Investigation on the tensile properties of annealed and chemically strengthened aluminosilicate glass

Inorganic glass is a brittle material and often fails under tension. The tensile properties of annealed and chemically strengthened aluminosilicate glass were investigated in this study. Particularly, the effects of chemical strengthening, strain rate and stress wave were explored. Quasi-static, dynamic uniaxial unidirectional (DUU) and dynamic uniaxial bidirectional (DUB) tests were conducted. The crack initiation and propagation process of specimens was visualized using high-speed cameras and peridynamic modelling. The results showed that cracks initiate at the central area of surfaces and propagate towards specimen interior and loading ends. Tensile strength is positively related to strain rate and the rate effect of annealed specimens is more significant. Stress balance is reached more rapidly in specimens subjected to DUB loading than in those subjected to DUU loading. Dynamic tensile strength is independent of the number of incident waves, due to the fact that the strength of specimens is achieved at the moment of crack initiation. Chemical strengthening is an enhancement on strength and crack density. The effects of strain rate and chemical strengthening on tensile strength were quantified using an empirical formula.