Numerical modeling of structural adhesive bond of fiber reinforced polyester and steel

Z večanjem uporabe kompozitnih materialov se povečuje pomembnost alternativnih pristopov k spajanju, saj tradicionalne metode spajanja v glavnem za kompozite niso primerne. Z namenom modeliranja adhezivnega spoja vlakensko ojačanega poliestra in jekla se v nalogi analizirajo pristopi k numeričnemu modeliranju adhezivnih strukturnih spojev. V začetku je izveden pregled teorij adhezije in glavnih družin strukturnih adhezivov. Temu sledi pregled pristopov k numerični implementaciji adhezivnih spojev. Pri tem je poudarek na metodi kohezivne cone - CZM. Na osnovi zahtev spoja izbranega tubularnega ohišja iz kompozita in jekla je izbran ustrezen adheziv. Za tem je zastavljena eksperimentalna postavitev za določitev parametrov metode CZM, ki omogoča variacijo debeline adhezivnega spoja. Na osnovi eksperimentalnih parametrov so snovani numerični modeli za ponovitev eksperimentov. Na koncu so na osnovi primerjave rezultatov numeričnih in eksperimentalnih testov numerični pristopi ovrednoteni in za izbran adheziv ter adherenta je določen najbolj ustrezen numeričen pristop znotraj metode CZM.With ever growing usage of composite materials, the importance of alternative fastening methods increases because traditional fastening methods are usually not adequate for use on composites. For the purpose of modeling the adhesive joint of fiber reinforced polyester and steel, the numerical approaches on modeling of the adhesive structural joints are analyzed. The overview of the theories of adhesion and the primary groups of structural adhesives is carried out initially. It is followed by an examination of the approaches on numerical implementations of adhesive joints. The emphasis is placed on the cohesive zone modeling - CZM approach. For the selected requirements of the bond of selected composite tubular housing and steel, the suitable adhesive is chosen. Following this, the experimental layout is designed in order to measure parameters for CZM while enabling variation of adhesive bond thickness. On the basis of experimental parameters, numerical models for repetition of the tests are developed. Finally, based on the results of numerical and experimental tests, the numerical approaches are rated for chosen adhesive and adherents and the most suitable approach based on the CZM is determined