U形互连-弹性基底组合结构延展性分析

发布时间：2018-04-09 00:08

本文选题：屈曲　切入点：柔性电子　出处：《现代制造工程》2017年04期

【摘要】：可延展柔性电子器件可共形贴合在复杂曲面的弹性物体表面,在生物集成电子、共形天线等领域具有广泛应用。岛-桥结构设计提高了柔性电子器件的可拉伸能力,桥结构通常设计成U形互连结构,通过有限元计算发现,在拉伸过程中该结构呈现非常复杂的变形行为:桥结构经历纯弯、整体受拉,最后进入塑性变形阶段。桥结构的线宽和结构长跨比对结构延展性影响显著,计算结果表明:宽度减小可以提高结构拉伸能力,但是宽度过小,结构拉伸能力急剧降低;当结构宽度较大时,结构断裂前局部出现平面外屈曲;而跨度增加普遍明显地提高了结构的拉伸能力,但会使结构尺寸变大;长跨比小于1.4时,U形互连结构的延展性随长跨比的增加而增大。通过U形互连结构的变形机理研究可以优化互连结构的结构参数,提高柔性电子器件的延展性。
[Abstract]:Extensible flexible electronic devices can be conformally bonded on the surfaces of elastic objects with complex surfaces. They are widely used in the fields of biointegration electronics conformal antennas and so on.The tensile capacity of flexible electronic devices is improved by the design of island-bridge structure. The bridge structure is usually designed as a U-shaped interconnection structure. The finite element calculation shows that the structure exhibits very complex deformation behavior during the tensile process: the bridge structure goes through pure bending.The whole is pulled and finally enters the plastic deformation stage.The line width and the ratio of length to span of the bridge structure have a significant effect on the ductility of the structure. The calculation results show that reducing the width can improve the tensile capacity of the structure, but if the width is too small, the tensile capacity of the structure decreases sharply, and when the width of the structure is larger,Local out-of-plane buckling occurs before fracture, and the tensile capacity of the structure is obviously increased with the increase of span, and the ductility of U-shaped interconnects increases with the increase of the long span ratio when the span ratio is less than 1.4.By studying the deformation mechanism of U-shaped interconnection structure, the structural parameters of the interconnect structure can be optimized and the ductility of flexible electronic devices can be improved.
【作者单位】：华中科技大学数字制造装备与技术国家重点实验室柔性电子研究中心;
【基金】：国家自然科学基金项目(51322507,51175209) 中央高校基本科研业务费专项资金资助项目(2013YQ048,2013TS019)
【分类号】：TN60

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