Molecular insights into shock responses of amorphous polyethylene

doi:10.1088/1361-651X/abcd89

IMECH-IR > 流固耦合系统力学重点实验室

	Molecular insights into shock responses of amorphous polyethylene
	Liao LJ(廖丽涓)1 ; 王新天洋 1,2; Huang CG(黄晨光)1,2,3,4
通讯作者	Liao, Lijuan(liaohuanxin@hotmail.com)
发表期刊	MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
	2021
卷号	29 期号:1 页码:18
ISSN	0965-0393
摘要	Shock responses of amorphous polyethylene (APE) were characterized utilizing two different types of methodology, direct non-equilibrium molecular dynamics (NEMD) and multi-scale shock technique (MSST). Providing a detailed physical view of the shock front itself, pico-second time resolved evolution of plasticity behind the shock front was explored by NEMD through simulating piston driven shock compression. The induced-shock propagation and reflection were visualized according to the evolution of the particle displacement, particle velocity field and pressure field. Exponential relations between the compression rate in a shock wave and the hydrodynamic pressure, in addition, the thickness of shock front and the hydrodynamic pressure were clarified, which quantitatively indicate the shrinkage of shock front resulted from higher compression strength under larger piston velocity. On the other hand, in addition to reproducing the final compressed states, the thermo-dynamical state variables behind the leading shock front were captured by MSST with a much smaller computational cell with enough efficiency and accuracy. Hugoniot relations were obtained to predict the bulk sound speed and two material constants indicating the compressibility with reliable values compared with the existing results. Temperature-dependency was clarified as that high temperature reduces the bulk sound speed with low density and improves the compressibility of material. The temperature-sensitivity of compressibility weakens or even disappears during the transition from glassy state to rubbery state. The critical shock velocity, which equals to the bulk sound speed at a given temperature, was specified to guarantee stable shock wave instead of quasi-isentropic wave propagation in APE. Only a single plastic shock wave with a steep front travelling at a constant velocity greater than the bulk sound speed generates in APE, resulting in the over-driven in the material.
关键词	shock responses amorphous polyethylene molecular insight wave propagation shock Hugoniot
DOI	10.1088/1361-651X/abcd89
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000598692400001
关键词[WOS]	DEFORMATION ; POLYMER ; DEPENDENCE ; SIMULATION ; MECHANISM
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Physics, Applied
资助项目	National Natural Science Foundation of China[11672314]
项目资助者	National Natural Science Foundation of China
论文分区	Q3
力学所作者排名	1
RpAuthor	Liao, Lijuan
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/85874
专题	流固耦合系统力学重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, 15 Beisihuan West Rd, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Future Technol, 19 A,Yuquan Rd, Beijing 100049, Peoples R China; 3.Univ Chinese Acad Sci, Sch Engn Sci, 19 A,Yuquan Rd, Beijing 100049, Peoples R China; 4.Chinese Acad Sci, Hefei Inst Phys Sci, 350 Shushanhu Rd, Hefei 230031, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Liao LJ,王新天洋,Huang CG. Molecular insights into shock responses of amorphous polyethylene[J]. MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING,2021,29,1,:18.
APA	廖丽涓,王新天洋,&黄晨光.(2021).Molecular insights into shock responses of amorphous polyethylene.MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING,29(1),18.
MLA	廖丽涓,et al."Molecular insights into shock responses of amorphous polyethylene".MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING 29.1(2021):18.

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