General mean-field theory to describe compression of thick porous fibre networks

J A Ketoja (Corresponding author), Sara Paunonen, Elina Pääkkönen, Tiina Pöhler, Tero Mäkinen, Juha Koivisto, Mikko Alava

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


We have developed a new theory to analyse the compression-stress behaviour of foam-formed fibre materials. The experimental samples included different fibre and fines types, and they were processed with several different foaming agents. The mechanical testing was supported by simultaneous high-speed imaging and acoustic emission measurements. The theory described well the average stress behaviour upto c.a. 50% compression, despite different densities and raw materials of the samples. Moreover, the relative number of acoustic events followed the predicted proportion of buckled fibre segments for varied strain.
Original languageEnglish
Title of host publicationProgress in Paper Physics Seminar PPPS2020
Subtitle of host publicationBook of abstracts
EditorsJarmo Kouko, Jani Lehto, Tero Tuovinen
Place of PublicationHelsinki
PublisherVTT Technical Research Centre of Finland
ISBN (Electronic)978-951-38-8736-0
ISBN (Print)978-951-38-8738-4
Publication statusPublished - 1 Sep 2020
MoE publication typeNot Eligible
EventProgress in Paper Physics Seminar, PPPS 2020 - Jyväskylä, Finland
Duration: 1 Sep 20203 Sep 2020

Publication series

SeriesVTT Technology


SeminarProgress in Paper Physics Seminar, PPPS 2020
Abbreviated titlePPPS2020


  • fibre network
  • compression
  • stress
  • strain
  • image analysis
  • acoustic emission

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    Ketoja, J. A., Paunonen, S., Pääkkönen, E., Pöhler, T., Mäkinen, T., Koivisto, J., & Alava, M. (2020). General mean-field theory to describe compression of thick porous fibre networks. In J. Kouko, J. Lehto, & T. Tuovinen (Eds.), Progress in Paper Physics Seminar PPPS2020: Book of abstracts (pp. 55-58). VTT Technical Research Centre of Finland. VTT Technology, No. 378