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	Preliminary Study on Ductile Fracture of Imperfect Lattice Materials
	Fang, Daining ; Cui, Xiaodong
	2013
关键词	ductile fracture lattice materials imperfection softening plastic dissipation CELLULAR SOLIDS DISSIPATIVE WAVES PHASE-TRANSITION TOUGHNESS BRITTLE MICROSTRUCTURE HONEYCOMBS METALS YIELD
英文摘要	The ductile fracture behavior of two-dimensional imperfect lattice material under dynamic stretching is studied by finite element analyses (FEA). Three isotopic lattice materials, including the regular hexagonal honeycomb, the Kagome lattice and the regular triangular lattice, are taken into account, which are made of an elastic/visco-plastic metal material. Two typical imperfections (vacancy defect and rigid inclusion) are introduced separately. The numerical results reveal novel deformation modes and crack growth patterns in the ductile fracture of lattice material. Various crack growth patterns as defined according to their profiles, such as "X"-type, "Butterfly"-type, "Petal"-type. Crack propagation could induce severe material softening and plastic dissipation of the lattices. Subsequently, the effects of the strain rate, relative density, microstructure topology, and defect type on the crack growth pattern, the associated macroscopic material softening and the knock-down of total plastic dissipation are investigated.; Materials Science, Multidisciplinary; Materials Science, Characterization & Testing; EI; CPCI-S(ISTP); 0
语种	英语
DOI标识	10.4028/www.scientific.net/KEM.535-536.18
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155183]
专题	工学院
推荐引用方式 GB/T 7714	Fang, Daining,Cui, Xiaodong. Preliminary Study on Ductile Fracture of Imperfect Lattice Materials. 2013-01-01.

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