The effective fracture strength and fracture toughness of solids with energy dissipation confined to localized strips

doi:10.1016/j.ijplas.2019.03.006

CORC > 力学研究所 > 中国科学院力学研究所 > 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)
刊名	INTERNATIONAL JOURNAL OF PLASTICITY
	2019-09-01
卷号	120 页码:47-63
关键词	Effective toughness Fracture strength Strain softening Shear banding Strip-yield model
ISSN号	0749-6419
DOI	10.1016/j.ijplas.2019.03.006
通讯作者	Wei, Yujie(yujie_wei@lnm.imech.ac.cn)
英文摘要	Inelastic 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.
分类号	一类
资助项目	National 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
WOS关键词	CRACK-GROWTH ; METALLIC-GLASS ; SHEAR BANDS ; DEFORMATION ; INTERFACE ; MODEL ; TIP ; MICROSTRUCTURE ; MECHANISMS ; RESISTANCE
WOS研究方向	Engineering ; Materials Science ; Mechanics
语种	英语
WOS记录号	WOS:000477691700002
资助机构	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Foshan University
其他责任者	Wei, Yujie
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/79476]
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	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.