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Michinical Analysis And Simulation Of Bridge-island Structure In Flexible Electronics

Posted on:2016-08-10Degree:MasterType:Thesis
Country:ChinaCandidate:P WuFull Text:PDF
GTID:2308330479991329Subject:Aerospace engineering
Abstract/Summary:PDF Full Text Request
Flexible electronics devices use flexible substrate, new materials and new structure, which give electronics a good stretchability and flexibility. Flexible electronics have great potential in areas such as medical equipment, energy harvesting, sensing etc. Flexible electronics have an incomparable advantage to traditional electronics. They can keep their electrical performance while enduring a big mechanical deformation. Mechanical analysis to flexible electronics can give a theoretical foundation to the design and failure analysis of flexible electronics and have a great importance to the development of flexible electronics.In this thesis, the mechanical behavior of bridge-island structure commonly used in flexible electronics is studied by theoretical method and finite element simulation. Firstly, the mechanical model of bridge-island structure is set up according the actual structure of flexible electronics. Mechanical analysis of bridge-island model after releasing the prestrain in the substrate is performed using the beam theory and plate theory. The maximum displacement in the bridge is obtained, and a comparison of the two theories is performed. Then, a 2D simulation of the bridge-island structure is executed, and the effect of parameters such as displacement load, the Young’s modulus of the structure, the ratio of thickness of the substrate and the structure and the prestrain in the substrate is discussed. The optimal parameters are obtained by fitting the simulation data. Comparison of the 2D simulation and the theoretical analysis is performed. Finally, the deformation mechanism of the bridge-island structure is studied using a 3D finite element simulation. The effect of prestrain in the substrate is considered using the restart analysis technique. The differences between the 2D and 3D simulation are discussed, and the reason of the differences is analyzed. The results of this thesis have an theoretical and practical guidance to the design and optimization of the structures in flexible electronics.
Keywords/Search Tags:flexible electronics devices, bridge-island structure, energy method, ABAQUS finite element simulation, restart analysis technique
PDF Full Text Request
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