Stress Generation in Laminated Glass Plates

Joji Suetomi, Shin Omi, Kazutoshi Nakaya, Dr. Shin'ichi Aratani

Laminated glasses have been used as windows for their safety properties. Recently, demands for thinner laminated glass have been increasing for the conservation of natural resource and the save of energy. From the point of view, the values of stress generation in thinner laminated glass are very important for considering the safety properties. One of authors reported the stress generation values with the sample of 3 mm thick glass + PVB film + 3 mm thick glass. However, the stress generation values with a thinner sample like 2 mm thick gkass + PVB film + 2 mm thick glass doesn't have been reported yet. In order to investigate the stress generation in various laminated glass, measurements of stress were attempted by ring on ring method. Laminated glass plates of 2 mm thick glass + PVB film + 2 mm thick glass were used as specimens. In addition, numerical analysis was done by the solid model.

As the results, the relationship between stress and loading velocity was recognized at 284 K but the stress at 294 K and 302 K was not changed by loading velocity. It was also recognized that the stress of 30 mil laminated glass was larger than that of 60 mil laminated glass at 284 K. These phenomena were caused by the visco-elastic characteristic of laminated film.

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