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Cellulose

, Volume 23, Issue 1, pp 873–889 | Cite as

High strain rate radial compression of Norway spruce earlywood and latewood

  • Carolina S. MoilanenEmail author
  • Tomas Björkqvist
  • Birgitta A. Engberg
  • Lauri I. Salminen
  • Pentti Saarenrinne
Original Paper

Abstract

The mechanical properties of Norway spruce were studied and a compression model for mechanical pulping was developed. The split-Hopkinson pressure bar technique was combined with high-speed photography to analyse local radial compression. Data analysis focussed on the differences between mechanical properties of earlywood and latewood. Measurements were conducted at both room temperature and 135 °C. The effect of pre-fatigue treatment was also studied. A simple material model was defined linearly in parts and fitted to the measurement data to quantify the differences. New results were found on the differences in inelastic behaviour of earlywood and latewood at large deformations. In addition, other results were in line with previously published results.

Keywords

Norway spruce Radial compression Split-Hopkinson pressure bar High-speed photography Local strain 

Notes

Acknowledgments

The Academy of Finland is acknowledged for the funding under decision no. 140462. The Swedish Knowledge Foundation and member companies of the E2MP-Research Profile at Mid Sweden University are also acknowledged for supporting this research. Furthermore, the authors are grateful for the assistance with the measurements from Staffan Nyström and Max Lundström in the Mid Sweden University Material’s Laboratory.

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Carolina S. Moilanen
    • 1
    Email author
  • Tomas Björkqvist
    • 2
  • Birgitta A. Engberg
    • 3
  • Lauri I. Salminen
    • 4
  • Pentti Saarenrinne
    • 1
  1. 1.Department of Mechanical Engineering and Industrial SystemsTampere University of TechnologyTampereFinland
  2. 2.Department of Automation Science and EngineeringTampere University of TechnologyTampereFinland
  3. 3.Department of Chemical EngineeringMid Sweden University-FSCNSundsvallSweden
  4. 4.A Fredrikson Research & Consulting Ltd.JyväskyläFinland

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