基于挤压弯曲的柔性银导线力学可靠性试验研究  

Experimental Study on Mechanical Reliability of Flexible Silver Wire Based on Extrusion Bending

作　　者：李超[1] 孙权[2] 秦宗慧[1] 汤成莉[2] 鹿业波[2] 陈建钧[1] LI Chao;SUN Quan;QIN Zonghui;TANG Chengli;LU Yebo;CHEN Jianjun(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China;School of Mechanical and Electrical Engineering,Jiaxing University,Jiaxing 314001,Zhejiang,China)

机构地区：[1]华东理工大学机械与动力工程学院,上海200237 [2]嘉兴学院机电工程学院,浙江嘉兴314001

出　　处：《华东理工大学学报（自然科学版）》2021年第3期354-360,共7页Journal of East China University of Science and Technology

基　　金：浙江省自然科学基金(LQ19E050008)。

摘　　要：柔性电子产品在使用过程中不可避免地会受到拉伸、弯曲等多种形式的复杂变形,在长时间工作中疲劳成为产品失效的重要模式之一。针对柔性电子导线可靠性问题,通过原位疲劳测试平台对导线弯曲疲劳损伤行为进行研究。在弯曲测试过程中,通过理论分析定量确定薄膜最小曲率半径与挤压位移的关系,并利用有限元仿真及实验验证了推论的正确性,然后对试样分别进行单次和疲劳弯曲试验研究。结果表明,墨水浓度越低,制备出的银薄膜孔隙率越高,初始电阻越大,同时孔隙作为缺陷使薄膜抗弯曲性能变差,但是增大的孔隙率能够有效地抑制薄膜疲劳损伤演化,使其弯曲疲劳稳定性提高。Under stretching,bending and many other mechanical loading forms,flexible electronics products would inevitably be subjected to complex deformation during working,and fatigue has become one of the most important failure modes during long-time working.In order to solve the reliability problem of flexible electronics,an in-situ fatigue testing platform is developed to study bending fatigue damage behavior of flexible electronic.In the process of bending,the relationship between the minimum radius of curvature and extrusion displacement is determined quantitatively by theoretical analysis,the correctness of the conclusion is verified by finite element simulation and experimental data,and the single and fatigue bending experiments are carried out on the samples of flexible electronics.The experimental results show that the lower concentration of silver nanoparticle ink results in silver film with higher porosity and initial electrical resistance.At the same time,the porosity as a defect makes the bending resistance worse.However,the free surface increases as the pore increases,making the vacancies formed during the deformation more easily annihilated.As a result,the fatigue damage evolution of silver thin films is effectively inhibited,which makes the bending fatigue stability higher.

关 键 词：柔性电子 曲率半径 试验机 弯曲疲劳 孔隙率 

分 类 号：TH114[机械工程—机械设计及理论]