2018 Volume 18 Issue 2 Pages 103-109
The impact resistance improvement is important for glass members which are functional material in optics. It was reported that sticking a thin polymeric film on the glass plate is an effective way to easily reinforce the glass plates against impact loads. However, the reinforcing effect is not enough evaluated quantitatively. In this paper, impact fracture behavior was investigated with a glass plate stuck with thin polymeric film. An impact experiment was conducted using drop weight with a steel bar for the incidence of the impact load to a glass plate. In the experimental result of glass plate without film, stuck with film (3.2% thickness of the glass plate) and tempered glass plate, it was revealed the toughness for the fracture initiation was 12% improved by film sticking. Moreover, it was implied the fracture strength is not necessarily in proportion to the decrease of kinetic energy of the colliding object after fracture since it was largest with film stuck glass plate, nevertheless, the fracture strength was highest with a tempered glass plate. Furthermore, a proposal was made for the further improvement of the impact resistance by sticking thin film based on the investigation of the fracture mode of the glass plate.
