Determination of fracture toughness of adhesive bonds

Ovaj rad bavi se eksperimentalnim određivanjem energije loma ljepila putem DCB testa te rekreiranjem izvedenog testa u numeričkom modelu. U početnim poglavljima dan je teorijski pregled ljepila, njihovih primjena u autoindustriji, standardiziranih testova za stvaranje materijalne kartice ljepila, kao i kohezivnih elemenata u programu Abaqus u kojem se radio numerički model. Nakon toga je dan pregled eksperimentalno provedenog DCB testa u kojem se opisala procedura testiranja i analizirali dobiveni rezultati. Naposlijetku, zadnje poglavlje bavi se numeričkim modelom u kojem je cilj što je preciznije moguće rekreirati eksperimentalno dobivene rezultate.This thesis deals with determining the fracture energy of an adhesive experimentally by DCB test and recreating the experiment in numerical model. Opening chapters describe the theoretical overview of adhesives, adhesives’ application in automotive industry, standardized tests for creating material cards of adhesives, as well as an overview of cohesive elements in Abaqus software in which numerical model was made. After that, an overview of an experimentally carried out DCB test is provided, along with the test procedure and results analysis. Finally, the last chapter concerns the numerical model with the goal of recreating experimentally obtained results as precise as possible