Shear and Compressive Properties of Insulation after Irradiation at 4 K
Following irradiation at 4 K, we measured the shear and compressive properties of candidate insulation systems for ITER toroidal field coils. The insulation systems evaluated (suitable for either vacuum-pressure impregnation or preimpregnation processing) were epoxy, bismaleimide, and polyimide resins with S-2-glass reinforcement; some contained mica and polyimide film barriers. They were exposed to a fast neutron fluence of 1.8 × 1022 n/m2. Results indicated that the shear strength and flexural modulus are more sensitive to irradiation than the compressive strength, modulus, and elongation. Comparison of irradiated materials and of various properties provides insight for selection of insulation systems.
KeywordsCompressive Strength Shear Strength Flexural Modulus Compressive Property Insulation System
Unable to display preview. Download preview PDF.
- 1.R. Reed, P. Fabian, T. Bauer, C. Hazelton, and N. Munshi, Effects of neutron/gamma irradiation at 4 K on shear and compressive properties of insulation, in: “Proceedings of Nonmetallic Materials and Composites at Low Temperatures VII,” to be published in Cryogenics (1995).Google Scholar
- 3.N.J. Simon, “Irradiation Damage in Inorganic Insulation Materials for ITER Magnets: A Review,” NISTIR 5025, National Institute of Standards and Technology, Boulder, Colorado (1994).Google Scholar
- 4.P. Fabian, J. Schutz, C. Hazelton, and R. Reed, “Screening of Candidate Insulation Systems for ITER TF Coils,” Composite Technology Development, Inc. and Cryogenic Materials, Inc. report to MIT Plasma Fusion Center (August 15, 1993).Google Scholar
- 5.P.E. Fabian and R.P. Reed, “Candidate ITER Insulation Materials Characterization Report,” Composite Technology Development, Inc. and Cryogenic Materials, Inc. report to MIT Plasma Fusion Center (January 30, 1994).Google Scholar
- 6.H. Gerstenberg and W. Gläser, Neutron irradiations at temperatures below 6 K at the Munich Research Reactor, Nucl. Sci. Eng. 110:50–55 (1992).Google Scholar