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.
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.
作者
贾永臻
Jia Yongzhen(Shenzhen Graduated School,Peking University,Shenzhen 518055,China)
出处
《中南民族大学学报（自然科学版）》
CAS
2018年第4期84-87,共4页
Journal of South-Central University for Nationalities：Natural Science Edition
基金
中央高校基本科研业务费资助项目(2012TS010)
