The interface debonding in particle-reinforced nonlinear viscoelastic polymer composites
The interface debonding in particle-reinforced nonlinear viscoelastic polymer composites
复制标题
颗粒增强非线性粘弹性聚合物复合材料中的界面脱粘
DOI：
10.1007/s11012-022-01484-x
复制
发表时间：
2022-02-16
期刊：
影响因子：
2.7
通讯作者：
Zhang, Bo
中科院分区：
文献类型：
--
作者：
Chen, Jinhan;Yao, Yin;Zhang, Bo
为了方便、可行地描述颗粒增强非线性粘弹性聚合物复合材料（PRNVPC）界面脱粘现象，提出了一种基于归一化方法的细观力学模型，将非线性粘弹性基体的率相关本构关系转化为率无关的线性粘弹性本构关系.通过这种处理，线性均匀化方案被用来实现封闭形式的解决方案的临界颗粒应力和临界时间在界面脱粘开始在PRNVPC。用新模型对颗粒脱粘应力随脱粘角的变化进行了理论预测，预测的变化与实验数据定性一致。此外，还发现颗粒脱粘应力随颗粒尺寸的减小而单调增大。应变速率的增加导致颗粒脱粘应力的增加，但临界脱粘时间的减少。这表明，较小的颗粒和较高的加载速率都有利于改善界面粘合，而后者将缩短引发界面脱粘所需的时间。本研究为PRNVPC界面脱粘的理论表征提供了一种简便的方法，对设计具有良好承载能力的先进聚合物复合材料具有指导意义。
To conveniently and feasibly characterize the interface debonding in particle-reinforced nonlinear viscoelastic polymer composites (PRNVPCs), a micromechanical model is proposed based on a normalization method that can convert the rate-dependent constitutive relationship of a nonlinear viscoelastic matrix into a rate-independent linear viscoelastic constitutive relationship. With this treatment, a linear homogenization scheme is used to achieve closed-form solutions for the critical particle stress and the critical time at the initiation of interface debonding in PRNVPCs. The change in the particle debonding stress versus the debonding angle is theoretically predicted with the new model, and the predicted change is qualitatively consistent with the experimental data. Furthermore, it is found that the particle debonding stress increases monotonically with decreasing particle size. The increase of the applied strain rate leads to an increase of the particle debonding stress but a decrease in the critical debonding time. This demonstrates that a smaller particle and a higher loading rate are both beneficial for improving the interfacial adhesion, while the latter will shorten the time needed to initiate interface debonding. The present research provides a convenient approach to theoretically characterize the interface debonding in PRNVPCs, which should be of guiding value for the design of advanced polymeric composites with a good load bearing capacity.