ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The fracture of an alumina containing 5% by volume of glass phase has been studied over the temperature range 20 to 900° C. Peaks in fracture stress andK Ic at elevated temperatures have been confirmed to arise from softening of the glass phase by determining the temperature dependence of the viscosity of a glass of identical composition to that occurring in the ceramic. Observations of fracture surface show glass protrusions at temperatures of the peak in strength orK Ic indicating the viscous stretching of glass particles bridging the opposite crack surfaces and a simple model considering the energy dissipated in this process is presented. The peaks in strength andK Ic arise from this energy dissipation rather than from blunting of the crack.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00556093
