PUNCTURE IMPACT BEHAVIOR OF GLASS PLATE FITTED WITH A POLYMERIC FILM

摘要

Glass plates are used extensively as windows in structures, cars, and airplanes. However, because it is a brittle material with low practical strength, improving its resistance to puncture impact loading is important for safety and security. Although it is known that fitting a polymeric film to the glass plate is an easy and effective way to reinforce it against impact loads, the effect of the film fitting has not enough been evaluated quantitatively. In this study, puncture impact behavior was investigated with a glass plate fitted with a polymeric film. When the general puncture impact testing method is applied to a glass plate, the measured load profile would be intensely oscillated by resonance. Therefore, in this study, the modified testing method utilizing the steel incident bar was adopted. By dropping the steel weight, impact loads were applied to the glass plate with the film through the steel incident bar. The applied impact load was estimated from the strain gauge outputs at the incident bar. The stress distribution and crack propagation in the thickness direction of the specimen were observed using the photoelastic method and shadowgraph method with the high-speed video camera. The numerical analysis model capable of reproducing the experiment was built. The obtained load-displacement curves did not include vibrations because of resonance. By the method used in this study, it is possible to quantitatively evaluate the effect of film-fitting on the glass plate.