Shear Compression Testing of Glass-Fibre Steel Specimens After 4K Reactor Irradiation: Present Status and Facility Upgrade
The shear strengths of various fibre reinforced resins being promising candidate insulators for superconducting coils to be used under a strong radiation load, e.g. in future fusion reactors were investigated prior and subsequent to reactor in-core irradiation at liquid helium temperature. A large number of sandwich-like (steel-bonded insulation-steel) specimens representing a widespread variety of materials and preparation techniques was exposed to irradiation doses of up to 5 × 107 Gy in form of fast neutrons and γ-radiation. In a systematic study several experimental parameters including irradiation dose, postirradiation storage temperature and measuring temperature were varied before the determination of the ultimate shear strength. The results obtained from the different tested materials are compared. In addition an upgrade of the in-situ test rig installed at the Munich research reactor is presented, which allows combined shear/compression loading of low temperature irradiated specimens and provides a doubling of the testing rate.
KeywordsBurning Boron Helium Epoxy Liquefaction
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