Free volume based nonlinear viscoelastic model for polyurea over a wide range of strain rates and temperatures

doi:10.1016/j.mechmat.2020.103650

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Free volume based nonlinear viscoelastic model for polyurea over a wide range of strain rates and temperatures
	Gong CC(龚臣成)1,4; Chen Y(陈艳)1,4; Li, Ting 3; Liu, Zhanli 2; Zhuang, Zhuo 2; Guo, Baohua 3; Wang HY(汪海英)1,4; Dai LH(戴兰宏)1,4
刊名	MECHANICS OF MATERIALS
	2021
卷号	152 页码:11
关键词	Nonlinear viscoelasticity Free volume Constitutive model Polyurea
ISSN号	0167-6636
DOI	10.1016/j.mechmat.2020.103650
通讯作者	Chen, Yan(chenyan@lnm.imech.ac.cn) ; Dai, Lanhong(lhdai@lnm.imech.ac.cn)
英文摘要	A series of quasi-static and dynamic uniaxial compression experiments over a wide range of temperatures were conducted on polyurea elastomer. The stress-strain response of polyurea exhibits extreme nonlinearity, temperature and strain-rate sensitivity. How to comprehensively describe these complex behaviors regulated by the unique micro-structure of polyurea is still an open question. In this paper, a nonlinear viscoelastic constitutive model for polyurea is developed. The nonlinear viscoelasticity, entropic and energetic elasticity are taken into account, correlated with the interaction of chain segments, the stretch of molecular chains and covalent bonds from the perspective of molecular structure. The viscoelastic response is formulated by the hereditary integral of relaxation modulus and strain rate with time. The real time is accelerated by shift factor, which depends on the free volume. A new mechanism of shear-induced increase of free volume, which gives rise to the nonlinearity of viscoelasticity, is proposed, and the corresponding rate-dependent evolution equation of fractional free volume is developed. Parameters in the model are determined through the compression experiments and DMA test. Comparison with experimental data, as well as the data from references, verifies the ability of the model to predict the nonlinear stress-strain response of polyurea over a wide range of temperatures and strain rates.
分类号	二类/Q1
资助项目	National Key Research and Development Program of China[2017YFB0702003] ; NSFC[11790292] ; NSFC[11972346] ; NSFC[11672316] ; Strategic Priority Research Program[XDB22040302] ; Key Research Program of Frontier Sciences[QYZDJSSW-JSC011] ; Science Challenge Project[TZ2016001]
WOS关键词	CONSTITUTIVE MODEL ; MECHANICAL-PROPERTIES ; DEFORMATION-BEHAVIOR ; PHYSICAL-PROPERTIES ; AMORPHOUS POLYMERS ; RUBBER ELASTICITY ; PRESSURE ; MICROSTRUCTURE ; TENSILE ; EQUILIBRIUM
WOS研究方向	Materials Science ; Mechanics
语种	英语
WOS记录号	WOS:000599652400004
资助机构	National Key Research and Development Program of China ; NSFC ; Strategic Priority Research Program ; Key Research Program of Frontier Sciences ; Science Challenge Project
其他责任者	Chen, Yan ; Dai, Lanhong
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/85885]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Tsinghua Univ, Sch Aerosp Engn, Appl Mech Lab, Beijing 100084, Peoples R China 3.Tsinghua Univ, Dept Chem Engn, Adv Mat Lab, Minist Educ, Beijing 100084, Peoples R China; 4.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China;
推荐引用方式 GB/T 7714	Gong CC,Chen Y,Li, Ting,et al. Free volume based nonlinear viscoelastic model for polyurea over a wide range of strain rates and temperatures[J]. MECHANICS OF MATERIALS,2021,152:11.
APA	龚臣成.,陈艳.,Li, Ting.,Liu, Zhanli.,Zhuang, Zhuo.,...&戴兰宏.(2021).Free volume based nonlinear viscoelastic model for polyurea over a wide range of strain rates and temperatures.MECHANICS OF MATERIALS,152,11.
MLA	龚臣成,et al."Free volume based nonlinear viscoelastic model for polyurea over a wide range of strain rates and temperatures".MECHANICS OF MATERIALS 152(2021):11.