柔性电子系统中岛-桥结构的力学行为分析与数值模拟
发布时间：2019-01-03 19:17
【摘要】：柔性电子器件采用柔性基底以及新型的材料和结构,这使电子器件具有很好的延展性和柔性,在医疗器械、能量收集、传感、国防等领域具有广泛应用前景。柔性电子器件具有与传统电子器件无法比拟的优点,它可以承受很大的力学变形而保持电学性能不发生变化。对柔性电子器件的力学分析可以为柔性电子器件的设计以及力学失效提供理论基础,对柔性电子器件的发展具有重大的意义。本文对柔性电子器件中常用的岛-桥结构的力学行为进行理论分析和有限元模拟。首先,通过对实际柔性电子器件中的岛-桥结构进行简化,建立其力学模型进行理论求解,分别基于梁理论和板理论对岛-桥结构在基底预应变释放后的力学行为进行了分析,得出了变形后桥中点处的最大位移,并分析比较了两种理论的优劣势。其次,对岛-桥结构的二维简化模型进行了有限元模拟,分别探讨了位移载荷、岛-桥结构弹性模量、基底与岛-桥结构厚度比以及基底中预拉伸应变大小对岛-桥结构变形的影响,通过拟合得出了相关的最佳参数,并与理论分析的结果进行了比较,验证了理论分析的结果。最后,对岛-桥结构的变形进行了三维有限元模拟,探讨了岛-桥结构在受载过程中的变形机理,利用重启动分析技术研究了基底中预拉伸载荷对岛-桥结构变形的影响,并将三维的模拟结果与二维结果进行了对比,分析了二者结果之间产生差异的原因。本文的分析结果对柔性电子器件结构的设计和优化具有一定的理论和实际意义。
[Abstract]:Flexible electronic devices adopt flexible substrates and new materials and structures, which make the electronic devices have good ductility and flexibility, and have a broad application prospect in medical devices, energy collection, sensing, defense and other fields. Flexible electronic devices have the advantages that cannot be compared with traditional electronic devices. They can withstand large mechanical deformation and keep their electrical properties unchanged. The mechanical analysis of flexible electronic devices can provide a theoretical basis for the design and mechanical failure of flexible electronic devices. It is of great significance to the development of flexible electronic devices. In this paper, the mechanical behavior of island-bridge structures commonly used in flexible electronic devices is analyzed theoretically and simulated by finite element method. Firstly, by simplifying the island-bridge structure in practical flexible electronic devices and establishing its mechanical model, the mechanical behavior of the island-bridge structure after the foundation pre-strain release is analyzed based on the beam theory and the plate theory, respectively. The maximum displacement at the midpoint of the deformed bridge is obtained, and the advantages and disadvantages of the two theories are analyzed and compared. Secondly, the two-dimensional simplified model of island-bridge structure is simulated by finite element method, and the displacement load, elastic modulus of island-bridge structure are discussed respectively. The effect of the thickness ratio of the basement to the island-bridge structure and the pre-tensile strain in the basement on the deformation of the island-bridge structure is studied. The best parameters are obtained by fitting, and the results are compared with those of the theoretical analysis, and the results of the theoretical analysis are verified. Finally, the deformation of island-bridge structure is simulated by three-dimensional finite element method, and the deformation mechanism of island-bridge structure under load is discussed. The effect of pretension load on the deformation of island-bridge structure is studied by restarting analysis technique. The results of three-dimensional simulation and two-dimensional results are compared, and the reasons for the difference between the two results are analyzed. The results of this paper are of theoretical and practical significance for the design and optimization of flexible electronic devices.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN603
本文编号：2399774
[Abstract]:Flexible electronic devices adopt flexible substrates and new materials and structures, which make the electronic devices have good ductility and flexibility, and have a broad application prospect in medical devices, energy collection, sensing, defense and other fields. Flexible electronic devices have the advantages that cannot be compared with traditional electronic devices. They can withstand large mechanical deformation and keep their electrical properties unchanged. The mechanical analysis of flexible electronic devices can provide a theoretical basis for the design and mechanical failure of flexible electronic devices. It is of great significance to the development of flexible electronic devices. In this paper, the mechanical behavior of island-bridge structures commonly used in flexible electronic devices is analyzed theoretically and simulated by finite element method. Firstly, by simplifying the island-bridge structure in practical flexible electronic devices and establishing its mechanical model, the mechanical behavior of the island-bridge structure after the foundation pre-strain release is analyzed based on the beam theory and the plate theory, respectively. The maximum displacement at the midpoint of the deformed bridge is obtained, and the advantages and disadvantages of the two theories are analyzed and compared. Secondly, the two-dimensional simplified model of island-bridge structure is simulated by finite element method, and the displacement load, elastic modulus of island-bridge structure are discussed respectively. The effect of the thickness ratio of the basement to the island-bridge structure and the pre-tensile strain in the basement on the deformation of the island-bridge structure is studied. The best parameters are obtained by fitting, and the results are compared with those of the theoretical analysis, and the results of the theoretical analysis are verified. Finally, the deformation of island-bridge structure is simulated by three-dimensional finite element method, and the deformation mechanism of island-bridge structure under load is discussed. The effect of pretension load on the deformation of island-bridge structure is studied by restarting analysis technique. The results of three-dimensional simulation and two-dimensional results are compared, and the reasons for the difference between the two results are analyzed. The results of this paper are of theoretical and practical significance for the design and optimization of flexible electronic devices.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN603
【引证文献】
相关会议论文 前3条
1 曲斌瑞;冯雪;;柔性电子的制备表征及力学性能研究[A];中国力学学会学术大会'2009论文摘要集[C];2009年
2 王永;冯雪;黄永刚;;可延展柔性铁电器件力学分析[A];中国力学学会学术大会'2009论文摘要集[C];2009年
3 ;2010年第四届微纳米海峡两岸科技暨纳微米系统与加工制备中的力学问题研讨会[A];2010年第四届微纳米海峡两岸科技暨纳微米系统与加工制备中的力学问题研讨会摘要集[C];2010年
，本文编号：2399774
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