Fatigue treatment of wood by high-frequency cyclic loading

S. Panula-Ontto, Mikael Lucander, Sari Asikainen, Tiina Pöhler, Erkki Saharinen, T. Björkqvist

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

12 Citations (Scopus)

Abstract

A new tool was used for investigating the qualitative and the quantitative response of wood at high static pressure superposed with a modulated cyclic loading. Wood samples were cyclically stressed with large compression pulses and at frequencies in the range 100-1000 Hz, i.e., at frequencies close to those used in production scale mechanical pulping. The temperature rise in the wood was measured both with thermocouples inserted into the wood and also with a thermographic camera. It was found that a high static load during cyclic loading increased heat generation in the wood. The cyclic loading frequency had less effect than the level of the static loading. However, low frequencies generated more heat after a specific number of impacts. The wood underwent irreversible plastic deformations accompanied by heat generation and increased pore volume in the wood fibre wall microstructure.
Original languageEnglish
Title of host publicationProceedings of a meeting held 6-9 May 2007, Minneapolis, Minnesota
PublisherTAPPI Press
Number of pages7
ISBN (Print)978-1-60560293-6
Publication statusPublished - 2007
MoE publication typeA4 Article in a conference publication
EventInternational Mechanical Pulping Conference, IMPC 2007 - Minneapolis, United States
Duration: 6 May 20079 May 2007

Conference

ConferenceInternational Mechanical Pulping Conference, IMPC 2007
CountryUnited States
CityMinneapolis
Period6/05/079/05/07

Fingerprint

Wood
Fatigue of materials
Heat generation
Pulse compression
Cyclic loads
Thermocouples
Plastic deformation
Cameras
Microstructure
Fibers
Temperature

Cite this

Panula-Ontto, S., Lucander, M., Asikainen, S., Pöhler, T., Saharinen, E., & Björkqvist, T. (2007). Fatigue treatment of wood by high-frequency cyclic loading. In Proceedings of a meeting held 6-9 May 2007, Minneapolis, Minnesota TAPPI Press.
Panula-Ontto, S. ; Lucander, Mikael ; Asikainen, Sari ; Pöhler, Tiina ; Saharinen, Erkki ; Björkqvist, T. / Fatigue treatment of wood by high-frequency cyclic loading. Proceedings of a meeting held 6-9 May 2007, Minneapolis, Minnesota. TAPPI Press, 2007.
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Panula-Ontto, S, Lucander, M, Asikainen, S, Pöhler, T, Saharinen, E & Björkqvist, T 2007, Fatigue treatment of wood by high-frequency cyclic loading. in Proceedings of a meeting held 6-9 May 2007, Minneapolis, Minnesota. TAPPI Press, International Mechanical Pulping Conference, IMPC 2007, Minneapolis, United States, 6/05/07.

Fatigue treatment of wood by high-frequency cyclic loading. / Panula-Ontto, S.; Lucander, Mikael; Asikainen, Sari; Pöhler, Tiina; Saharinen, Erkki; Björkqvist, T.

Proceedings of a meeting held 6-9 May 2007, Minneapolis, Minnesota. TAPPI Press, 2007.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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T1 - Fatigue treatment of wood by high-frequency cyclic loading

AU - Panula-Ontto, S.

AU - Lucander, Mikael

AU - Asikainen, Sari

AU - Pöhler, Tiina

AU - Saharinen, Erkki

AU - Björkqvist, T.

PY - 2007

Y1 - 2007

N2 - A new tool was used for investigating the qualitative and the quantitative response of wood at high static pressure superposed with a modulated cyclic loading. Wood samples were cyclically stressed with large compression pulses and at frequencies in the range 100-1000 Hz, i.e., at frequencies close to those used in production scale mechanical pulping. The temperature rise in the wood was measured both with thermocouples inserted into the wood and also with a thermographic camera. It was found that a high static load during cyclic loading increased heat generation in the wood. The cyclic loading frequency had less effect than the level of the static loading. However, low frequencies generated more heat after a specific number of impacts. The wood underwent irreversible plastic deformations accompanied by heat generation and increased pore volume in the wood fibre wall microstructure.

AB - A new tool was used for investigating the qualitative and the quantitative response of wood at high static pressure superposed with a modulated cyclic loading. Wood samples were cyclically stressed with large compression pulses and at frequencies in the range 100-1000 Hz, i.e., at frequencies close to those used in production scale mechanical pulping. The temperature rise in the wood was measured both with thermocouples inserted into the wood and also with a thermographic camera. It was found that a high static load during cyclic loading increased heat generation in the wood. The cyclic loading frequency had less effect than the level of the static loading. However, low frequencies generated more heat after a specific number of impacts. The wood underwent irreversible plastic deformations accompanied by heat generation and increased pore volume in the wood fibre wall microstructure.

M3 - Conference article in proceedings

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BT - Proceedings of a meeting held 6-9 May 2007, Minneapolis, Minnesota

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Panula-Ontto S, Lucander M, Asikainen S, Pöhler T, Saharinen E, Björkqvist T. Fatigue treatment of wood by high-frequency cyclic loading. In Proceedings of a meeting held 6-9 May 2007, Minneapolis, Minnesota. TAPPI Press. 2007