20.500.12556/RUL-165340 Vpliv priprave površine lepljencev na mehanske lastnosti prekrivnih lepljenih spojev Effect of surface treatment of adherends on mechanical properties of single lap adhesive bonded joints Lepljenje je metoda spajanja materialov, ki se danes uporablja že skoraj v vseh industrijskih panogah, predvsem pa v letalski in avtomobilski industriji. V sklopu diplomske naloge smo raziskovali vpliv različnih priprav površine lepljencev na mehanske lastnosti enojnih prekrivnih lepljenih spojev. V ta namen smo površine lepljencev iz aluminijeve zlitine in nerjavnega jekla očistili z izopropanolom, plazmo s koronskimi razelektritvami in laserjem. Na pripravljenih vzorcih smo izvedli teste omočljivosti in izmerili hrapavost površin. Vzorce smo nato zlepili z enokomponentnim epoksidnim lepilom in izvedli natezne teste. Ugotovili smo, da s čiščenjem površin lepljencev z izopropanolom in laserjem dosežemo skoraj enake strižne trdnosti, medtem ko s plazemsko očiščenimi lepljenci dosežemo najmanjšo trdnost lepljenih spojev. Hrapavost površin se z različnimi pripravami ni bistveno spremenila. Pri testih omočljivosti so bili najmanjši koti omočenja na plazemsko očiščenih vzorcih. Na nobenem porušenem spoju ni bilo 100 % adhezijske ali kohezijske porušitve sloja lepila, prevladoval pa je poseben tip kohezijske porušitve. Na nekaterih porušenih lepljenih spojih smo opazili vrzeli v sloju lepila zaradi zračnih mehurjev. Korelacija med strižnimi trdnostmi, hrapavostjo površin in koti omočenja ni bila zaznana. Adhesive bonding is a method of bonding materials, which is used in almost every industry, especially in aviation and car manufacturing. In this thesis, we investigated the effect of different surface treatments of adherends on mechanical properties of single lap adhesive bonded joints. Therefore, we cleaned the surfaces of aluminium alloy and stainless steel adherends with isopropyl alcohol, corona discharge plasma and laser. On cleaned surfaces of samples we measured contact angles and surface roughness. Then we bonded cleaned samples with one part epoxy adhesive and tested adhesive joints on tensile test machines. The results of tensile tests showed that surfaces cleaned with isopropyl alcohol and laser produced almost the same shear strengths, while adherends cleaned with corona discharge produced lowest shear strengths. Different surface treatments didn't have any major effect on surface roughness of adherends. The lowest contact angles were achieved on surfaces cleaned with corona discharge. None of the adhesive bonds produced 100 % adhesive or cohesive failure of adhesive and we observed a special cohesion failure as the main failure pattern. On some samples there were voids present because of trapped air in adhesive layer. No correlation between shear strengths, surface roughness and wettability was found. lepljenje priprava površin plazemsko čiščenje koronska razelektritev lasersko čiščenje natezni test omočljivost površin hrapavost površin adhesive bonding surface treatment plasma cleaning corona discharge laser cleaning tensile test surface wettability surface roughness true false false Slovenski jezik Angleški jezik Zaključna naloga 2024-12-03 12:42:51 2024-12-03 12:42:59 2025-01-20 11:22:21 0000-00-00 00:00:00 2024 0 0 XX, 59 str. 2024 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.79:669.715(043.2) 270337 223080451 38422.pdf 38422.pdf 1 BA7A0C71CE5098523B7B77CCB2DBDB21 2345f8173ea483d77d5a5586529e5d10af004a19bd79dd2a32303c0e0610971a 5092a337-b16b-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=196451 Fakulteta za strojništvo 0 0 0