Skip to main content
Log in

Dislocations in single hemp fibres—investigations into the relationship of structural distortions and tensile properties at the cell wall level

  • Published:
Journal of Materials Science Aims and scope Submit manuscript

Abstract

The relationship between dislocations and mechanical properties of single hemp fibres (Cannabis sativa L. var. Felina) was studied using a microtensile testing setup in a 2-fold approach. In a first investigation the percentage of dislocations was quantified using polarized light microscopy (PLM) prior to microtensile testing of the fibres. In a second approach PLM was used to monitor the dislocations while straining single fibres. The first part of the study comprised 53 hemp fibres with up to 20% of their cell wall consisting of dislocations. For this data set the percentage of dislocations did not affect the mechanical properties. In the second part of the study it was found that dislocations disappeared during tensile testing, and that they did not reappear until several weeks after failure. A strain stiffening effect due to the straightening of the dislocations was not observed. It is possible that the former positions of the dislocations functioned as locations for crack initiation. However, the crack does not propagate transversely all the way trough the dislocation but results in a shear failure between the microfibrils. In rheological studies fibres were strained at constant stress levels, and dislocations that had disappeared did not reappear during that period.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Subscribe and save

Springer+ Basic
EUR 32.99 /Month
  • Get 10 units per month
  • Download Article/Chapter or Ebook
  • 1 Unit = 1 Article or 1 Chapter
  • Cancel anytime
Subscribe now

Buy Now

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5

Similar content being viewed by others

References

  1. Nyholm K, Ander P, Bardage S, Daniel G (2001) Nordic Pulp Paper Res J 4:376

    Google Scholar 

  2. Hughes M, Sèbe G, Hague J, Hill C, Spear M, Mott L (2000) Composite Interfaces 7:13

    Article  CAS  Google Scholar 

  3. Bos HL, Van Den Oever MJA, Peters OCJJ (2002) J Mater Sci 37:1683

    Article  CAS  Google Scholar 

  4. Bos HL, Donald AM (1999) J Mater Sci 34:3029

    Article  CAS  Google Scholar 

  5. Baley C (2004) J Mater Sci 39:331

    Article  CAS  Google Scholar 

  6. Focher B, Marzetti A, Sharma HSS (1992) In: Sharma HSS, Van Sumere CF (eds) The biology and processing of flax, M. Publications, Belfast, p 333. Cited from [Hughes M, Sebe G, Hague J, Hill C, Spear M, Mott L (2000) Composite Interfaces 7:13]

  7. Koch G, Bauch J, Dünisch O, Seehann G, Schmitt U (1996) Holz Roh Werkst 54:243

    Article  CAS  Google Scholar 

  8. Robinon W (1920) Phil Trans R Soc B 210:49

    Google Scholar 

  9. Page DH, El-Hosseiny F, Winkler K, Bain R (1972) Pulp Paper Mag Can 73(8):72

    Google Scholar 

  10. Davies GC, Bruce DM (1998) Textile Res J 68:623

    CAS  Google Scholar 

  11. Burgert I, Frühmann K, Keckes J, Fratzl P, Stanzl-Tschegg SE (2003) Holzforschung 57:661

    Article  CAS  Google Scholar 

  12. Robson D, Hague J (1995) In: Proceedings of the conference on woodfiber–plastic composites, (Forest Products Society), Madison, Wisconsin USA p 41

  13. Groom L, Mott L, Shaler SM (2002) Wood Fiber Sci 34:14

    CAS  Google Scholar 

  14. Burgert I, Eder M, Frühmann K, Keckes J, Fratzl P, Stanzl-Tschegg SE (2005) Holzforschung 59:354

    Article  CAS  Google Scholar 

  15. Thygesen A (2005) Optimisation and characterisation of hemp fibres needed to go from the plant to fibres in composite materials, Ph.D. Thesis, Risø National Laboratory, Denmark

  16. Kibblewhite RP (1976) Cellulose Chem. Technol 10:497

    Google Scholar 

  17. Ander P, Burgert I, Frühmann K (2003) In: Salmén L (ed) Proceedings of the second international conference of the European society for wood mechanics (ESWM), May 25th–28th, Stockholm, Sweden, p 63

Download references

Acknowledgements

The present study was carried out within the project ‘High Performance Hemp Fibres and Improved Fibre Network for Composites’ financed by the Danish Research Council. LGT thanks COST Action E35 for financing a Short Term Scientific Mission.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Lisbeth G. Thygesen.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Thygesen, L.G., Eder, M. & Burgert, I. Dislocations in single hemp fibres—investigations into the relationship of structural distortions and tensile properties at the cell wall level. J Mater Sci 42, 558–564 (2007). https://doi.org/10.1007/s10853-006-1113-5

Download citation

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10853-006-1113-5

Keywords

Navigation