Study Of The Interface Mechanical Properties Of Rate-dependent Adhesive Structure

Compared to traditional connection technology between different materials,adhesive bonding major advantages are reducing thermal stress and thermal strain;easy weight loss; low processing cost and clean-looking joints. Therefore, bondingtechnology and the structure has been widely used. Because of the discontinuity of thematerial, the damage of adhesive structure often occurs between bonding interface. Forsafety considerations, characterization and evaluation on interfacial mechanicalproperties of the adhesive structure is very necessary. Numerous studies show that thebonding interface associated with the viscous properties of the loading rate-dependent,and that, the experiment technology is still difficult to measure the rate-dependentmechanical properties parameters of interface directly. While the development of theinterface mechanics model provides theory basis for numerical analysis of adhesivestructure interface mechanics responses. This paper is based on the experimentalresults of adhesive structure, combined with the proper rate-dependent interface finiteelement model, introduce inverse identification techology to study mechanicalproperties of adhesive interface.A interface model considering rate-effect put to use, combined with non-solidfour-node interface element, using ABAQUS UEL interface to program interfaceelements, numerical simulate the damage to the double cantilever beam (DCB) metalbonding specimens in tension normal. On the basis of Needleman and generalizedMaxwell model, the normal tensile failure mechanism characterized by normalcohesive strength, critical separation, viscosity and the second stiffness of the fourparameters. The simulation results show that the model can reflect the rate-effect ofinterface.Based on the experimental results, combing the numerical simulation results andimproved genetic algorithm, the rate-dependent interfacial mechanical parameters ofDCB specimen under the normal tension loading can be identified. By using Matlabprogramming and ABAQUS Python scripting language programming to achieve thefull automation of inversion process, and inversion efficiency was greatly improved. Finally, under the DCB specimen test results with different loading rates, proved theeffectiveness of the rate-effect bonding interface model considered in this paper andinverse identification method in characterizing the interfacial properties.This paper established a rate-dependent interface model which can simultaneoussimulate the interface failure of shear and normal, and fixed arm peeling processsimulation of polyethylene/polybutylene (PE/PB) film with10m.-%iPB-1. Differentgroups of peel rate and peel angle simulation results show that peel force increaseswith the peel rate; peel force as peel angle increases while the ordinal decrease, in the70-120range of peel angle, and the strain energy release rate is almost unchanged.