Fracture Mechanisms And Size Effects Of Brittle Metallic Foams: In Situ Compression Tests Inside Sem

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	Fracture Mechanisms And Size Effects Of Brittle Metallic Foams: In Situ Compression Tests Inside Sem
	Song HW(宋宏伟); He QJ(何其健); Xie JJ(谢季佳); Tobota A
刊名	Composites Science and Technology
	2008
通讯作者邮箱	songhw@imech.ac.cn
页码	2441-2450
关键词	Metallic Foams Mechanical Properties Stress/Strain Curves Deformation Scanning Electron Microscopy (Sem) Ductile Cellular Solids X-Ray Tomography Aluminum Foam Energy-Absorption Sandwich Beams 3D Characterization Finite-Element Deformation Behavior Collapse
ISSN号	0266-3538
通讯作者	Song, HW (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China.
中文摘要	In situ compressive tests on specially designed small samples made from brittle metallic foams were accomplished in a loading device equipped in the scanning electron microscopy (SEM). Each of the small samples comprises only several cells in the effective test zone (ETZ), with one major cell in the middle. In such a system one can not only obtain sequential collapse-process images of a single cell and its cell walls with high resolution, but also correlate the detailed failure behaviour of the cell walls with the stress-strain response, therefore reveal the mechanisms of energy absorption in the mesoscopic scale. Meanwhile, the stress-strain behaviour is quite different from that of bulk foams in dimensions of enough large, indicating a strong size effect. According to the in situ observations, four failure modes in the cell-wall level were summarized, and these modes account for the mesoscopic mechanisms of energy absorption. Paralleled compression tests on bulk samples were also carried out, and it is found that both fracturing of a single cell and developing of fracture bands are defect-directed or weakness-directed processes. The mechanical properties of the brittle aluminum foams obtained from the present tests agree well with the size effect model for ductile cellular solids proposed by Onck et al. (C) 2008 Elsevier Ltd. All rights reserved.
类目[WOS]	Materials Science, Composites
研究领域[WOS]	Materials Science
关键词[WOS]	DUCTILE CELLULAR SOLIDS ; X-RAY TOMOGRAPHY ; ALUMINUM FOAM ; ENERGY-ABSORPTION ; SANDWICH BEAMS ; 3D CHARACTERIZATION ; FINITE-ELEMENT ; DEFORMATION ; BEHAVIOR ; COLLAPSE
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000260281400019
公开日期	2009-08-03 ; 2009-09-14
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/25868]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Song HW,He QJ,Xie JJ,et al. Fracture Mechanisms And Size Effects Of Brittle Metallic Foams: In Situ Compression Tests Inside Sem[J]. Composites Science and Technology,2008:2441-2450.
APA	宋宏伟,何其健,谢季佳,&Tobota A.(2008).Fracture Mechanisms And Size Effects Of Brittle Metallic Foams: In Situ Compression Tests Inside Sem.Composites Science and Technology,2441-2450.
MLA	宋宏伟,et al."Fracture Mechanisms And Size Effects Of Brittle Metallic Foams: In Situ Compression Tests Inside Sem".Composites Science and Technology (2008):2441-2450.