Journal of Materials Science

, Volume 29, Issue 4, pp 861–864 | Cite as

The J-integral technique applied to toughened nylons under impact loading

  • B. A. Crouch
  • D. D. Huang


The J-integral technique has been used to characterize the toughness of two rubber-toughened nylons under impact loading conditions, at impact speeds from 1–3 ms−1, using single-edge-notched three-point bend specimens. A falling weight impact tester was used to generate different amounts of crack growth, allowing the resistance curve (J-R curve) to be constructed using the multi-specimen technique. The technique is experimentally straightforward and permits the toughness characterization of tough materials with relatively small specimens. For a rubber-toughened nylon 66, the resistance curve is very similar to that obtained at quasi-static loading rates, indicating a low dependence of toughness on rate. However, for a rubber-toughened amorphous nylon, a higher resistance curve was obtained under impact conditions than at low loading rates. This result probably indicates a limitation in the test method, rather than a genuine material response.


Impact Loading Loading Rate Resistance Curve Impact Speed Bend Specimen 
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.
    J. G. Williams, “Fracture Mechanics of Polymers” (Ellis Horwood, Chichester, 1984).Google Scholar
  2. 2.
    ASTM E813-87, “Standard Test Method for JIC, A Measure of Fracture Toughness”, Annual Book of ASTM Standards (American Society for Testing and Materials, Philadelphia, PA, 1987) p. 968.Google Scholar
  3. 3.
    “A Testing Protocol for Conducting J-R Curve Tests on Plastics”, edited by G. E. Hale, ESIS Technical Committee for Polymers and Composites (European Structural Integrity Society, 1991).Google Scholar
  4. 4.
    D. D. Huang, in “Elastic-Plastic Fracture Test Methods: The User's Experience” Vol. 2, ASTM STP 1114, edited by J. A. Joyce (American Society for Testing and Materials, Philadelphia, PA, 1991) p. 290.CrossRefGoogle Scholar
  5. 5.
    S. Hashemi and J. G. Williams, J. Mater. Sci. 26 (1991) 621.CrossRefGoogle Scholar
  6. 6.
    G. C. Adams, R. G. Bender, B. A. Crouch and J. G. Williams, Polym. Engng Sci. 30 (1990) 241.CrossRefGoogle Scholar
  7. 7.
    W. Grellmann, S. Seidler and J. Bohse, Kunstsoffe 81 (1991) 157.Google Scholar
  8. 8.
    J. A. Joyce and E. M. Hackett, in “Fracture Mechanics: Seventeenth Volume”, ASTM STP 905, edited by J. A. Joyce (American Society for Testing and Materials, Philadelphia, PA, 1986) p. 741.CrossRefGoogle Scholar
  9. 9.
    T. Vu-Khanh, Polymer 29 (1988) 979.CrossRefGoogle Scholar
  10. 10.
    J. D. Sumpter and C. E. Turner, Int. J. Fract. 9 (1973) 320.CrossRefGoogle Scholar

Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • B. A. Crouch
    • 1
  • D. D. Huang
    • 1
  1. 1.Polymer ProductsE.I. Du Pont de Nemours Inc.WilmingtonUSA

Personalised recommendations