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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
Papers

Abstract

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.

Keywords

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.

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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

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