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

Keywords

  • wood
  • hygro-thermal
  • pyrolysis

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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 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). https://open.lnu.se/index.php/compwood