窓用飛散防止フィルムを貼付したガラス板のパンクチャー衝撃試験

抄録

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 shatterproof window 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, a puncture impact test was conducted with a glass plate fitted with a shatterproof window 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 displacement of the incident bar was measured using the high-speed video camera. The crack propagation in the thickness direction of the specimen was observed using the shadowgraph method with another high-speed video camera. Then the fracture mode of the glass plate and failure mode of the film were clarified. With the proposed test method in this study, load-displacement curves without oscillations because of resonance were obtained. It was proven that by the method used in this study, it is possible to quantitatively evaluate the effect of film-fitting on the glass plate. The numerical analysis was conducted to verify the obtained load and displacement in the experiment. It was revealed that further improvement is needed in the measuring method for the load and displacement of the incident bar.