Weibull Parameters and the Tensile Strength of Porous Phosphate Glass‐Ceramics

The strengths of porous phosphate glass‐ceramic specimens, with relative densities ranging between 0.25 and 0.50, were measured by four‐point bending at room temperature. An analysis of the data, using Weibull statistics, indicated that such a treatment, usually performed on dense ceramics, can also be used on porous materials. In the sets studied, the nature of critical flaws was determined, which led to the proposal of a mechanism of fracture initiation in such porous materials.