Long-term laminated glass four point bending test with PVB, EVA and SG interlayers at different temperatures

Abstract

This paper presents the results of long term experiments of four point bending test with structural laminated glass plates. For experiments 6 mm thick annealed Soda-Lime-Silica Glass and three different interlayer laminates were used: Polyvinyl butyral (PVB), Ethylene vinyl acetate (EVA), DuPont's SentryGlas (SG). These types of laminates were chosen because there is a wide range of their possible practical application in buildings’ constructions. Bending creep tests were carried out by applying the four point bending test model. Applied dimensions of the laminated glass plates and loading scheme are from the standard EN 1288-3. Three specimens were tested with the same interlayer laminated glass plates. Tests were successively carried out at three temperatures: + 20 °C, + 30 °C, + 40 °C. Every test took 24 hours interval at each temperature, so in total one full experiment took 72 hours with one type of interlayer. The deflections at the middle of specimens, volatile displacement between two glass sheets and longitudinal strains at the middle of the laminated plate were measured. In the paper the comparisons of the experimental results between the glass panels with various laminates and at different temperatures are presented.