PCL微/纳米纤维弹性性能在弯曲实验中的尺度效应研究

介绍了一种聚乙内酯(PCL)微/纳米纤维在弯曲实验中弹性性能的尺度效应模型。该模型是基于非局部理论的一种考虑非局部效应的微尺度模型,通过该模型可以计算出纤维材料的弹性性能在弯曲变形中的两种尺度效应:一种跟纤维的直径相关(D-SD),另外一种跟纤维的长度相关(L-SD)。采用原子力显微镜对PCL微/纳米纤维进行测试,对比PCL微/纳米纤维的三点弯曲实验数据与理论模型的计算结果,说明该模型可以解释纤维弹性性能的尺度效应,并且也适用于其他高分子纤维材料的微尺度弹性力学性能分析。

Research on the size effect of PCL micro/nano fiber elastic properties under bending test

A model based on non-local theory was built to anticipate the size effect of the elastic properties of PCL micro/nano fibers under three-point bending tests. The model forecast demonstrates that there are two sorts of size reliance for the bending tests,one is related with the fiber diameter,which is named as diameter size reliance(D-SD),the other is related with the fiber length,which is named as length size reliance(L-SD). The PCL micro/na-no fibers were tested by atomic force microscope,and the calculation results of the three point bending experiment data and theoretical model of PCL micro/nano fibers were compared. It is demonstrated that the model can explain the scale effect of fiber elastic properties,and it also can be applied to the analysis of micro-elastic mechanical properties of other polymer fiber materials.