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Title:
The coupling effect of size and damage in micro-scale metallic materials
Author: Ban HX; Yao Y(姚寅); Chen SH(陈少华); Fang DN
Source: INTERNATIONAL JOURNAL OF PLASTICITY
Issued Date: 2017-08-01
Volume: 95, Pages:251-263
Abstract: In order to characterize the deformation behavior accompanying damage of microstructures in micro-scale metallic materials a new theoretical model is developed based on a low order strain gradient plasticity theory. Not only the size effect induced by strain gradient plasticity but also the one of microstructure damage induced by deformation is considered. The feature of the new theory includes two aspects: the strain gradient is taken as an internal variable to affect the tangential hardening modulus without the introduction of high-order stress or high-order boundary condition; both the elastic modulus and the involved intrinsic length are influenced by the microstructural damage. Two commonly used samples with size effect in micro-scales i.e. the thinwire torsion and the ultra-thin beam bending are re-analyzed with the new model. It is found that stiffness of the micro-scale material is gradually reduced along with the increasing deformation and the theoretical prediction is consistent well with the existing experimental data. All the results demonstrate that the present theory should be a promising way for predicting the mechanical behavior of a more complex system for example the micro-particle reinforced metal matrix composite and the recent-hot-studied nano-crystallized gradient materials. (C) 2017 Elsevier Ltd. All rights reserved.
Keyword: Micro-scale material ; Strain gradient ; Size effect ; Damage effect ; Intrinsic length scale
Language: 英语
Indexed Type: SCI ; EI
DOI: 10.1016/j.ijplas.2017.04.012
DOC Type: Article
WOS Subject: Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
WOS Subject Extended: Engineering ; Materials Science ; Mechanics
WOS Keyword Plus: STRAIN GRADIENT PLASTICITY ; DISCRETE DISLOCATION DYNAMICS ; CONTENT B4C/AL COMPOSITES ; CRYSTAL PLASTICITY ; GRAIN-SIZE ; MATRIX COMPOSITES ; LENGTH SCALE ; DEPENDENT DEFORMATION ; MECHANICAL-PROPERTIES ; DUCTILE FRACTURE
WOS ID: WOS:000403438800011
ISSN: 0749-6419
Funder: NSFC(11372317 ; BIT Creative Research Plan ; 11532013 ; 11402270)
First Institution (Yes or Not): true
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/60522
Appears in Collections:非线性力学国家重点实验室_期刊论文

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Recommended Citation:
Ban HX,Yao Y,Chen SH,et al. The coupling effect of size and damage in micro-scale metallic materials[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2017-08-01,95:251-263.
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