Abstract
The mechanical properties of unidirectional flax fibre reinforced unsaturated polyester resin composites were studied with particular emphasis on their tensile deformation behaviour. These materials displayed characteristic non-linear behaviour when loaded parallel to the axis of the fibre, with a distinct knee preceding a drop in stiffness. Further deformation resulted in strain hardening behaviour. Load cycling and acoustic emissions analysis were used to investigate the nature of the knee and it was found that this corresponded with yielding behaviour in the composite. A well-defined yield point could be identified, which in composites of around 60% fibre volume fraction, occurred at a strain of some 0.12% and a tensile stress of 32 MPa. Varying the interfacial properties, through chemical modification of the fibre prior to lamination, was found to have a marked effect upon the onset of yielding and the yield point itself, as well as the deformation and fracture behaviour of the laminate. It is considered that this behaviour is intimately linked to the straining behaviour of the fibre as well as the fibre–matrix interaction and hypotheses to explain the observed behaviour are presented.
Similar content being viewed by others
References
Hull D, Clyne TW (1996) In: An introduction to composite materials. Cambridge University Press, Cambridge
Brown WJ (1947) In: Fabric reinforced plastics. Cleaver-Hume Press Ltd., London
Bos HL, Van den Oever MJA, Peters OCJJ (1997) In: Proceedings of the 4th International Conference on Deformation and Fracture of Composites, Manchester, March, 1997
Mcmullen P (1984) Composites 15(3):222
Bolton AJ (1994) Mat Tech 9(1/2):12
Ivens J, Bos H, Verpoest I (1997) In: Proceedings of Renewable Bioproducts: Industrial Outlets and Research for the 21st Century, EC-symposium at the International Agricultural Center (IAC), Wageningen, The Netherlands, June 1997
Sridhar MK, Basavarajappa G, Kasturi SG, Balasubramanian N (1982) Indian J Textile Res 7:87
Bledzki K, Reihmane S, Gassan J (1996) J Appl Polym Sci 59:1329
Davies GC, Bruce DM (1998) Textile Res J 68(9):623
Wells H, Bowden DH, Macphail I, Pal PK (1980) In: 35th Annual Technical Conference, 1980 Reinforced Plastics/Composites Institute. The Society of the Plastics Industry, Inc., p 1
Roe PJ, Ansell MP (1985) J Mater Sci 20:4015
Sanadi R, Prasad SV, Rohatgi PK (1985) J Sci Ind Res India 44:437
Sanadi R, Rowell RM, Young RA (1993) J Mater Sci 28:6347
Kumar P (1986) Indian J Technol 24:29
O’dell JL (1997) In: Proceedings of the 4th International Conference on Woodfiber-Plastic Composites, Madison, May 1997. Forest Products Society, Madison, p 280
Sèbe G, Cetin NS, Hill CAS, Hughes M (2000) Appl Compos Mater 7:341
Hughes M, Hill CAS, Hague JRB (2002) J Mater Sci 37:4669
Eichhorn SJ, Young RJ (2003) Comp Sci Technol 63:1225
Eichhorn SJ, Young RJ (2004) Comp Sci Technol 64:767
Hughes M, Hill CAS, Sèbe G, Hague JRB, Spear M, Mott L (2000) Compos Interfaces 7(1):13
Zadorecki P, Flondin P (1986) J Appl Polym Sci 31:1699
Bisanda ETN, Ansell MP (1991) Comp Sci Technol 41:165
Gassan J, Bledzki AK (1996) In: 54th Annual Technical Conference. Society of Plastics Engineers, p 2553
Hill CAS, Cetin NS (2000) Int J of Adhes Adhes 20:71
Oksman K (1999) In: Proceedings of the 5th International Conference on Woodfiber-Plastic Composites, Madison, May 1999. Forest Products Society, Madison, p 97
Bos HL, Van den Oever MJA (1999) In: Proceedings of the 5th International Conference on Woodfiber-Plastic Composites, Madison, May 1999, p 79
Hughes JM (2000) On the mechanical properties of bast fibre reinforced thermosetting polymer matrix composites. PhD thesis, University of Wales, Bangor
Guild FJ, Phillips MG, Harris B (1985) J Mater Sci Lett 4:1375
Hull D (1999) In: Fractography: observing, measuring and interpreting fracture surface topography. Cambridge University Press, Cambridge
Chou T-W (1995) In: Concise encyclopaedia of composite materials. Pergamon, Oxford, p 159
Hornsby PR, Hinrichsen E, Tarverdi K (1997) J Mater Sci 32:443
Baley C (2002) Compos Part A-Appl S 33:939
De Teresa SJ, Allen SR, Farris RJ (1992) In: Composite applications: the role of matrix, fiber and interface. VCH Publishers, Inc., New York
Cox HL (1952) Brit J Appl Phys 3:72
Eichhorn SJ, Baillie CA, Zafeiropoulos N, Mwaikambo LY, Ansell MP, Dufresne A, Entwistle M, Herrera-Franco PJ, Escamilla GC, Groom L, Hughes M, Hill C, Rials TG, Wild PM (2001) J Mater Sci 36:2107
Hill CAS, Abdul Khalil HPS (2000) J Appl Polym Sci 78:1685
Sanadi R, Prasad SV, Rohatgi PK (1986) J Mater Sci 21:4299
Grubb DT, Li Z-F (1994) J Mater Sci 29:203
Cook J, Gordon JE (1964) P Roy Soc Lond A Mat 282:508
Acknowledgements
James Carpenter would like to acknowledge, with thanks, financial assistance from the Engineering and Physical Sciences Research Council—EPSRC, in the form of a Case Award for the pursuance of a PhD programme. The authors also wish to extend warm thanks to Dr. Martin Ansell and colleagues at the University of Bath, for the use of their facilities, their assistance and helpful discussions in relation to the acoustic emissions analysis. Grateful thanks are also extended to SANECO for the supply of the flax fibre samples.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Hughes, M., Carpenter, J. & Hill, C. Deformation and fracture behaviour of flax fibre reinforced thermosetting polymer matrix composites. J Mater Sci 42, 2499–2511 (2007). https://doi.org/10.1007/s10853-006-1027-2
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10853-006-1027-2