Journal of Materials Science

, Volume 31, Issue 3, pp 731–740 | Cite as

Toughness and microscopic fracture mechanisms of unfilled and short-glass-fibre-filled poly(cyano arylether)

  • N. S. Choi
  • K. Takahashi


Fracture mechanisms of an advanced high-strength thermoplastic poly(cyano arylether) (PCAE) and its short-glass-fibre (SGF)-reinforced composites have been studied in relation to toughnesses Kc and Jc. Test temperatures were 23 and 100 °C. Reflected and transmitted optical observations were combined with scanning electron microscopy for the fractographic investigation. For unreinforced PCAE tested at 100 °C, the damage area in front of a notch becomes fairly large in size and consists of numerous tensile microfailures around the local plastic yielding zone, as compared with that tested at 23 °C. This resulted in a substantial improvement of Kc and a big increase in Jc. Filling fibres, however, produced both toughening and anti-toughening results: effects of fibre spanning, pull-out and bridging across the local plastic failure zone and zigzag propagation of fracture due to fibre filling, improved the toughness. However, adhesive failure at the fibre-matrix interface, tensile microcleavage at the fibre ends and straightforward fracture in the skin layer, considerably diminished the values of Kc and Jc, except for the trend of Kc at 23 °C.


Skin Layer Local Plastic Optical Observation Plastic Yielding Failure Zone 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    N. J. JOHNSTON, T. W. TOWELL and P. M. HERGENROTHER, in “Thermoplastic Composite Materials”, edited by L. A. CARLSSON (Elsevier Science, Amsterdam, 1991) p. 27.Google Scholar
  2. 2.
    N. S. CHOI and K. TAKAHASHI, Compos. Sci. Technol. 43 (1992) 237.CrossRefGoogle Scholar
  3. 3.
    D. E. SPAHR, K. FRIEDRICH, J. M. SCHULTZ and R. S. BAILEY, J. Mater. Sci. 25 (1990) 4427.CrossRefGoogle Scholar
  4. 4.
    V. B. GUPTA, R. K. MITTAL and M. GOEL, Compos. Sci. Technol. 37 (1990) 353.CrossRefGoogle Scholar
  5. 5.
    M. FUJII, N. S. CHOI and K. TAKAHASHI, Adv. Compos. Mater. 4 (1994) 47.CrossRefGoogle Scholar
  6. 6.
    J. KARGER-KOCSIS and K. FRIEDRICH, Polymer 27 (1986) 1753.CrossRefGoogle Scholar
  7. 7.
    K. FRIEDRICH, L. A. CARLSSON, J. W. GILLESPIE Jr and J. KARGER-KOCSIS, in “Thermoplastic Composite Materials”, edited by L. A. CARLSSON (Elsevier Science Publishers, Amsterdam, 1991) p. 233.Google Scholar
  8. 8.
    F. RAMSTEINER and R. THEYSOHN, Compos. Sci. Technol. 24 (1985) 231.CrossRefGoogle Scholar
  9. 9.
    N. SATO, T. KURAUCHI, S. SATO and O. KAMIGAITO, J. Compos. Mater. 22 (1988) 850.CrossRefGoogle Scholar
  10. 10.
    J. KARGER-KOCSIS and K. FRIEDRICH, Compos. Sci. Technol. 32 (1988) 293.CrossRefGoogle Scholar
  11. 11.
    K. TAKAHASHI and N. S. CHOI, J. Mater. Sci. 26 (1991) 4648.CrossRefGoogle Scholar
  12. 12.
    S. NAGOH, N. S. CHOI and K. TAKAHASHI, Adv. Compos. Mater. 3 (1994) 191.CrossRefGoogle Scholar
  13. 13.
    Catalogue from Idemitzu Kosan Co. (1992).Google Scholar
  14. 14.
    H. NISHITANI, H. NOGUCHI, Y. H. KIM and T. YAMAGUCHI, J. Soc. Mater. Sci. Jpn 41 (1992) 740 (in Japanese).CrossRefGoogle Scholar
  15. 15.
    D. P. JONES, D. C. LEACH and D. R. MOORE, Polymer 26 (1985) 1385.CrossRefGoogle Scholar
  16. 16.
    N. S. CHOI and K. TAKAHASHI, J. Mater. Sci. Lett. 12 (1993) 1718.CrossRefGoogle Scholar
  17. 17.
    J. KARGER-KOCSIS, in “Application of Fracture Mechanics to Composite Materials”, edited by K. FRIEDRICH (Elsevier Science, Amsterdam, 1989) p. 189.CrossRefGoogle Scholar
  18. 18.
    W. F. BROWN Jr and J. E. SRAWLEY, ASTM STP 410 (American Society for Testing and Materials, Philadelphia, PA, 1966) p. 13.Google Scholar
  19. 19.
    J. R. RICE, P. C. PARIS and J. G. MERKLE, ASTM STP 536 (American Society for Testing and Materials, Philadelphia, PA, 1973) p. 231.Google Scholar
  20. 20.
    E. J. KRAMER, in “Crazing in Polymers”, edited by H. H. KAUSCH (Springer, Berlin, 1983) p. 1.Google Scholar
  21. 21.
    D. HULL, in “Polymeric Materials”, edited by E. BAER (ASM, Cleveland, OH, 1975) p. 487.Google Scholar
  22. 22.
    N. S. CHOI, K. TAKAHASHI and K. HOSHINO, NDT E Int. 25 (1992) 271.CrossRefGoogle Scholar
  23. 23.
    A. J. KINLOCH and R. J. YOUNG, “Fracture Behaviour of Polymers” (Applied Science, London, 1983) p. 95.Google Scholar
  24. 24.
    R. WARREN and V. K. SARIN, in “Application of Fracture Mechanics to Composite Materials”, edited by K. FRIEDRICH (Elsevier Science Amsterdam, 1989) p. 571.CrossRefGoogle Scholar

Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • N. S. Choi
    • 1
  • K. Takahashi
    • 1
  1. 1.Research Institute for Applied MechanicsKyushu UniversityFukuokaJapan

Personalised recommendations