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Fracture Behavior of Polymers at Cryogenic Temperatures

  • G. Christoph
  • G. Hartwig
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 42)

Abstract

Crack propagation behavior of amorphous polymers, Polycarbonate (PC) and Polymethylmethacrylate (PMMA) has been investigated at 77 K by using Chevron-notched specimens. The deformation rate ranges from 10-8 to 10-4 m/s. For PC a strong, and for PMMA nearly no strain rate dependence of the fracture toughness KIc has been observed. KIc, in addition, is greatly influenced by the environment. For PC, the value of KIc in LN2 is more than twice that in He-gas atmosphere at the same temperature. Also the strain rate dependence is influenced by the environment. It is assumed that for PC the craze formation at the crack tip is enhanced by direct contact with LN2. In addition some data on High Density Polyethylene (HDPE) and Polytetrafluoroethylene (PTFE) at elevated temperatures are given.

Keywords

Plastic Zone Energy Release Rate Crack Opening Displacement Crack Opening Displacement Strain Rate Dependence 
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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References

  1. 1.
    D. Munz, R. T. Bubsey and J. E. Srawley, Compliance and stress intensity coefficients for short bar specimens with Chevron notches, Int. Journ. of Fracture 16: 359 (1980).CrossRefGoogle Scholar
  2. 2.
    N. Brown, A theory for environmental craze yielding of polymers at low temperatures, J. Polym. Sci. 11: 2099 (1973).Google Scholar
  3. 3.
    T. L. Anderson, “Fracture Mechanics,” CRC Press, Boca Raton (1995).Google Scholar

Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • G. Christoph
    • 1
  • G. Hartwig
    • 1
  1. 1.Institute for Material Research IIForschungszentrum KarlsruheKarlsruheGermany

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