Identification of time-dependent interfacial mechanical properties of adhesive by hybrid/inverse method

Interfacial mechanical properties of the adhesive bonded interface are strongly time-dependent in most engineering structures due to the viscoelasticity of the adhesive layer. To predict those properties and investigate their effect on the time-dependent adhesive structures, a novel hybrid/inverse identification method is developed in this paper. The method is made up of an optimization technique coupled with a new time-dependent interfacial adhesive model, the interfacial adhesive experiment at various loading rates and the finite element numerical simulation. Based on the interfacial failure results obtained from experiment and the numerical simulation, the hybrid/inverse identifying procedure time-dependent interfacial parameters is constructed by means of genetic algorithms and the time-dependent interfacial adhesive parameters can then determined. In end an independent experiment is presented to verify the reasonableness of the values of the interfacial parameters. The hybrid/inverse identification method is proved to be promising in identifying time-dependent interfacial parameters of adhesive bonded structures.