Investigation into Out-of-Plane Deformation and Crack Morphology of Laminated Glass at Full Fracture

This work examines the mechanical properties of fully fractured laminated glass (LG) with emphasis on the out-of-plane deformation and the morphology of the cracks. This study focus on characterizing the initial condition of fully fractured laminated glass LG to aid in evaluating its performance given the severe deterioration as compared to the condition of the glass being intact or only partially fractured. The authors performed fragmentation testing under different conditions (i.e. three different types of interlayers: ionomer (SG), modified ethylene vinyl acetate (PVE®), and PVE/polycarbonate/PVE (SGE®), and at three different temperatures of 20, 50, and 80 degrees Celcius). The authors reported that less out-of-plane deformation of partially fractured LG occurred

after the remaining intact glass ply fractured. Moreover, LG configurations with composite interlayers had higher load-bearing capacity as compared to those with single interlayers. It was also found that the out-of-plane deformation of partially fractured LG helped create more dense fragments in the subsequently fractured glass ply. However, this effect was less at elevated temperatures (i.e. 80)). Here the interlayer lost its stiffness and the interlayer-glass interface lost its adhesion. The authors also reported that the minimum nearest neighbor distance of the fragments of the latter-fractured glass ply was greater than the previously-fractured glass ply under most tested conditions. This study provides invaluable contributions to the under researched area of

laminated glass fracture mechanics under full fracturing of glass.

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