Wood Science and Technology

, Volume 47, Issue 3, pp 537–555 | Cite as

An original impact device for biomass characterisation: results obtained for spruce and poplar at different moisture contents

  • Floran Pierre
  • Giana Almeida
  • Françoise Huber
  • Philippe Jacquin
  • Patrick Perré
Original

Abstract

This paper describes an experimental device designed to determine the mechanical behaviour of lignocellulosic products subjected to high strain rates. This impact system consists of a moving trolley equipped with an accelerometer, which is thrown against a fixed trolley. The sample is attached to the fixed trolley, and the accelerations of both trolleys during the impact are analysed to obtain stress/strain curves. A high-speed camera synchronised with a high-powered xenon flash records up to 4,000 frames/s. A set of tests on wood samples is described to illustrate the potential of this new device. In particular, the cross-effects of compression rate and moisture content were demonstrated by performing both quasi-static (1 mm min−1 using a conventional testing machine) and dynamic tests (1.7 m s−1 using the impact device). Poplar and spruce samples, equilibrated at three different moisture contents (air-dried, fibre saturation point (FSP) and fully saturated), were tested. Two findings are particularly worthy of mentioning: (1) despite the plasticising role of water, the sample at FSP exhibited a fragile behaviour at the high compression rate, (2) the resistance due to the expulsion of water out of saturated samples can be assessed only by performing an impact test.

Notes

Acknowledgments

This work was financially supported by the ANR project TORBIGAP. The authors are grateful to the personnel of the LERFoB 3B team.

Supplementary material

Supplementary material 1 (MPG 1394 kb)

Supplementary material 2 (MP4 5491 kb)

Supplementary material 3 (MP4 10716 kb)

References

  1. Adalian C, Morlier P (2002) “WOOD MODEL” for the dynamic behaviour of wood in multiaxial compression. Holz Roh- Werkst 60:433–439CrossRefGoogle Scholar
  2. Almeida G, Hernández RE (2006) Changes in physical properties of yellow birch below and above the fiber saturation point. Wood Fiber Sci 38(1):74–83Google Scholar
  3. Dumail JF, Salmèn L (1997) Compression behavior of saturated wood perpendicular to grain under large deformations. Holzforschung 51(4):296–302CrossRefGoogle Scholar
  4. Easterling KE, Harrysson R, Gibson LJ, Ashby MF (1982) On the mechanics of balsa and other woods. Proceed R Soc Lond A 383:31–41CrossRefGoogle Scholar
  5. Eyma F, Méausoone PJ, Larricq P, Marchal R (2005) Utilization of a dynamometric pendulum to estimate cutting forces involved during routing. Comparison with actual calculated values. Ann For Sci 62:441–447CrossRefGoogle Scholar
  6. François P (1992) Plasticity of wood in multiaxial compression: application to the absorption of the mechanical energy (in French) thesis, l’Université Bordeaux IGoogle Scholar
  7. Gerhards CC (1982) Effect of moisture content and temperature on the mechanical properties of wood: an analysis of immediate effects. Wood Fiber 14(1):4–36Google Scholar
  8. Goring DAI (1963) Thermal softening of lignin, hemicellulose and cellulose. Pulp and Paper Canada Magazine T517–T527Google Scholar
  9. Irvine GM (1984) The glass transitions of lignin and hemicellulose and their measurement by differential thermal analysis. Tappi J 67(5):118–121Google Scholar
  10. Mindess S, Sukontasukkul P, Lam F (2004) Fracture of air-dried and fully saturated parallel strand lumber (PSL) under impact loading. Wood Sci Technol 38:227–235CrossRefGoogle Scholar
  11. Perré P (2007) Experimental device for the accurate determination of wood-water relations on micro-samples. Holzforschung 61:419–429CrossRefGoogle Scholar
  12. Perré P, Turner IW (1999) The use of numerical simulation as a cognitive tool for studying the microwave drying of softwood in an over-sized waveguide. Wood Sci Technol 33:445–464CrossRefGoogle Scholar
  13. Placet V, Passard J, Perré P (2007) Differences of the viscoelastic properties of normal and reaction green wood across the grain measured by harmonic tests in the range of 0 °C to 95 °C. Holzforschung 61:548–557CrossRefGoogle Scholar
  14. Placet V, Passard J, Perré P (2008) Viscoelastic properties of wood across the grain measured under water-saturated conditions up to 135 °C: evidence of thermal degradation. J Mater Sci 43:3210–3217CrossRefGoogle Scholar
  15. Reid SR, Peng C (1997) Dynamic uniaxial crushing of wood. Int J Impact Eng 19(5–6):531–570CrossRefGoogle Scholar
  16. Renaud M, Rueff M, Rocaboy AC (1996) Mechanical behaviour of saturated wood under compression. Part 1: behaviour of wood at high rates of strain. Wood Sci Technol 30:153–164CrossRefGoogle Scholar
  17. Siewert TA, Schmieder K (1995) Pendulum impact machines: procedures and specimens for verification. ASTM publications, PhiladelphiaCrossRefGoogle Scholar
  18. Sukontasukkul P, Lam F (2004) Effect of tup geometry on impact behaviour of parallel strand lumber (PSL). J KMITNB 14(2):1–7Google Scholar
  19. Tavares LM, King RP (1998) Single-particle fracture under impact loading. Int J Miner Process 54:1–28CrossRefGoogle Scholar
  20. Wang N, Mindess S, Ko K (1996) Fibre reinforced concrete beams under impact loading. Cement Concrete Res 26(3):363–376CrossRefGoogle Scholar
  21. Widehammar S (2004) Stress-strain relationships for spruce wood: influence of strain rate, moisture content and loading direction. Exp Mech 44(1):44–48CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Floran Pierre
    • 1
  • Giana Almeida
    • 2
    • 3
  • Françoise Huber
    • 4
  • Philippe Jacquin
    • 4
  • Patrick Perré
    • 1
  1. 1.LGPMEcole Centrale ParisChâtenay-MalabryFrance
  2. 2.UMR 1145 Ingénierie Procédés AlimentsAgroParisTechMassyFrance
  3. 3.UMR 1145 Ingénierie Procédés AlimentsINRAMassyFrance
  4. 4.UMR 1092, LERFoB Bois Biomateriaux Biomasse TeamINRANancyFrance

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