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增强铝/聚四氟乙烯ZWT本构模型中弹性模量、应力松弛时间和热软化指数的测定

Determination of Elastic Modulus, Stress Relaxation Time and Thermal Softening Index in ZWT Constitutive Model for Reinforced Al/PTFE.

作者信息

Chen Chuang, Guo Zihan, Tang Enling

机构信息

Key Laboratory of Transient Physical Mechanics and Energy Conversion Materials of Liaoning Province, Shenyang Ligong University, Shenyang 110159, China.

出版信息

Polymers (Basel). 2023 Jan 30;15(3):702. doi: 10.3390/polym15030702.

DOI:10.3390/polym15030702
PMID:36772003
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9919274/
Abstract

Al/PTFE has the advantages of high impact-responsive energy release, appropriate sensitivity, a fast energy release rate, and high energy density, and it is increasingly widely being used in the field of ammunition. In this paper, based on the traditional formula Al/PTFE (26.5%/73.5%), the reinforced Al/PTFE active materials are prepared by the process of cold pressing, sintering, and rapid cooling. Quasi static and dynamic compression experiments were carried out under different compression pressures (200800 MPa), strain rates (0.002 s, 0.02 s, 14003300 s), and temperatures (23 °C, -20 °C, -30 °C, -40 °C). The effects of pressure, strain rate, and temperature on the quasi-static and dynamic compression properties of Al/PTFE materials are analyzed. The results show that the reinforced Al/PTFE specimens show a significant correlation between temperature and strain rate. Based on the classical Zhu-Wang-Tang (ZWT) constitutive model, the ZWT constitutive model parameters of the reinforced Al/PTFE active materials under different pressing pressures at room temperature and the ZWT constitutive model parameters of the reinforced Al/PTFE active materials at low temperature are obtained by fitting, respectively. The accuracy of the constitutive model parameters (elastic modulus, stress relaxation time, and thermal softening index) is verified. In this paper, a constitutive model considering both temperature and strain rate effects is established in order to provide reference for the study of mechanical properties of active materials.

摘要

铝/聚四氟乙烯具有冲击响应能量释放高、灵敏度适中、能量释放速率快和能量密度高的优点，在弹药领域的应用越来越广泛。本文在传统铝/聚四氟乙烯配方（26.5%/73.5%）的基础上，通过冷压、烧结和快速冷却工艺制备了增强型铝/聚四氟乙烯活性材料。在不同压缩压力（200800兆帕）、应变率（0.002秒、0.02秒、14003300秒）和温度（23℃、-20℃、-30℃、-40℃）下进行了准静态和动态压缩实验。分析了压力、应变率和温度对铝/聚四氟乙烯材料准静态和动态压缩性能的影响。结果表明，增强型铝/聚四氟乙烯试样的温度和应变率之间存在显著相关性。基于经典的朱-王-唐（ZWT）本构模型，分别通过拟合得到了室温下不同压制压力下增强型铝/聚四氟乙烯活性材料的ZWT本构模型参数以及低温下增强型铝/聚四氟乙烯活性材料的ZWT本构模型参数。验证了本构模型参数（弹性模量、应力松弛时间和热软化指数）的准确性。本文建立了一个同时考虑温度和应变率效应的本构模型，为活性材料力学性能的研究提供参考。

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本文引用的文献

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2
Mechanical Properties, Constitutive Behaviors and Failure Criteria of Al-PTFE-W Reactive Materials with Broad Density.具有宽密度范围的铝-聚四氟乙烯-钨反应材料的力学性能、本构行为及失效准则
Materials (Basel). 2022 Jul 26;15(15):5167. doi: 10.3390/ma15155167.
3
Research on the Constitutive Model of PTFE/Al/Si Reactive Material.
聚四氟乙烯/铝/硅反应材料本构模型的研究
Polymers (Basel). 2022 Mar 27;14(7):1358. doi: 10.3390/polym14071358.
4
The Effect of Crystallinity on Compressive Properties of Al-PTFE.结晶度对铝-聚四氟乙烯压缩性能的影响。
Polymers (Basel). 2016 Oct 11;8(10):356. doi: 10.3390/polym8100356.
5
Mechanical Response and Shear-Induced Initiation Properties of PTFE/Al/MoO₃ Reactive Composites.
Materials (Basel). 2018 Jul 12;11(7):1200. doi: 10.3390/ma11071200.