Experiment-based Inverse/Identification Method And Research On Adhesive Interfacial Mechanics Properties

Adhesive structures have been widely used for technological applications. In order to analyze and estimate the mechanical properties of real adhesive structures, it is necessary to characterize and predict the interfacial mechanical properties. With the development of modern experimental mechanics, the full-field measuring information can be obtained during the interfacial mechanical experiments. However, it is difficult in determining the adhesive interfacial parameters directly from the experimental results. At the same time, based on the development of interfacial mechanical model, theory of the adhesive interfacial mechanical analysis can be provided. Consequently, a new solving technique is developed based on the results of experimental measurement, which can effectively characterize and solve nonlinear, multi-parameter problems, through combining the experimental measurement and numerical simulation. The focus of this paper is to study on the experiment-based inverse/identification method and time-dependent adhesive interfacial mechanical characterization.Based on the experimental measurement data, a novel experiment-based inverse/identification technique is presented. Combining the mechanical model and inverse/identification technique, the bridge between the data space with the model analysis is constructed for identifying the complex interfacial mechanical parameters. Finally, independent experimental verification is performed and the accuracy of the identification results can be effectively provided by comparing the independent experimental results with the numerical simulation based on the identification parameters.In this paper, the experiment-based inverse/identification technique is applied to the study of time-dependent interfacial mechanical properties in metal adhesive structure and soft material adhesive structure. First, to describe the time-dependent interfacial mechanical properties in adhesive structure, a novel time-dependent adhesive interfacial mechanical model is provided based on the Needleman cohesive zone model. In this model, the complex adhesive interfacial properties can be characterized as three interfacial parameters, such as cohesive strength, cohesive stiffness and vicious coefficient. Meanwhile, based on the real-time full-field experimental results, combing the numerical simulation results on the basis of the time-dependent adhesive interfacial model and identification technique, the interfacial mechanical parameters under the normal tension and shear loading can be identified. As a result, it is easy to overcome the difficulty of measuring the interfacial mechanical properties in adhesive structure experiment directly. Finally, from the general results of interfacial mechanical properties in soft and mental adhesive structures under tension and shear loading respectively, it is verified that the novel adhesive interfacial model proposed in this paper and the experiment-based inverse/identification are effective to characterize the mechanical properties of the real adhesive structures in technological application.