A numerical and experimental methodology to investigate morphological changes in wood exposed to fire temperatures

Stefania Fortino, Aleksi Rinta-Paavola, Robert Pecenko, Tomaz Hozjan, Antti Paajanen, Jukka Vaari, Simo Hostikka

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

    Abstract

    In the last decade, there was an increasing interest in developing hygro-thermal models including also pyrolysis but the topic is still challenging above the charring temperatures.
    In the present paper, the responses of 0.5×0.5×1cm spruce samples heated in a furnace under helium flow are investigated. To understand the effects of different charring temperatures on the material microstructure of wood, SEM pictures are taken from cuts made by a razorblade on perpendicular to grain wood sections. The morphological variations of vessels and wood cell layers are observed and discussed in relation to the corresponding increments of temperature and mass losses. These increments are evaluated by means of a multiphase hygro-thermal model including pyrolysis. Most relevant morphological changes are found for temperatures above 300 ⁰C. In addition, to observe morphological changes for temperatures below 300 ⁰C, microstructural finite element analyses (μFEM) [3] are carried out by taking into account thermal expansion and mass loss of cell walls.
    Original languageEnglish
    Title of host publicationCompWood 2019, Book of Abstracts
    Subtitle of host publicationInternational Conference on Computational Methods in Wood Mechanics – from Material Properties to Timber Structures, ECCOMAS Thematic Conference
    EditorsThomas K. Bader, Josef Fussl, Anders Olsson
    Place of PublicationVäxjö
    Pages20-20
    Number of pages1
    ISBN (Electronic)978-91-88898-64-7
    Publication statusPublished - 2019
    MoE publication typeNot Eligible
    EventCompWood 2019, International Conference on Computational Methods in Wood Mechanics-from Material Properties to Timber Structures - Växjö, Sweden
    Duration: 17 Jun 201919 Jun 2019

    Conference

    ConferenceCompWood 2019, International Conference on Computational Methods in Wood Mechanics-from Material Properties to Timber Structures
    CountrySweden
    CityVäxjö
    Period17/06/1919/06/19

    Fingerprint

    Wood
    Fires
    Pyrolysis
    Temperature
    Cells
    Thermal expansion
    Helium
    Furnaces
    Microstructure
    Scanning electron microscopy
    Hot Temperature

    Keywords

    • wood
    • hygro-thermal
    • pyrolysis

    Cite this

    Fortino, S., Rinta-Paavola, A., Pecenko, R., Hozjan, T., Paajanen, A., Vaari, J., & Hostikka, S. (2019). A numerical and experimental methodology to investigate morphological changes in wood exposed to fire temperatures. In T. K. Bader, J. Fussl, & A. Olsson (Eds.), CompWood 2019, Book of Abstracts: International Conference on Computational Methods in Wood Mechanics – from Material Properties to Timber Structures, ECCOMAS Thematic Conference (pp. 20-20). Växjö.
    Fortino, Stefania ; Rinta-Paavola, Aleksi ; Pecenko, Robert ; Hozjan, Tomaz ; Paajanen, Antti ; Vaari, Jukka ; Hostikka, Simo. / A numerical and experimental methodology to investigate morphological changes in wood exposed to fire temperatures. CompWood 2019, Book of Abstracts: International Conference on Computational Methods in Wood Mechanics – from Material Properties to Timber Structures, ECCOMAS Thematic Conference . editor / Thomas K. Bader ; Josef Fussl ; Anders Olsson. Växjö, 2019. pp. 20-20
    @inbook{72ba052e1b524cbe8aaa003250c07aae,
    title = "A numerical and experimental methodology to investigate morphological changes in wood exposed to fire temperatures",
    abstract = "In the last decade, there was an increasing interest in developing hygro-thermal models including also pyrolysis but the topic is still challenging above the charring temperatures.In the present paper, the responses of 0.5×0.5×1cm spruce samples heated in a furnace under helium flow are investigated. To understand the effects of different charring temperatures on the material microstructure of wood, SEM pictures are taken from cuts made by a razorblade on perpendicular to grain wood sections. The morphological variations of vessels and wood cell layers are observed and discussed in relation to the corresponding increments of temperature and mass losses. These increments are evaluated by means of a multiphase hygro-thermal model including pyrolysis. Most relevant morphological changes are found for temperatures above 300 ⁰C. In addition, to observe morphological changes for temperatures below 300 ⁰C, microstructural finite element analyses (μFEM) [3] are carried out by taking into account thermal expansion and mass loss of cell walls.",
    keywords = "wood, hygro-thermal, pyrolysis",
    author = "Stefania Fortino and Aleksi Rinta-Paavola and Robert Pecenko and Tomaz Hozjan and Antti Paajanen and Jukka Vaari and Simo Hostikka",
    year = "2019",
    language = "English",
    pages = "20--20",
    editor = "Bader, {Thomas K.} and Josef Fussl and Anders Olsson",
    booktitle = "CompWood 2019, Book of Abstracts",

