贾永臻.光学透明胶的超弹性力学性能表征方法研究[J].中南民族大学学报自然科学版,2018,(4):84-87
光学透明胶的超弹性力学性能表征方法研究
The Characterization Method of the Hyperelastic Behavior for the Optically Clear Adhesive
  
DOI:10.12130/znmdzk.20180417
中文关键词: 光学透明胶  柔性 OLED  超弹性本构  减缩多项式模型  Arruda-Boyce 模型
英文关键词: optically clear adhesive  flexible OLED  Hyperelasticity modeling  reduced polynomial model  ArrudaBoyce model
基金项目:中央高校基本科研业务费资助项目( 2012TS010)
作者单位
贾永臻 北京大学 深圳研究生院深圳 518055 
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中文摘要:
      光学透明胶( OCA) 的复杂力学行为可以导致柔性显示屏幕表面形成波浪状条纹, 最终影响显示效果. 而 构建 OCA 胶材的力学本构模型是研究柔性 OLED 屏幕应力管控问题的关键. 本文采用 DMA 和旋转流变仪, 分别 测试了 OCA 胶材在拉伸和简单剪切变形模式下的应力应变关系,并选用减缩多项式模型和 Arruda-Boyce 模型建立 OCA 胶材的超弹性本构模型. 基于实验获取的应力应变数据,采用 Levenberg-Marquardt 算法,完成了模型参数的拟 合和 Drucker 稳定性评估. 结果表明: 三阶以上的减缩多项式模型可以构建出适用于 OCA 胶材的高精度超弹性本 构模型.
英文摘要:
      The optically clear adhesive ( OCA) has a complicated mechanical behavior, which can lead to the wavy stripe in the surface of the flexible OLED screen. This issue has a negative effect on the flexible display. Hence, the construction of the mechanical model is essential to conduct the stress management of the flexible display. In the present work, the stress-strain curves under the tensile and simple shear deformation are tested by the dynamic thermomechanical analysis and the rheometer, respectively. Besides, the Arruda-Boyce model and the reduced polynomial model are used to study the hyperelastic behavior of the adhesive. Based on the stress-strain data, the Levenberg-Marquardt method is conducted to fit the model parameters. Then the Drucker stability is evaluated to select the reasonable model. The result shows that the reduced polynomial model (N≥3) can be used to characterize the hyperelastic behavior of the adhesive with good precision.
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