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Extensive testing on a variety of glasses to define their mechanical properties was performed. The properties measured were elastic or Young's modulus E, shear modulus ý, and Poisson ratio, v, Vickers and Knoop hardness, H, fracture, ÒF, toughness, Klc, fracture surface energy, ÒF, and additionally drop tests were performed under different conditions (glass temperatures, impact energies, etc.). Different techniques were used, e.g. to determine Klc, Vickers indentation, Hertzian indentation, short rod fractometry and the double torsion method were applied. Some measurements were extended up to the softening point of the glasses.

Though most of the work to be described was performed in an action to develop suitable glasses for solidification (i.e. vitrification) of radioactive waste, other glasses were also investigated to some extent. The "waste glasses" are rather complex borosilicate glasses tailor-made for safe long-term storage of the waste.

Some emphasis was placed on the behavior of glass surfaces and on the effects of different surface treatments. Extensive data were also collected on the effect of humidity, and on property changes due to interaction with water (leaching). In addition, changes due to irradiation (mainly ion bombardment) on the mechanical properties were investigated.

Additional information

Authors: MATZKE H.J, JRC Institute for Transuranium Elements, Karlsruhe (DE)
Bibliographic Reference: An oral report given at the International Conference on Glass Surfaces. Held at: Venice (IT) 6-11 September 2000
Record Number: 200013160 / Last updated on: 2001-03-20
Original language: en
Available languages: en