Dynamical heterogeneities and mechanical non-linearities: Modeling the onset of plasticity in polymer in the glass transition

doi:10.1140/epje/i2017-11606-5

	Dynamical heterogeneities and mechanical non-linearities: Modeling the onset of plasticity in polymer in the glass transition
	Masurel, R J 2; Gelineau, P 2; Lequeux, F 2; Cantournet, S 3; Montes, H 1
刊名	The European physical journal. E, Soft matter
	2017-12-27
卷号	40 期号:12 页码:116
ISSN号	1292-895X
DOI	10.1140/epje/i2017-11606-5
文献子类	Article
英文摘要	In this paper we focus on the role of dynamical heterogeneities on the non-linear response of polymers in the glass transition domain. We start from a simple coarse-grained model that assumes a random distribution of the initial local relaxation times and that quantitatively describes the linear viscoelasticity of a polymer in the glass transition regime. We extend this model to non-linear mechanics assuming a local Eyring stress dependence of the relaxation times. Implementing the model in a finite element mechanics code, we derive the mechanical properties and the local mechanical fields at the beginning of the non-linear regime. The model predicts a narrowing of distribution of relaxation times and the storage of a part of the mechanical energy --internal stress-- transferred to the material during stretching in this temperature range. We show that the stress field is not spatially correlated under and after loading and follows a Gaussian distribution. In addition the strain field exhibits shear bands, but the strain distribution is narrow. Hence, most of the mechanical quantities can be calculated analytically, in a very good approximation, with the simple assumption that the strain rate is constant.
语种	英语
内容类型	期刊论文
源URL	[http://119.78.100.183/handle/2S10ELR8/266743]
专题	中国科学院上海药物研究所
通讯作者	Montes, H
作者单位	1.CNRS UPMC ESPCI ParisTech PSL Res Univ, Lab. SIMM, UMR 7615, F-75231, Paris, France. helene 2.CNRS UPMC ESPCI ParisTech PSL Res Univ, Lab. SIMM, UMR 7615, F-75231, Paris, France; 3.MINES ParisTech, PSL-Research University, MAT - Centre des Matériaux, CNRS UMR 7633, BP 87, 91003, Evry, France;
推荐引用方式 GB/T 7714	Masurel, R J,Gelineau, P,Lequeux, F,et al. Dynamical heterogeneities and mechanical non-linearities: Modeling the onset of plasticity in polymer in the glass transition[J]. The European physical journal. E, Soft matter,2017,40(12):116.
APA	Masurel, R J,Gelineau, P,Lequeux, F,Cantournet, S,&Montes, H.(2017).Dynamical heterogeneities and mechanical non-linearities: Modeling the onset of plasticity in polymer in the glass transition.The European physical journal. E, Soft matter,40(12),116.
MLA	Masurel, R J,et al."Dynamical heterogeneities and mechanical non-linearities: Modeling the onset of plasticity in polymer in the glass transition".The European physical journal. E, Soft matter 40.12(2017):116.