Novel treatment methods for improving fatigue behavior of laminated glass

摘要

The use of laminated glasses (LG) is increasing day-by-day in the fatigue prone structures. In the present work, the pre- and post-breakage behavior of LG was improved for the fatigue loading via five novel thermo-chemical treatment methods. The fatigue life of LG samples was evaluated using the standard bending cyclic fatigue test. The prime goal of the treatment methods was to bring the surfaces of LG samples in the compressive state without causing melting or bubbling of interlayer having a melting temperature lesser than 150 degrees C. A comparison of treatment methods based on cyclic fatigue strength (CFS) of LG was reported. Further, a theoretical explanation for improved fatigue life was presented. The life of LG samples was increased by more than 40% by one of the treatment methods. The finite element (FE) model was developed to calculate the deformations and stresses for the corresponding number of cycles at which LG samples were fractured. Further, the FE model was extending to consider the residual stresses profile due to different treatments before modeling the effect of cyclic fatigue loading. The strain-life and stress-life relations were established using experimental and modeling results. The crack propagation and fracture of LGs were explained using previously established models and correlated with the effect of treatment. The statistical analysis was conducted for ensuring the validity of the results.