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Journal of Materials Science

, Volume 20, Issue 9, pp 3101–3110 | Cite as

The effect of filler particle size and orientation on the impact fracture toughness of a highly filled plasticized polymeric material

  • C. W. Fong
  • R. C. Warren
Papers

Abstract

The effect of particle size and orientation on the inherent fracture toughness of a filled plasticized polymeric material has been determined by application of linear elastic fracture mechanics. Testing was caried out in a three-point bend mode under impact conditions. The material was a triple base gun propellant consisting of a matrix of nitrocellulose plasticized with nitroglycerine and filled with particles of nitroguanidine (NQ). The crystalline NQ was used in the “as-received” form of needles and in a “ground” state. The material containing as-received NQ consistently had a higher fracture toughness than the material with ground NQ, and the toughness was a maximum when the fillers were aligned perpendicularly to the fracture surface. The impact fracture toughness was found to be virtually independent of strain rate over the range from 3 to 90 sec−1.

Seven-perforated cylindrical grains of the material containing as-received and ground NQ crystals, and the grains were tested in a pneumatic gas gun and a Hopkinson bar apparatus. The grains containing the ground NQ have been shown to be generally less resistant to fracture than the grains containing as-received NQ.

Keywords

Fracture Toughness Extrusion Direction Test Span Specimen Axis Nitroguanidine 

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References

  1. 1.
    R. Lantz and A. J. Beardell, International Jahrestagung (ICT, Karlsruhe, Germany, 1982) p. 639.Google Scholar
  2. 2.
    C. W. Fong and B. K. Moy, J. Ballistics 6 (1982) 1410.Google Scholar
  3. 3.
    L. E. Nielsen, “Mechanical Properties of Polymers and Composites” (Marcel Dekker, New York, 1974) Ch. 7.Google Scholar
  4. 4.
    S. Venzi, A. H. Priest and M. J. May, ASTM Special Technical Publication 563 (American Society for Testing and Materials, Philadelphia, 1974) p. 170.Google Scholar
  5. 5.
    J. E. Srawley, “Fracture”, Vol. 4, edited by H. Leibowitz (Academic Press, New York, 1969), Ch. 2.Google Scholar
  6. 6.
    G. P. Marshall, J. G. Williams and C. E. Turner, J. Mater. Sci. 8 (1973) 949.CrossRefGoogle Scholar
  7. 7.
    G. T. Wulf and G. T. Richardson, J. Phys. E: Sci. Instrum. 7 (1973) 167.CrossRefGoogle Scholar
  8. 8.
    W. R. Hoover, ASTM Special Technical Publication 563 (American Society for Testing and Materials, Philadelphia, 1974) p. 203.Google Scholar

Copyright information

© Chapman and Hall Ltd 1985

Authors and Affiliations

  • C. W. Fong
    • 1
  • R. C. Warren
    • 1
  1. 1.Weapons Systems Research LaboratoryDefence Research Centre SalisburyAdelaideAustralia

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