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Energy dissipative mechanism of graphene foam materials
Wang C(王超); Pan DX(潘斗兴); Chen SH(陈少华)
Source PublicationCARBON

Graphene foam (GrF) is a new kind of multi-porous material with many potential applications owing to its excellent multi-functional properties, especially its dissipation capability. However, both the dissipative mechanism and some experimental phenomena remain poorly understood. Here, systematic coarse-grained molecular dynamic simulations (CGMD) are conducted to study these issues. The typical stress-strain relationships found in experiments under large-strain loading-unloading and small-strain cyclic load are first reproduced. Based on microstructure analysis, three major dissipative mechanisms in the scale of flakes, i.e., rippling, sliding and impacting, are uncovered. The influencing effects of cycle number, strain magnitude and loading rate on dissipation are further investigated. It is found that the much higher dissipation in the first loading cycle is essentially due to drastic flake rearrangements, which decreases to a smaller one in subsequent cycles. In addition, the dissipation increases almost linearly with the strain magnitude in the first cycle, while it increases with a reduced slope in subsequent cycles due to the flake stacking structures. For a given strain magnitude, the dissipation will be enhanced as the loading rate increases. These results deepen our understanding on the dissipative mechanism of GrFs and should be helpful for the development of novel multi-functional graphene-based composites. (c) 2018 Elsevier Ltd. All rights reserved.

KeywordGraphene foam material Energy dissipative mechanism Coarse-grained molecular dynamic method Stress-strain curve Microstructural evolution
Indexed BySCI ; EI
WOS IDWOS:000428233000069
WOS Research AreaChemistry, Physical ; Materials Science, Multidisciplinary
WOS SubjectChemistry ; Materials Science
Funding OrganizationNSFC [11602270, 11532013, 11372317] ; Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22040503] ; BIT Creative Research Plan
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Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorChen SH(陈少华)
Affiliation1.Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Hefei Inst Phys Sci, Inst Adv Mfg Technol, Changzhou 213164, Peoples R China
3.Beijing Inst Technol, Inst Adv Struct Technol, Beijing 100081, Peoples R China
4.Beijing Inst Technol, Beijing Key Lab Lightweight Multifunct Composite, Beijing 100081, Peoples R China
5.Beijing Inst Technol, Collaborat Innovat Ctr Elect Vehicles Beijing, Beijing 100081, Peoples R China
Recommended Citation
GB/T 7714
Wang C,Pan DX,Chen SH. Energy dissipative mechanism of graphene foam materials[J]. CARBON,2018,132:641-650.
APA Wang C,Pan DX,&Chen SH.(2018).Energy dissipative mechanism of graphene foam materials.CARBON,132,641-650.
MLA Wang C,et al."Energy dissipative mechanism of graphene foam materials".CARBON 132(2018):641-650.
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