石墨烯与柔性基底界面载荷传递的拉曼光谱实验

发布时间：2018-07-22 11:57

【摘要】：本文研究了CVD制备的大尺寸石墨烯与柔性PET基底在拉伸变形过程中切向界面载荷传递的问题,采用原位拉曼光谱实验给出了加载过程中石墨烯的正应变、正应力以及界面切应力的分布曲线。分析表明,石墨烯与PET基底间的载荷传递存在四个阶段,分别是初始阶段、粘附阶段、滑移阶段和界面脱粘破坏阶段。在此基础上,本文对50μm、140μm、270μm和600μm四种尺寸石墨烯试件的界面力学性能进行测量,得到了不同尺寸石墨烯试件的界面力学性能参数,并初步给出了基底变形引起的石墨烯切向界面粘接能的变化,同时分析了试件尺寸对石墨烯界面力学性能的影响。实验结果表明,石墨烯材料和柔性基底最大切应力与临界脱粘切向界面粘接能等界面强度指标受到尺寸的显著影响,尺寸越小切向界面强度越高,反之,尺寸越大则越低。
[Abstract]:In this paper, the problem of shear interface load transfer between large size graphene and flexible PET substrate prepared by CVD during tensile deformation is studied. The positive strain of graphene during loading is obtained by in situ Raman spectroscopy. The distribution curve of normal stress and interfacial shear stress. The analysis shows that there are four stages of load transfer between graphene and PET substrate, namely initial stage, adhesion stage, slip stage and interface debonding failure stage. On this basis, the interfacial mechanical properties of four graphene specimens of 50 渭 m, 140 渭 m, 270 渭 m and 600 渭 m were measured, and the interfacial mechanical properties of graphene specimens with different sizes were obtained. The influence of specimen size on the mechanical properties of graphene interface was analyzed. The experimental results show that the maximum shear stress and critical debonding shear interface bonding energy of graphene materials and flexible substrates are significantly affected by the dimension. The smaller the dimension, the higher the tangential interface strength, whereas the smaller the dimension, the lower the interface strength.
【作者单位】：天津大学机械工程学院力学系现代工程力学天津市重点实验室;
【基金】：国家自然科学基金(11372217;11672203)资助
【分类号】：O348

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