The strengths of individual glass spheres of a commercial soda‐lime‐silica composition were measured in diametral compression for an extensive range of sizes. Standard plots for a two‐parameter Weibull distribution yielded m values of ∼5 over a 400‐fold range of volumes corresponding to a 50‐fold range of surface areas. Various techniques related to the Weibull formulation, including normalization to a single specimen size, were applied to demonstrate the existence of a single flaw population in all of the sphere sizes. Dependence of the strengths on volume flaws for the diametral compression mode of testing was also confirmed.
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Kschinka et al. (1986) studied this question.
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