聚脲弹性体动态力学行为：实验表征、微观机制及本构建模

初东阳; 姚凯丽; 庄茁; 柳占立

doi:10.21656/1000-0887.450176

聚脲弹性体动态力学行为：实验表征、微观机制及本构建模

doi: 10.21656/1000-0887.450176

初东阳^1,2,
姚凯丽¹,
庄茁¹,
柳占立^1, ,

1. 清华大学航天航空学院工程力学系，北京 100084;
2. 中国船舶科学研究中心，江苏无锡 214082

基金项目:

国家自然科学基金（11972210）；国家重点研发计划项目（2022YFC3320502）

详细信息

作者简介:
初东阳（1993—），男，高级工程师，博士(E-mail: cdyw@foxmail.com);柳占立（1981—），男，教授，博士，博士生导师(通讯作者. E-mail: liuzhanli@tsinghua.edu.cn).

通讯作者:
柳占立（1981—），男，教授，博士，博士生导师(通讯作者. E-mail: liuzhanli@tsinghua.edu.cn).

中图分类号: O232
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- 文章访问数: 21
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出版历程
- 收稿日期: 2024-06-17
- 修回日期: 2025-07-25
- 网络出版日期: 2025-10-17

Dynamic Behaviors of Polyurea Elastomer: Experimental Characterization, Microscopic Mechanisms and Constitutive Modeling

1. Department of Engineering Mechanics, School of Aerospace Engineering, Tsinghua University,Beijing 100084, P.R.China;
2. China Ship Scientific Research Center, Wuxi, Jiangsu 214082, P.R.China

Funds:

The National Science Foundation of China(11972210)

摘要

摘要: 聚脲弹性体在冲击防护领域有广阔的应用前景，然而，目前对于聚脲在高压冲击、层裂等情况下的变形失效物理机制仍不明晰，尚缺乏有效描述聚脲在多种应变率及应力状态下动态变形和失效的本构及损伤模型.针对这些挑战性问题，该文结合实验表征、分子动力学仿真以及宏观力学建模，对聚脲弹性体在不同应变率、冲击压力及应力状态下的变形失效行为进行了系统研究.通过建立聚脲全原子和两种粗粒化模型及微结构演化分析，揭示了聚脲在高应变率拉伸、高压冲击等载荷下的变形微观物理机制，以及高应力三轴度下的动态失效物理机制.建立了考虑强冲击下应变率温度压力耦合效应的聚脲弹性体本构模型，以及包括孔洞形核准则、流动法则的多种变形模式统一描述的宏观损伤模型.经验证，所建立的宏观力学模型能够正确描述聚脲在冲击载荷下的动态变形失效行为.该工作可为后续聚脲弹性体的优化设计及冲击防护应用提供指导.
- 聚脲弹性体 /
- 动态力学行为 /
- 孔洞损伤 /
- 本构模型 /
- 分子动力学
Abstract: The application of polyurea elastomer to impact protection has broad prospects. However, the physical mechanisms of dynamic deformation and failure of the polyurea under high-pressure impact, delamination, and other conditions are still unclear. Besides, effective constitutive and damage models to describe the dynamic behaviors of polyurea under various strain rates and stress states are still scarce. In response to these challenging issues, the dynamic behaviors of polyurea elastomers under different strain rates, impact pressures, and stress states were systematically studied through experimental characterization, molecular dynamics simulation, and macroscopic mechanical modeling. Full atomic and 2 coarse-grained models for polyurea were established, its microstructure evolution was analyzed, and the microscopic physical mechanisms of deformation and failure of polyurea under high-strain-rate tension, high-pressure impact and high stress triaxiality loading, were revealed. A constitutive model for polyurea elastomers was established in view of the coupling effects of strain rates, temperature and pressure under strong impact. A macroscopic damage model uniformly describing multiple deformation modes was built, including void nucleation criteria and void flow rules. Through verification, the established macroscopic mechanical models can accurately describe the dynamic behaviors of polyurea under impact loading. This work provides a guidance for the optimization design and impact protection application of polyurea elastomers in the future.
- polyurea elastomer /
- dynamic behavior /
- void damage /
- constitutive model /
- molecular dynamics

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聚脲弹性体动态力学行为：实验表征、微观机制及本构建模

doi: 10.21656/1000-0887.450176

作者简介:
初东阳（1993—），男，高级工程师，博士(E-mail: cdyw@foxmail.com);柳占立（1981—），男，教授，博士，博士生导师(通讯作者. E-mail: liuzhanli@tsinghua.edu.cn).

通讯作者:
柳占立（1981—），男，教授，博士，博士生导师(通讯作者. E-mail: liuzhanli@tsinghua.edu.cn).

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Dynamic Behaviors of Polyurea Elastomer: Experimental Characterization, Microscopic Mechanisms and Constitutive Modeling

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目录

留言板

聚脲弹性体动态力学行为：实验表征、微观机制及本构建模

doi: 10.21656/1000-0887.450176

作者简介: 初东阳（1993—），男，高级工程师，博士(E-mail: cdyw@foxmail.com);柳占立（1981—），男，教授，博士，博士生导师(通讯作者. E-mail: liuzhanli@tsinghua.edu.cn).

通讯作者: 柳占立（1981—），男，教授，博士，博士生导师(通讯作者. E-mail: liuzhanli@tsinghua.edu.cn).

计量

出版历程

Dynamic Behaviors of Polyurea Elastomer: Experimental Characterization, Microscopic Mechanisms and Constitutive Modeling

计量

出版历程

目录

作者简介:
初东阳（1993—），男，高级工程师，博士(E-mail: cdyw@foxmail.com);柳占立（1981—），男，教授，博士，博士生导师(通讯作者. E-mail: liuzhanli@tsinghua.edu.cn).

通讯作者:
柳占立（1981—），男，教授，博士，博士生导师(通讯作者. E-mail: liuzhanli@tsinghua.edu.cn).