. From these experiments a large amount of data was obtained about shrinkage, hygrothermal deformation, modulus of elasticity, viscoelastic creep and mechano-sorptive creep. A limited strength test series was also carried out on spruce at 95 and 125°C. For the use of the obtained knowledge in computational simulation of drying stresses a constitutive model of the creep behaviour was developed for the high temperature conditions. The new model is based on linear shrinkage and on using the time temperature moisture-content superposition principle for modelling elastic and viscoelastic strain. For mechano-sorptive creep a new type of model is introduced, where the developing strain is partly recoverable and partly not.

AB - This publication reports the results obtained in a project to clarify the perpendicular-to-grain mechanical properties of spruce (Picea abies) and pine (Pinus sylvestris) in high temperature drying conditions. The work consisted of a literature review, an extensive experimental programme and development of a new constitutive model for the description of the creep behaviour in the high temperature conditions. All these tasks are documented in this publication. The experimental work consisted of tension creep experiments at constant saturated (green) condition at constant temperatures 95, 110 and 125°C and in drying conditions of maximum reached temperature 95, 110 or 125°C. From these experiments a large amount of data was obtained about shrinkage, hygrothermal deformation, modulus of elasticity, viscoelastic creep and mechano-sorptive creep. A limited strength test series was also carried out on spruce at 95 and 125°C. For the use of the obtained knowledge in computational simulation of drying stresses a constitutive model of the creep behaviour was developed for the high temperature conditions. The new model is based on linear shrinkage and on using the time temperature moisture-content superposition principle for modelling elastic and viscoelastic strain. For mechano-sorptive creep a new type of model is introduced, where the developing strain is partly recoverable and partly not.

KW - softwoods

KW - spruce wood

KW - pine wood

KW - creep properties

KW - high temperature tests

KW - drying tests

M3 - Report

SN - 951-38-5041-2

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BT - Perpendicular-to-grain creep of Finnish softwoods in high temperature drying conditions

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Hanhijärvi A. Perpendicular-to-grain creep of Finnish softwoods in high temperature drying conditions: Experiments and modelling in temperature range 95 - 125 °C. Espoo: VTT Technical Research Centre of Finland, 1997. 95 p. (VTT Publications; No. 301).