Scaling of internal dissipation of polycrystalline solids on grain-size and frequency

doi:10.1016/j.actamat.2020.10.004

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	Scaling of internal dissipation of polycrystalline solids on grain-size and frequency
	Duan CC(段闯闯); Wei YJ(魏宇杰)
刊名	ACTA MATERIALIA
	2020-12
卷号	201 页码:350-363
关键词	Internal friction Loss modulus Dissipation Viscoelasticity Polycrystalline solids
ISSN号	1359-6454
DOI	10.1016/j.actamat.2020.10.004
英文摘要	Internal friction is essential for nearly all solids to dissipate kinetic energy through internal mechanisms. The pioneering analyses by Zener (Phys. Rev. 60 (1941) 906-908) and Ke (Phys. Rev. 71 (1947) 533-546) demonstrated the existence of a single friction peak in the loss modulus spectrum of polycrystalline solids, which is attributed to viscous sliding in grain boundaries. In this study, we establish a continuum model coupled elastic deformation, viscous creep and diffusion in grain boundaries and reveal the existence of a second loss modulus peak resulted from viscous deformation within grain boundaries. The corresponding two frequencies when internal dissipation reaches its local maximum depend on grain size d , one is inversely proportional to d , and the other is proportional to d -3. The effects of local elasticity and diffusion in grain boundaries on the loss modulus spectrum are examined and the condition when the two peaks emerge is identified. The findings can be applied to granular and porous materials, and complex rheology in geosciences, where internal dissipation is momentous for waves and seismic activities. (
分类号	一类
语种	英语
WOS记录号	WOS:000594856800008
其他责任者	Wei, Yujie
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/85680]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Duan CC,Wei YJ. Scaling of internal dissipation of polycrystalline solids on grain-size and frequency[J]. ACTA MATERIALIA,2020,201:350-363.
APA	段闯闯,&魏宇杰.(2020).Scaling of internal dissipation of polycrystalline solids on grain-size and frequency.ACTA MATERIALIA,201,350-363.
MLA	段闯闯,et al."Scaling of internal dissipation of polycrystalline solids on grain-size and frequency".ACTA MATERIALIA 201(2020):350-363.