IMECH-IR  > 非线性力学国家重点实验室
The effective fracture strength and fracture toughness of solids with energy dissipation confined to localized strips
Zeng XG; Wei YJ(魏宇杰)
Corresponding AuthorWei, Yujie(yujie_wei@lnm.imech.ac.cn)
Source PublicationINTERNATIONAL JOURNAL OF PLASTICITY
2019-09-01
Volume120Pages:47-63
ISSN0749-6419
AbstractInelastic localized deformation in front of a crack tip dissipates energy and toughens the material. Such concentrated deformation could be resulted from plastic localization in solids, such as interfacial sliding in composites composing of heterogeneous layers, or by shear banding as seen in bulk metallic glasses (BMGs). The mechanisms of the localized deformation and the size of such events are crucial for the effective fracture properties of those particular solids. In this paper, we investigate the effective fracture strength and fracture toughness of solids where dissipation is dominantly contributed from plasticity in narrow strips by shear banding or interfacial sliding. We derive the analytical solutions in solids where energy dissipation occurs in co-planar elastic perfectly plastic strips with strain softening, and also give approximate formulas of the effective strength and toughness for the solids with symmetric plastic strips. The toughening as a function of branching angle, thickness, yield stress, strength-softening ratio and local fracture toughness of the strips is determined quantitatively. The theory is also verified using finite-element (FE) simulations. These theoretical and finite element analysis supply a base for the design of strong and tough materials in which the plastic deformation is restricted within strips.
KeywordEffective toughness Fracture strength Strain softening Shear banding Strip-yield model
DOI10.1016/j.ijplas.2019.03.006
Indexed BySCI ; EI
Language英语
WOS IDWOS:000477691700002
WOS KeywordCRACK-GROWTH ; METALLIC-GLASS ; SHEAR BANDS ; DEFORMATION ; INTERFACE ; MODEL ; TIP ; MICROSTRUCTURE ; MECHANISMS ; RESISTANCE
WOS Research AreaEngineering ; Materials Science ; Mechanics
WOS SubjectEngineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
Funding ProjectNational Natural Science Foundation of China[11425211] ; National Natural Science Foundation of China[11790291] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22020200] ; Foshan University
Funding OrganizationNational Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Foshan University
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/79477
Collection非线性力学国家重点实验室
Recommended Citation
GB/T 7714
Zeng XG,Wei YJ. The effective fracture strength and fracture toughness of solids with energy dissipation confined to localized strips[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2019,120:47-63.
APA Zeng XG,&魏宇杰.(2019).The effective fracture strength and fracture toughness of solids with energy dissipation confined to localized strips.INTERNATIONAL JOURNAL OF PLASTICITY,120,47-63.
MLA Zeng XG,et al."The effective fracture strength and fracture toughness of solids with energy dissipation confined to localized strips".INTERNATIONAL JOURNAL OF PLASTICITY 120(2019):47-63.
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