UHMWPE的应变率效应及其对超高速碰撞特性的影响

石景富; 于东; 徐铧东; 刘蕾; 苗常青

doi:10.11858/gywlxb.20220666

UHMWPE的应变率效应及其对超高速碰撞特性的影响

doi: 10.11858/gywlxb.20220666

石景富^1,,
于东²,
徐铧东¹,
刘蕾¹,
苗常青^1,*, ,

1.
哈尔滨工业大学特种环境复合材料技术国家级重点实验室, 黑龙江哈尔滨　150001
2.
哈尔滨工业大学机电学院机械设计系, 黑龙江哈尔滨　150001

详细信息

作者简介:
石景富（1994－），男，博士研究生，主要从事聚合物材料力学性能研究. E-mail：shijf@stu.hit.edu.cn

通讯作者:
苗常青（1972－），男，博士，教授，主要从事柔性复合材料研究. E-mail：miaocq@hit.edu.cn

中图分类号: O347.3; O414.19
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- PDF下载量: 39
出版历程
- 收稿日期: 2022-09-28
- 修回日期: 2022-11-04
- 网络出版日期: 2023-04-17
- 刊出日期: 2023-06-05

Strain Rate Effect of UHMWPE and Its Influence on Hypervelocity Impact Performance

SHI Jingfu^1
,,
YU Dong²,
XU Huadong¹,
LIU Lei¹,
MIAO Changqing^{1,*
, ,}

1.
National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China
2.
Department of Mechanical Design, School of Mechanical and Electrical Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China

摘要

摘要: 为分析超高分子量聚乙烯（ultra-high molecular weight polyethylene, UHMWPE）的应变率效应及其对超高速碰撞特性的影响规律，采用万能材料试验机和分离式霍普金森拉杆对UHMWPE纤维束进行静、动态拉伸实验，获得了不同应变率下材料的应力-应变关系，并进一步开展了UHMWPE纤维织物的超高速碰撞数值模拟。结果表明，UHMWPE的拉伸模量和强度均随应变率的升高而逐渐增大。随着材料应变率敏感系数的增大，防护结构对弹丸动能的吸收率呈现先减小后增大的趋势。
- 超高分子量聚乙烯 /
- 应变率 /
- 动态拉伸 /
- 超高速碰撞
Abstract: To analyze the strain rate effect and its influence on the dynamic response of ultra-high molecular weight polyethylene (UHMWPE) subjected to hypervelocity impact, the stress-strain relation of UHMWPE at different strain rates loading were obtained through universal material testing machine and Hopkinson bar experimental system. Furthermore, strain rate effect on the hypervelocity impact response was analyzed by numerical simulation. The results show that the tensile modulus and strength increase with the rise of strain rate. With the increase of the strain rate sensitivity index, the energy absorption ratio of the protective structure against the projectile decreases at the beginning followed by an increasing trend.
- ultra-high molecular weight polyethylene (UHMWPE) /
- strain rate /
- dynamic tensile /
- hypervelocity impact

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图 1 准静态拉伸测试：(a) 拉伸测试前， (b) 拉伸测试后

Figure 1. Quasi-static tensile test: (a) before the tensile test, (b) after the tensile test

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图 2 夹具示意图

Figure 2. Schematic diagram of the fixture

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图 3 UHMWPE纤维束动态拉伸试件

Figure 3. Specimens of UHMWPE fiber bundles for dynamic tensile

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图 4 动态拉伸波形

Figure 4. Waveform obtained by dynamic tensile

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图 5 准静态拉伸应力-应变曲线

Figure 5. Stress-strain curves obtained by quasi-static tensile

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图 6 动态拉伸应力-应变曲线

Figure 6. Stress-strain curves obtained by dynamic tensile

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图 7 模量和强度随应变率的变化曲线

Figure 7. Modulus and strength versus strain rate

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图 8 纤维织物纱线编织单胞模型

Figure 8. Unit cell model of fiber fabric yarn weaving

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图 9 单层纤维织物几何模型

Figure 9. Geometric model of single-layer fiber fabric

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图 10 纤维织物超高速碰撞数值模型

Figure 10. Numerical model of fiber fabric subjected to hypervelocity impact

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图 11 模拟结果与实验结果的对比：(a) 弹丸速度，(b) 动能吸收

Figure 11. Comparison between the numerical results and experiment: (a) projectile velocity, (b) energy absorption

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图 12 不同时刻的碎片云图

Figure 12. Debris cloud map at different moments

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图 13 纤维织物应力云图

Figure 13. Stress nephogram of fiber fabric

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图 14 弹丸动能吸收率随应变率敏感系数变化曲线

Figure 14. Energy absorption ratio versus strain-rate sensitivity coefficient

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