Vacuum melting and mechanical testing of simulated lunar glassesLunar silicate glasses may possess superior mechanical properties compared to terrestrial glasses because the anhydrous lunar environment should prevent hydrolytic weakening of the strong Si-O bonds. This hypothesis was tested by melting, solidifying, and determining the fracture toughness of simulated mare and highlands composition glasses in a high vacuum chamber. The fracture toughness, K(IC), of the resulting glasses was obtained via microindentation techniques. K(IC) increased as the testing environment was changed from air to a vacuum of 10 exp -7 torr. However, this increase in toughness may not result solely from a reduction in the hydrolytic weakening effect; the vacuum-melting process produced both the formation of spinel crystallites on the surfaces of the glass samples and significant changes in the compositions which may have contributed to the improved K(IC).
Carsley, J. E. (Michigan Technological Univ. Houghton, United States)
Blacic, J. D. (Los Alamos National Lab. NM, United States)
Pletka, B. J. (Michigan Technological Univ. Houghton, United States)
August 16, 2013
January 1, 1992
Publication: In: Engineering, construction, and operations in space III: Space '92; Proceedings of the 3rd International Conference, Denver, CO, May 31-June 4, 1992. Vol. 2 (A93-41976 17-12)
Lunar And Planetary Exploration
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IDRelationTitle19930057979Collected WorksEngineering, Construction, and Operations in Space III