The mechanical behaviour of laminated glass is strongly affected by the polymeric interlayer placed between layers. In general, this a viscoelastic material, and therefore it may experience creep stress relaxation when subjected for an extended period to constant or strain respectively. study, seven different commercial materials (EVALAM, EVASAFE, PVB BG-R20, Saflex DG-41, ES, SentryGlas, TPU) ...