Advertisement

Enhanced Creep of Epoxy Resin During Irradiation at Cryogenic Temperatures

  • T. Nishiura
  • S. Nishijima
  • S. Ueno
  • Y. Tsukasaki
  • T. Okada
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 44)

Abstract

To investigate the synergistic effects of radiation and stress on mechanical properties, we performed three kinds of creep tests on epoxy resin (before, after, and during high-energy electron-beam irradiation) and two kinds of creep tests on polyethylene (before and during γ-ray irradiation). The simultaneous application of radiation and stress enhanced creep. To clarify the mechanisms of this enhanced creep, we measured the electron spin resonance of three kinds of specimens: (1) stressed, nonirradiated specimens, (2) irradiated specimens, and (3) specimens that were stressed during irradiation. Spins for the specimens stressed during irradiation were about 10 to 30% more than those of the irradiated specimens. In this paper, we discuss the mechanism of creep deformation during irradiation on basis of the experimental results and the molecular dynamics method for a simple molecular model.

Keywords

Electron Spin Resonance Electron Spin Resonance Spectrum Creep Rate Creep Test Creep Curve 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    D. Evans and J.T. Morgan, A review of the effects of ionizing radiation on plastic materials at low temperatures, in “Advances in Cryogenic Engineering (Materials),” vol. 28, Plenum, New York (1982), p. 147.CrossRefGoogle Scholar
  2. 2.
    B. Egusa, Irradiation effects and degradation mechanism on the mechanical properties of polymer matrix composites at low temperatures, in: “Advances in Cryogenic Engineering (Materials),” vol. 36, Plenum, New York (1990), p. 861.Google Scholar
  3. 3.
    M.A. Mokul’skii, Kinetic process in irradiated substances, Vyskomol. Soedin 2(1):119 (1960); also Polym. Sci. USSR 2 (4): 211 (1961).CrossRefGoogle Scholar
  4. 4.
    V.F. Stepanov, S.E. Vaisberg, and V.L. Karpov, Time-to-rupture and creep in radiation field. Fiz. Khim. Mekh. Mater. 15(3):306 (1969); also Soy. Mater. Sci. 237: 24 (1969).Google Scholar
  5. 5.
    M.P Vershinina, V.R. Regel, and N.N. Chernyi, Effect of exposure to ultraviolet light on the strength of polymer, Polym. Sci. USSR 6: 1606 (1964).CrossRefGoogle Scholar
  6. 6.
    D.T. Hill, D.A. Lewis, and J.H. O’Donnel, Accelerated failure of bisphenol-A polysulfone during electron beam irradiation under an applied stress. J. Appl. Polym. Sci. 44: 115 (1992).CrossRefGoogle Scholar
  7. 7.
    J.P. Bell, A.S. Michaels, A.S. Hoffman, and E.A. Mason, Transient acceleration of creep rates of polymers during high-intensity irradiation, Adv. Chem. Soc. 66: 79 (1967).CrossRefGoogle Scholar
  8. 8.
    T. Nishiura, S. Nishijima, K. Katagirii, T. Okada, J. Yasuda, and T. Hirokawa, Radiation damage of composite materials — Creep and swelling, in: “Advances in Cryogenic Engineering (Materials),” vol. 36B, Plenum, New York (1990), p. 885.Google Scholar
  9. 9.
    T. Nishiura, S. Nishijima, K. Katagirii, T. Okada, J. Yasuda, and T. Hirokawa, Creep test of composite materials under irradiation condition, in: “Proc. 11th Int. Conf. on Magnet Technology,” Elsevier, Amsterdam (1990), p. 708.Google Scholar
  10. 10.
    B. Eda and M. Iwasaki, ESR study of radiation damage of bisphenol-A-based epoxy resin at low temperature: selective hydrogene addition to benzene-ring-forming cyclohexadienyl-type radical, J. Polym. Sci. A: Polym. Chem. 24: 2119 (1986).ADSCrossRefGoogle Scholar
  11. 11.
    K.L. DeVries, B.A. Lloyd, and M.L. Williams, Reaction-rate model for fracture in polymeric fibers, J. Appl. Phys. 42: 4644 (1971).ADSCrossRefGoogle Scholar
  12. 12.
    S. Nishijima, T. Nishiura, and T. Okada, Molecular dynamic simulation of a polymeric material at cryogenic temperature, submitted to “Advances in Cryogenic Engineering (Materials),” vol. 44, Plenum, New York (1998).Google Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • T. Nishiura
    • 1
  • S. Nishijima
    • 1
  • S. Ueno
    • 1
  • Y. Tsukasaki
    • 1
  • T. Okada
    • 1
  1. 1.ISIROsaka UniversityIbaraki 567Japan

Personalised recommendations