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    Fortino, S, Rinta-Paavola, A, Pecenko, R, Hozjan, T, Paajanen, A, Vaari, J & Hostikka, S 2019, A numerical and experimental methodology to investigate morphological changes in wood exposed to fire temperatures. in TK Bader, J Fussl & A Olsson (eds), CompWood 2019, Book of Abstracts: International Conference on Computational Methods in Wood Mechanics – from Material Properties to Timber Structures, ECCOMAS Thematic Conference . Växjö, pp. 20-20, CompWood 2019, International Conference on Computational Methods in Wood Mechanics-from Material Properties to Timber Structures , Växjö, Sweden, 17/06/19.

    A numerical and experimental methodology to investigate morphological changes in wood exposed to fire temperatures. / Fortino, Stefania; Rinta-Paavola, Aleksi; Pecenko, Robert; Hozjan, Tomaz; Paajanen, Antti; Vaari, Jukka; Hostikka, Simo.

    CompWood 2019, Book of Abstracts: International Conference on Computational Methods in Wood Mechanics – from Material Properties to Timber Structures, ECCOMAS Thematic Conference . ed. / Thomas K. Bader; Josef Fussl; Anders Olsson. Växjö, 2019. p. 20-20.

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

    TY - CHAP

    T1 - A numerical and experimental methodology to investigate morphological changes in wood exposed to fire temperatures

    AU - Fortino, Stefania

    AU - Rinta-Paavola, Aleksi

    AU - Pecenko, Robert

    AU - Hozjan, Tomaz

    AU - Paajanen, Antti

    AU - Vaari, Jukka

    AU - Hostikka, Simo

    PY - 2019

    Y1 - 2019

    N2 - In the last decade, there was an increasing interest in developing hygro-thermal models including also pyrolysis but the topic is still challenging above the charring temperatures.In the present paper, the responses of 0.5×0.5×1cm spruce samples heated in a furnace under helium flow are investigated. To understand the effects of different charring temperatures on the material microstructure of wood, SEM pictures are taken from cuts made by a razorblade on perpendicular to grain wood sections. The morphological variations of vessels and wood cell layers are observed and discussed in relation to the corresponding increments of temperature and mass losses. These increments are evaluated by means of a multiphase hygro-thermal model including pyrolysis. Most relevant morphological changes are found for temperatures above 300 ⁰C. In addition, to observe morphological changes for temperatures below 300 ⁰C, microstructural finite element analyses (μFEM) [3] are carried out by taking into account thermal expansion and mass loss of cell walls.

    AB - In the last decade, there was an increasing interest in developing hygro-thermal models including also pyrolysis but the topic is still challenging above the charring temperatures.In the present paper, the responses of 0.5×0.5×1cm spruce samples heated in a furnace under helium flow are investigated. To understand the effects of different charring temperatures on the material microstructure of wood, SEM pictures are taken from cuts made by a razorblade on perpendicular to grain wood sections. The morphological variations of vessels and wood cell layers are observed and discussed in relation to the corresponding increments of temperature and mass losses. These increments are evaluated by means of a multiphase hygro-thermal model including pyrolysis. Most relevant morphological changes are found for temperatures above 300 ⁰C. In addition, to observe morphological changes for temperatures below 300 ⁰C, microstructural finite element analyses (μFEM) [3] are carried out by taking into account thermal expansion and mass loss of cell walls.

    KW - wood

    KW - hygro-thermal

    KW - pyrolysis

    M3 - Conference abstract in proceedings

    SP - 20

    EP - 20

    BT - CompWood 2019, Book of Abstracts

    A2 - Bader, Thomas K.

    A2 - Fussl, Josef

    A2 - Olsson, Anders

    CY - Växjö

    ER -

    Fortino S, Rinta-Paavola A, Pecenko R, Hozjan T, Paajanen A, Vaari J et al. A numerical and experimental methodology to investigate morphological changes in wood exposed to fire temperatures. In Bader TK, Fussl J, Olsson A, editors, CompWood 2019, Book of Abstracts: International Conference on Computational Methods in Wood Mechanics – from Material Properties to Timber Structures, ECCOMAS Thematic Conference . Växjö. 2019. p. 20-20