, Volume 19, Issue 2, pp 575–579 | Cite as

Significance of fatigue for mechanical defibration

  • Ari SalmiEmail author
  • Lauri I. Salminen
  • Mikael Lucander
  • Edward Hæggström


The fatigue induced by high-frequency cyclic loading on the compressibility and tensile properties of wood and wood cell walls was quantified. The non-elastic behavior of fatigued and reference samples was similar, whereas their elastic behavior differed, as expected. Next, the effects of the dynamic fatigue on the mechanical pulping process were quantified by grinding fatigued and untreated samples and by comparing the paper strength produced by the two pulps against the consumed pulping energy. Pre-introducing fatigue increased the energy efficiency of grinding and may allow designing a more energy efficient mechanical pulping process.


Ultrasound Mechanical defibration Fatigue Materials testing 



We gratefully acknowledge Mr. Jari Leino for his valuable effort in operating the grinder. Valuable discussions with Lic. Phil. Erkki Saharinen and Dr. Tomas Björkqvist are acknowledged. In addition, we thank M.Sc. Toni Antikainen for operating the veneer lathe at the Aalto University. Financial support by Andritz, M-Real, Myllykoski, Stora-Enso, UPM and Tekes is acknowledged.


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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Ari Salmi
    • 1
    • 2
    Email author
  • Lauri I. Salminen
    • 1
  • Mikael Lucander
    • 1
  • Edward Hæggström
    • 2
  1. 1.VTT Technical Research Center of FinlandVTTFinland
  2. 2.Electronics Research Laboratory, Department of Physics, Division of Materials PhysicsUniversity of HelsinkiUniversity of HelsinkiFinland

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