Wood Science and Technology

, Volume 32, Issue 3, pp 227–235 | Cite as

A multiple fracture test for strain to failure distribution in wood

  • F. Thuvander
  • L. A. Berglund
Originals

Abstract

The tensile strain to failure of small wood samples is a desirable property in studies where the effect of small differences in microstructure on failure is of interest. However, the scatter in data is usually significant and only one data is obtained per specimen. For this reason, a new multiple fracture test for measurement of the strain to failure distribution was designed. Wood samples were bonded between two transparent PVC layers with higher strain to failure than the wood. Multiple fractures were then observed in single wood samples during tensile loading. This behavior is already utilized in tests in the field of synthetic composite materials. It was possible to conveniently register multiple fracture events as a function of strain by visual observation through the transparent PVC layers. The data were used to compare two different wood materials and to determine their Weibull distribution functions.

Keywords

Microstructure Distribution Function Composite Material Small Difference High Strain 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Chou, Tsu-Wei (1992) Microstructural design of fiber composites. Cambridge University PressGoogle Scholar
  2. Garret KW, Bailey JE (1977a) Multiple transverse fracture in 90° cross-ply laminates of a glass fibre-reinforced polyester. J. Mat. Sci. 12: 157–168Google Scholar
  3. Garret KW, Bailey JE (1977b) The effect of resin failure strain on the tensile properties of glass fibre-reinforced polyester cross-ply laminates. J. Mat. Sci. 12: 2189–2194Google Scholar
  4. Henstenburg RB, Phoenix SL (1989) Interfacial shear strength studies using the singlefilament-composite test. Part II: A probability model and Monte Carlo simulation. Polymer Composites 10: 389Google Scholar
  5. Kelly A, Tyson WR (1965) Tensile properties of fiber-reinforced metals: copper/tungsten and copper/molybdenum, J. Mech. Phys. Solids 13: 329Google Scholar
  6. Kifetew G, Thuvander F, Berglund LA (1998) Effect of drying on wood fracture surfaces from specimens loaded in wet condition. Wood Sci. Technol. 32: 83–94Google Scholar
  7. Manders PW, Chou TW, Jones FR, Rock JW (1983) Statistical analysis of multiple fracture in 0/90/0 glass fibre/epoxy resin laminates. J. Mat. Sci. 18: 2876–2889Google Scholar
  8. Tamuzh VP, Korabel'nikov, YuG, Rashkovan IA, Karklin'sh AA, Gorbatkina, YuA, Zakharova TYu (1991) Determination of scale dependence of strength of fibrous fillers and evaluation of their adhesion to the matrix, based on results of tests of elementary fibers in a polymer block. Mech. Comp. Materials (in Russian) 27: 413–418Google Scholar
  9. Peters PWM (1984) The strength distribution of 90 plies in 0/90/0 graphite-epoxy laminates., J of Composite Materials, 18: 545–556Google Scholar
  10. Thuvander F, Berglund LA, Kifetew G (1998) Modeling of cell wall drying stresses. Wood Sci. Technol. in press.Google Scholar
  11. Yavin B, Gallis HE, Scherf J, Eitan A, Wagner HD (1991) Continuous monitoring of the fragmentation phenomenon in single fiber composite materials. Polymer Composites 12: 436–446Google Scholar

Copyright information

© Springer-Verlag 1998

Authors and Affiliations

  • F. Thuvander
    • 1
  • L. A. Berglund
    • 1
  1. 1.Division of Polymer EngineeringLuleå University of TechnologyLuleåSweden

Personalised recommendations