Experimental characterisation and modelling of sugar-filled supramolecular polyurethane

In this work, a reusable supramolecular polyurethane was mixed with sugar particles to produce a model composite material with different particle sizes or volume fractions, which were subsequently characterised and modelled. Large strain mechanical properties of the material were analysed in compression at strain rates up to approximately 1800 s-1. A model was developed that combined the known viscoelastic response of the polyurethane with filler reinforcement and strain activated damage equations calibrated against quasi-static experiments. The model provided a good prediction of the high strain rate behaviour.

本研究中将可重复使用的超分子聚氨酯（supramolecular polyurethane）与糖颗粒混合，制备出具备不同颗粒尺寸或体积分数的模型复合材料，随后对该材料开展表征与建模工作。针对该材料，在应变速率最高可达约1800 s⁻¹的压缩加载条件下，分析其大应变力学性能。本研究构建了一款模型，该模型将聚氨酯已知的粘弹性响应、填料增强效应与基于准静态实验校准的应变激活损伤方程相结合。该模型可对材料的高应变速率力学行为作出良好预测。