Research On The Buckling Behavior Of Film/Substrate Structures In Dielectric Elastomer Based Flexible Electronic Systems

Various electronics products emerge as the rapid development of advanced technology and new products come out constantly. However, disadvantages of traditional electronic devices have appeared with the wide application of electronic devices.Under this background, the new generation flexible electronic technology has been developed, producingdevices with favorable toughness and ductility, ability to be deformed arbitrarily, and capability to withstand repeated tension, bend, or even fold.The so-called flexible electronic technologyis a novel technology that manufacturesorganic or inorganic electronic devices on flexible substrates. Flexible electronic devices have advantages that beyond comparison with traditional devices. For example, such devices are flexible and stretchable, and there is no change in their electrical properties underlarge mechanical deformation.This dissertation investigated the buckling behaviors of a film/substrate structure which is common in flexible electronic device systems, through theoretical analysis, numerical stimulation and experimental verification. Firstly, the buckling/post-buckling behaviors of film/substrate structures in flexible electronic systems were analyzed theoretically. Based on hyperelastic model, the buckling/post-buckling behaviors of film/substrate structures under large deformation was analyzed using energy method and the analytical expressions of the buckling wavelength, amplitude and critical buckling strain under different conditions were formulated. Then the models of film/substrate structures were established in commercial FEM software and the force analyses of the structures were conducted under appropriate boundary conditions. The mechanical performances of key areas under buckling and post-buckling were determined and compared with theoretical results. Finally, experiments were carried out to measure the buckling/post-buckling deformation of film/substrate structures. The experimental data were compared with theoretical and simulation results and the errors of related parameters were calculated and analyzed. The research result of this dissertation has theoretical and practical meaning for the design and optimization of flexible electronic device structures.