Accession Number : ADA115318

Title :   Chemical Durability Improvement and Static Fatigue of Glasses.

Descriptive Note : Annual rept. no. 4, 1 Feb 81-30 Apr 82,

Corporate Author : RENSSELAER POLYTECHNIC INST TROY NY DEPT OF MATERIALS ENGINEERING

Personal Author(s) : Tomozawa,Minoru

PDF Url : ADA115318

Report Date : May 1982

Pagination or Media Count : 43

Abstract : Series of investigaions were made on the relation between the surface conditions of high silica glass and its mechanical strength. It was found that, (1) Heavy alkaline-earth elements such as Sr Ba in alkaline solutions tend to deposit on the silica glass surface and produce severe surface cracks, reducing the mechanical strength. (2) Surface energy of the glass appears to determine the mechanical strength of high silica glass. (3) Dissolution rate of high silica glass in water increases with increasing hydrostatic pressure. This appears inconsistent with the stress-corrosion theory. (4) Crack blunting of high silica glass involves dissolution and precipitation process. (5) Surface condition of high silica glass influences the stress-rate dependence of the mechanical strength. (Author)

Descriptors :   *GLASS, *STATIC TESTS, *FATIGUE(MECHANICS), *ENDURANCE(GENERAL), THEORY, CHEMICALS, ALKALINITY, ALKALINE EARTH METALS, STRENGTH(MECHANICS), SILICA GLASS, SURFACE PROPERTIES, HYDROSTATIC PRESSURE, STRESS CORROSION, SURFACE ENERGY, CRACKS, PRECIPITATION

Subject Categories : Ceramics, Refractories and Glass
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE