Finite element modelling of impact damage in polyvinyl butyral laminated glass

摘要

Automotive laminated glass is normally comprised of two soda-lime glass sheets bonded with one plastic interlayer, polyvinyl butyral (PVB). Glass-ply cracking is the principal damage pattern in PVB laminated glass under low-velocity impact. The purpose of this work is to numerically investigate the glass-ply cracking mechanism in the framework of cohesive zone modelling. Toward this end, the glass-ply cracking is modelled via an extrinsic cohesive model. Besides, a laminated glass model is proposed, in which brick elements are adopted and an intrinsic cohesive formulation is employed to model the adhesion between glass and PVB. The nonlinear characteristic of PVB is described by using a Mooney-Rivlin constitutive model. Then, the glass-ply cracking behaviours of a laminated glass beam under drop-weight impact are simulated. The proposed approach is qualitatively validated by comparing the simulation results with the experimental observations. In the simulation, the propagations of stress waves of the laminated glass beam during the crack process are illustrated, and the glass-ply cracking mechanism is revealed. Finally, the effects of the PVB film and the adhesion on glass-ply cracking are investigated. (C) 2015 Elsevier Ltd. All rights reserved.