Experimental characterisation and modelling of the strain rate dependent mechanical response of a filled thermo-reversible supramolecular polyurethane
Experimental characterisation and modelling of the strain rate dependent mechanical response of a filled thermo-reversible supramolecular polyurethane
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DOI：
10.1016/j.ijimpeng.2022.104239
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发表时间：
2022-04
影响因子：
5.1
通讯作者：
H. Chen;L. Hart;W. Hayes;C. Siviour
中科院分区：
文献类型：
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作者：
H. Chen;L. Hart;W. Hayes;C. Siviour
由填充有各种颗粒的聚合物粘合剂组成的复合材料广泛用于工业应用，其工程设计的关键是能够生成这些材料的机械模型。许多复合材料的一个限制是使用交联弹性体作为基体材料，这降低了可重复使用性和可回收性。在这项研究中，最近开发的可重复使用、可低温加工的超分子聚氨酯与糖颗粒混合，生产出具有不同粒径或体积分数的模型复合材料，随后对其进行表征和建模。在高达约 1800 s−1 的应变率下压缩时分析了材料的大应变机械性能，并得到了不同温度和频率下小应变粘弹性响应测量的支持。开发了一个模型，将超分子聚氨酯的已知粘弹性响应与填料增强和根据准静态实验校准的应变激活损伤方程相结合。该模型提供了对高应变率行为的良好预测，为此还考虑了样品绝热加热的影响。模型参数与填料粒径和体积分数相关。最后，对几何形状和强度恢复进行了初步研究。
Composites consisting of a polymer binder filled with various particles are widely used in industrial applications, and key to their engineering design is the ability to produce mechanical models of these materials. One limitation of many composites is the use of cross-linked elastomers as matrix materials, which reduces re-usability and recyclability. In this research, a recently developed reusable and low temperature processable 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, supported by measurements of the small strain viscoelastic response at different temperatures and frequencies. A model was developed that combined the known viscoelastic response of the supramolecular 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, for which the effect of adiabatic heating in the sample was also considered. The model parameters were related back to the filler particle size and volume fraction. Finally, a preliminary study of geometry and strength recovery was performed.