Abstract
Fracture toughness, macroscopic crack growth and dynamic fatigue of glasses of the system 15Na2O-4Al2O3-xB2O3-(81-x)SiO2 are studied. The fracture toughness as a function of B2O3 content correlates to the dependence of elastic modulus which has a maximum between 20 and 30 mol%. The shape of the crack growth curve changes characteristically. Region 1 of the curves normalized toK Ic is shifted to higher crack growth velocities (smallerK I/K Ic values, respectively) for increasing B203 content. The rise of velocity correlates approximately to the dissolution rate of the glasses in water. The determination of the slope in region 1 is problematic, particularly for poorly resistant glasses. The slopen of the crack growth velocity fitted by the power law decreases above 20 mol% B2O3 in correspondence with the results of the dynamic fatigue (23 >n > 7). A clear fatigue limit at one fifth of the inert strength occurs in glasses with B2O3 content above 20 mol%.
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