Effect of fatigue and annual rings' orientation on mechanical properties of wood under cross-grain uniaxial compression

A. Miksic (Corresponding Author), M. Myntti, J. Koivisto, Lauri Salminen, M. Alava

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

The mechanics of fresh wood with and without a fatigue pre-treatment that mimics a mechanical pulping process was experimentally studied. The mechanical properties of Norway spruce samples under compression are considered with the macroscopic stress–strain data and from local strain properties via digital image correlation technique. The results highlight the effects of the orientation of the wood annual rings compared to the loading direction and of the pre-fatigue. The wood presents a low yield point when the annual rings are tilted compared to the load axis, but the Young’s modulus and yield stress are higher when the annual rings are either parallel or perpendicular to the load direction. In the last case, buckling of softest layers occurs. The fatigue treatment makes the wood less stiff as deduced from the decreases of Young’s modulus and yield stress, whatever the orientation of annual rings. Secondly, it creates a thin and localized softened layer.
Original languageEnglish
Pages (from-to)1117-1133
JournalWood Science and Technology
Volume47
Issue number6
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

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wood mechanical properties
fatigue
mechanical property
Wood
Compaction
compression
Fatigue of materials
Mechanical properties
Young modulus
modulus of elasticity
Yield stress
mechanical pulping
Elastic moduli
buckling
digital images
digital image
mechanics
Picea abies
mechanical properties
Buckling

Cite this

Miksic, A. ; Myntti, M. ; Koivisto, J. ; Salminen, Lauri ; Alava, M. / Effect of fatigue and annual rings' orientation on mechanical properties of wood under cross-grain uniaxial compression. In: Wood Science and Technology. 2013 ; Vol. 47, No. 6. pp. 1117-1133.
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Effect of fatigue and annual rings' orientation on mechanical properties of wood under cross-grain uniaxial compression. / Miksic, A. (Corresponding Author); Myntti, M.; Koivisto, J.; Salminen, Lauri; Alava, M.

In: Wood Science and Technology, Vol. 47, No. 6, 2013, p. 1117-1133.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Myntti, M.

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AU - Salminen, Lauri

AU - Alava, M.

PY - 2013

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AB - The mechanics of fresh wood with and without a fatigue pre-treatment that mimics a mechanical pulping process was experimentally studied. The mechanical properties of Norway spruce samples under compression are considered with the macroscopic stress–strain data and from local strain properties via digital image correlation technique. The results highlight the effects of the orientation of the wood annual rings compared to the loading direction and of the pre-fatigue. The wood presents a low yield point when the annual rings are tilted compared to the load axis, but the Young’s modulus and yield stress are higher when the annual rings are either parallel or perpendicular to the load direction. In the last case, buckling of softest layers occurs. The fatigue treatment makes the wood less stiff as deduced from the decreases of Young’s modulus and yield stress, whatever the orientation of annual rings. Secondly, it creates a thin and localized softened layer.

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