A Study on Impact Strength of Laminated Glass with Initial Crack.

For the windshield of automobiles, laminated glass with bilayer glass of the same thickness and interlayer polyvinyl butyral is usually used. Recently, asymmetrically laminated glass with thinner inside glass is used in order to reduce the weight without loosing the safety. On the other hand, it is well known that the impact strength of the laminated glass is infulenced by the initial crack occurred after car crashed. In this study, the symmetrically and asymmetrically lamineted glass are impacted through the airbag by the striker shot from a special experimental apparatus. The fracture behavior of the laminated glass without and with three types of the initial crack, are observed and compared. Based on the analysis results of the corresponding discrete element models, the impact fracture mechanism of the lamineted glass is investigated.