MODELING OF VHB STRUCTURAL GLAZING TAPE FOR GLAZING SYSTEM ASSEMBLY

摘要

This work demonstrated a process to evaluate the long-term performance of VHB Structural Glazing Tape G23F (VHB G23F) in applications where the glass panels have initial warpage. Glazing panel structures bonded with VHB acrylic foam adhesive tapes were analyzed to evaluate the warpage tolerance and the long term strength of the bond when the panels are not flat upon assembly. To simulate VHB adhesive tapes that exhibit nonlinear elastic and viscoelastic behavior, time- and temperature-dependent material models were developed and incorporated into finite element analysis. Simulations were performed to determine first, the contact pressure at the interface of the adhesive tape and glass panel during the bond assembly process, then the residual stress in the adhesive tape due to spring-back of warped glass panels after the bonding pressure was removed. Based on the residual stress and creep rupture strength data developed in previous work, the long-term bond strength was evaluated. The analysis results indicate that the VHB adhesive bond can accommodate a certain amount of warpage of the glazing panel due to the combination of the adhesive's bond strength and its hyperelastic-viscoelastic properties that enable stress relaxation and reduction of spring-back stress. The results also showed the effect of the warpage on the wet-out pressure and residual stress due to spring-back of the initially warped glass.