不同应变率下聚乙烯材料的压缩力学性能

徐立志; 高光发; 赵真; 王江波; 程春; 杜忠华

doi:10.11883/bzycj-2017-0266

不同应变率下聚乙烯材料的压缩力学性能

doi: 10.11883/bzycj-2017-0266

1.
南京理工大学能源与动力工程学院, 江苏南京 210094
2.
上海宇航系统工程研究所, 上海 201109

基金项目:

国家自然科学基金 11472008

国家自然科学基金 11772160

国家自然科学基金 11202206

"十三五"装备预研领域基金 KFJJ13-9M

中央高校基本科研业务费专项 30915118801

江苏省自然科学基金 BK20170819

"力学"浙江省重中之重学科开放基金 xklx1513

详细信息

作者简介:
徐立志(1990-), 男, 博士研究生

通讯作者:
杜忠华, duzhonghua@aliyun.com

中图分类号: O347;TJ413
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出版历程
- 收稿日期: 2017-07-20
- 修回日期: 2017-09-15
- 刊出日期: 2019-01-25

Compressive mechanical properties of polyethylene at different strain rates

1.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2.
Aerospace System Engineering Shanghai, Shanghai 201109, China

摘要

摘要: 为了研究聚乙烯材料在不同应变率下的压缩力学性能，通过准静态实验和动态实验获得聚乙烯材料不同应变率下的应力应变曲线，分析发现：聚乙烯的弹性模量和屈服强度随应变率增大而增大，具有明显的黏弹塑性；聚乙烯材料进入塑性阶段，其应力应变曲线在不同应变率下具有相近的变化趋势，即塑性切向模量近似相同。根据聚乙烯材料的压缩力学性能，建立了弹性区、屈服点和塑性区的分段本构模型。该模型的屈服点和塑性段与实验结果吻合较好，由于弹性段采用线弹性模型，与实验结果存在一定偏差，可近似描述材料的弹性行为。
- 聚乙烯 /
- 压缩性能 /
- 应变率 /
- 本构模型
Abstract: In this work, we studied the compressive mechanical properties of polyethylene at different strain rates and obtained the stress-strain curves of polyethylene at different strain rates using static and dynamic experiments. We analyzed the stress-strain curves of polyethylene and discovered that the elastic modulus and the yield strength of polyethylene increase with the increase of the strain rate, and polyethylene has obvious viscoelasticity. The stress-strain curves have similar trends at different strain rates after polyethylene enters the plastic stage. We established a constitutive model of elastic zone, yield point and plastic zone according to compressive mechanical properties of polyethylene. The yield point and the plastic section of the model are in good agreement with the experimental results. As the elastic section adopts the linear elastic model, a certain deviation from the experimental results was observed, which can approximately describe the elastic behavior of the material.
- polyethylene /
- compressive property /
- strain rate /
- constitutive model

HTML全文

图 1 准静态实验装置图

Figure 1. Quasi-static experimental device

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图 2 工程和真实应力应变曲线的对比

Figure 2. Comparison between engineering and true stress-strain curve

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图 3 SHPB装置示意图

Figure 3. Schematic of SHPB system

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图 4 动态实验波形

Figure 4. Dynamic response waves

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图 5 不同应变率下材料应力应变曲线

Figure 5. Stress-strain curves at different strain rates

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图 6 塑性模量拟合曲线

Figure 6. Fitted curves of plastic modulus

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图 7 弹性模量对数应变率关系曲线

Figure 7. Relation between elastic modulus and logarithmic strain rate

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图 8 屈服应力模量对数应变率关系曲线

Figure 8. Relation between yield stress and logarithmic strain rate

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图 9 塑性应力应变关系曲线

Figure 9. Relation between plastic stress and strain

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图 10 不同应变率下塑性应力应变曲线

Figure 10. Relation between plastic stress and strain at different strain rates

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表 1 参数拟合结果

Table 1. Fitted parameters

${\dot \varepsilon } $/s^-1	A	B	C/MPa	D	σ_i/MPa	$ {\dot \varepsilon }$₀/s^-1	m	n
< 1 000	0.086 2	0.718 2	9 684.904	1.916 1	19.457 4	2.178 7×10⁸	1.07	0.482 87
≥1 000	5.065 8	-14.363 8

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参考文献(21)

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