MDYB-3有机玻璃在不同应变率下的一维屈服行为

邓小秋; 李志强; 周志伟; 王志华; 姚小虎

doi:10.11883/1001-1455-(2015)03-0312-08

MDYB-3有机玻璃在不同应变率下的一维屈服行为

doi: 10.11883/1001-1455-(2015)03-0312-08

邓小秋^{1, 2},
李志强^{1, 2, ,},
周志伟³,
王志华^{1, 2},
姚小虎⁴

1.
太原理工大学应用力学与生物医学工程研究所, 山西太原 030024
2.
太原理工大学材料强度与结构冲击山西省重点实验室, 山西太原030024
3.
中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室, 甘肃兰州730000
4.
华南理工大学土木与交通学院, 广东广州510641

基金项目: 国家自然科学基金项目(11072166);国家国际科技合作专项项目(2011DFA53080);山西省高等学校优秀青年学术带头人基金项目(2011)

详细信息

作者简介:
邓小秋(1988—), 男, 硕士研究生

通讯作者:
李志强, lizhiqiang@tyut.edu.cn

中图分类号: O347.3
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- 被引次数: 0
出版历程
- 收稿日期: 2013-11-11
- 修回日期: 2014-03-04
- 刊出日期: 2015-05-25

One-dimensional yield behavior of MDYB-3 polymethyl methacrylate at different strain rates

Deng Xiao-qiu^{1, 2},
Li Zhi-qiang^{1, 2
, ,},
Zhou Zhi-wei³,
Wang Zhi-hua^{1, 2},
Yao Xiao-hu⁴

1.
Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
2.
Shanxi Key Laboratory of Material Strength and Structure Impact, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
3.
State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China
4.
School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, Guangdong, China

摘要

摘要: 对MDYB-3有机玻璃进行了多组不同应变率(10^-3~3 000 s^-1)下的压缩实验, 得到准静态下的屈服应力与动态下的峰值应力。沿其增强与面内2个方向进行准静态压缩实验, 以分析定向拉伸对屈服应力的影响, 修正了Ree-Eyring模型与Cooperative模型以描述定向有机玻璃的屈服行为。采用Johnson-Cook模型描述屈服后的黏塑性行为。结果表明Cooperative屈服模型比Ree-Eyring屈服模型更接近实验结果, 且能准确描述准静态屈服应力。动态压缩下的峰值应力为失效应力, 说明试样在1 500 s^-1以上应变率下未达到屈服应力时已经发生破坏。Johnson-Cook模型对于单条曲线拟合良好, 但无法准确描述材料的应变率相关性。
- 固体力学 /
- 准静态/动态压缩 /
- Johnson-Cook模型 /
- 屈服应力 /
- MDYB-3有机玻璃
Abstract: Several groups of compression tests at different strain rates(10^-3~3 000 s^-1)are carried out for MDYB-3 polymethyl methacrylate.Yield stress in the quasi-static tests and peak stress in the dynamic tests are obtained.Compression tests are performed along normal direction and parallel directions of samples to analyze the effect of orientation stretching on yield stress.Ree-Eyring model and Cooperative model are revised to describe the yield behavior of directional PMMA.Viscoplastic behaviors after yield are attempted to be described using Johnson-Cook model.The results of Cooperative yield model are shown to be closer to the test results than those of Ree-Eyring yield model.Cooperative yield model can describe the yield stress of quasi-static tests accurately.Peak stress in dynamic compression test is failure stress, which means that samples fail before yield at the strain rate above 1 500 s^-1.The fitting results reveal that Johnson-Cook model can describe a single stress-strain curve well, but it cannot predict the dependence of strain rate.
- solid mechanics /
- quasi-static/dynamic compression /
- Johnson-Cook model /
- yield stress /
- MDYB-3 polymethyl methacrylate

HTML全文

图 1 实验前后MDYB-3有机玻璃的压缩变形形态

Figure 1. Deformation of MDYB-3 PMMA before and after compression tests

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图 2 实验所得有机玻璃应力应变曲线

Figure 2. The stress of PMMA varied with strain in tests

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图 3 修正屈服模型的准静态屈服应力与应变率对数曲线

Figure 3. The quasi-static stress of the two revised yield models varied with the logarithmic strain rate

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图 4 修正屈服模型的动态应力与应变率对数曲线

Figure 4. The dynamic stress of the two revised yield models varied with the logarithmic strain rate

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图 5 塑性起点为弹性极限的修正Johnson-Cook公式曲线

Figure 5. Revised Johnson-Cook model with the plastic starting point of elastic limit

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图 6 塑性起点为屈服极限的修正Johnson-Cook公式曲线

Figure 6. Revised Johnson-Cook model with the plastic starting point of yield limit

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