BEHAVIOUR OF TIMBER-GLASS COMPOSITES WITH SILICONE ADHESIVE UNDER CONSTANT LOAD

Magistrsko delo obravnava raziskovalno tematiko, ki je del nadaljevalnega projekta na temo nosilnih leseno-steklenih kompozitov preteklega evropskega projekta WoodWisdom-Net. Magistrsko delo obravnava silikonsko gumo kot adhezivni material med steklom in lesom. Pri dolgotrajni obtežbi je pomembno razumevanje odziva materiala pod konstantno obtežbo in trajne pomike v konstrukciji, ki lahko povzročijo porušitev. Glavni cilj magistrskega dela je določiti maksimalno dolgotrajno strižno obtežbo, katera ne privede do pretrganja adheziva. Pri eksperimentalni analizi smo na 82 majhnih leseno-steklenih preizkušancih preiskali obnašanje silikona (OTTOCOLL®S 660) pri dolgotrajni strižni obremenitvi. Med enoletnimi preiskavami so bili izvedeni strižni preizkusi in preiskava lezenja pri kontrolirani spremenljivi klimi. Rezultati analize so pokazali, da lezenje silikonskega adheziva zmanjšuje strižno trdnost in strižni modul. Kontrolirana spremenljiva klima pospešuje lezenje adheziva. Izračunali smo 53 % višji modifikacijski faktor za dolgoročno obnašanje adhezivov, kot ga določa ETAG 002.This master thesis deals with research theme, which is a part of a follow-up project regarding load-bearing timber glass composites within the past EU program WoodWisdom-Net. Master thesis deals with silicone rubber as an adhesive between glass and timber parts. By long-term load is important to understand a response of the material under a constant load and permanent displacements in the structure, which can cause failure. The main aim of this master thesis is to determinate the maximum constant shear load, which does not lead to the failure of the adhesive. In the experimental study we studied the behaviour of silicone (OTTOCOLL®S 660) on 82 small timber-glass specimens by a constant shear stress loading. During 1 year investigation we carried out shear and creep tests at controlled variable climate. Results of the analysis showed that creep of silicone adhesive reduces the shear strength and shear modulus. Controlled variable climate accelerates creep of the adhesive. We calculated 53 % higher value of modification factor for long-term behaviour of adhesives as according to ETAG 002