Investigating the dynamic mechanical behaviors of polyurea through experimentation and modeling
Investigating the dynamic mechanical behaviors of polyurea through experimentation and modeling
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DOI：
10.1016/j.dt.2019.04.016
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发表时间：
2019-12-01
影响因子：
5.1
通讯作者：
Huang, Fenglei
中科院分区：
文献类型：
--
作者：
Wang, Hao;Deng, Ximin;Huang, Fenglei
聚脲由于其上级的抗冲击和抗爆炸性能而被广泛应用于许多领域。在这项研究中，聚脲XS-350的力学性能进行了研究，通过系统的实验，在较宽的应变速率范围内（0.001-7000 s（-1）），使用MTS，Instron VHS，和分裂霍普金森杆。获得了聚脲在不同应变速率下的应力-应变行为，分析了应变速率对聚脲主要力学性能的影响。在此基础上，提出了一种基于Mooney-Rivlin模型的率相关本构模型。结果表明，应力-应变曲线可分为三个不同的区域：线弹性阶段，高弹性阶段，和一个近似线性区终止于断裂。聚脲材料的机械性能被发现是高度依赖于应变速率。此外，模型预测和实验的应力-应变曲线之间的比较表明，该模型可以在很宽的应变速率范围内的聚脲的力学性能进行表征。(C)2019作者Elsevier B. V.代表中国舞蹈学会制作并主办。
Polyurea is widely employed as a protective coating in many fields because of its superior ability to improve the anti-blast and anti-impact capability of structures. In this study, the mechanical properties of polyurea XS-350 were investigated via systematic experimentation over a wide range of strain rates (0.001-7000 s(-1)) by using an MTS, Instron VHS, and split-Hopkinson bars. The stress-strain behavior of polyurea was obtained for various strain rates, and the effects of strain rate on the primary mechanical properties were analyzed. Additionally, a modified rate-dependent constitutive model is proposed based on the nine-parameter Mooney-Rivlin model. The results show that the stress-strain curves can be divided into three distinct regions: the linear-elastic stage, the highly elastic stage, and an approximate linear region terminating in fracture. The mechanical properties of the polyurea material were found to be highly dependent on the strain rate. Furthermore, a comparison between model predictions and the experimental stress-strain curves demonstrated that the proposed model can characterize the mechanical properties of polyurea over a wide range of strain rates. (C) 2019 The Authors. Production and hosting by Elsevier B.V. on behalf of China Ordnance Society.