Abstract
Describing quantitatively the response of laminated glass to low-velocity (~5 m/s) impacts by rigid bodies is an important issue because of its significance in terms of structural degradation and integrity, key parameters for people safety and anti-intrusion performances. This study aims to address the formation of cracks during graveling and steel ball drop tests, so, two well-instrumented experimental set-ups are proposed to study cracking in reproducible conditions. The first device can be seen as a mini-Hopkinson bar system, which from two strain gauges, allows to estimate force and velocity at a sharp indent tip. The second device, reproducing a blunt impact, exploits stereo-Digital Image Correlation (D.I.C.) measurements of the laminated glass surface.
Highlights
Laminated glass is a composite material, built with two or more glass plies, interleaved with polymer layers
The laminated glass behavior is complex, and its impact performance depends on many parameters
Low adhesion could lead to large glass chips splintering during impact, but too high adhesion prevents a good dissipation of impact energy, leading to tearing of the polymer layer
Summary
Laminated glass is a composite material, built with two or more glass plies, interleaved with polymer layers. The laminated glass behavior is complex, and its impact performance depends on many parameters. The adhesion between PVB and glass sheets is one of the most significant parameters in terms of performance with respect to users safety. A large number of experiments in different configurations are needed. To certify their products, the glass manufacturers must pass normalized tests (e.g. European norms for building application, EN 356 and EN 12600).
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