Size-dependent damage and fracture of two-layer systems

doi:10.1016/j.engfracmech.2018.06.040

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	Size-dependent damage and fracture of two-layer systems
	Liang LH(梁立红); Liu HY ; Long H; Wei YG(魏悦广)
发表期刊	ENGINEERING FRACTURE MECHANICS
	2018-08-01
卷号	199 页码:635-646
ISSN	0013-7944
摘要	Two-dimensional three-point bending and four-point bending of two-layer finite element models for a ceramic layer on a metallic substrate are developed to study the damage and fracture characteristics of two-layer systems by introducing an interface cohesive zone model. The damage evolution and fracture modes of ceramic layers of different thicknesses, with loading on the metallic substrates, are compared under different loading conditions based on simulation results. Multiple surface cracks, vertical to the interface between the ceramic and metallic layers, appear in all ceramic layers under four-point bending loading and only in the thinner ceramic layers under three-point bending. For the thicker ceramic layer systems under three-point bending loading, the interface fracture between the ceramic and metallic layers is the main failure mode, agreeing with previous experimental observations. Damage and damage rate, defined by the simulated crack evolution, are found to obey a power law relation with loading and to be consistent with the theoretical predictions based on a mathematical damage model. The damage coefficient, a parameter reflecting the damage rate, is found to be size-dependent based on the simulation and experimental results, and its energy mechanism is discussed. The damage is slower for the thinner ceramic layers with a smaller damage coefficient than that for the thick ceramic layers under three-point and four-point bending loading, and the damage of the ceramic layer systems is faster under three-point bending than under four-point bending, resulted from different crack distributions, damage localization degrees, and energy dissipation. Moreover, the damage is slower for the nanostructured ceramic layers with the stronger interface strength or toughness between two layers.
关键词	Damage Fracture Ceramic layers Interface strength Interface toughness
DOI	10.1016/j.engfracmech.2018.06.040
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000443279500043
关键词[WOS]	THERMAL BARRIER COATINGS ; ACOUSTIC-EMISSION ; EVOLUTION ; DELAMINATION ; FAILURE ; CRACKING ; ENERGY ; MODEL ; SIMULATION ; TENSION
WOS研究方向	Mechanics
WOS类目	Mechanics
项目资助者	NSFC grants of China [11672296, 11372318, 11432014, 11672301, 11521202] ; Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22040501]
论文分区	二类/Q1
力学所作者排名	1
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/77847
专题	非线性力学国家重点实验室
作者单位	1.[Liang, L. H. 2.Long, H.] Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China 3.[Liu, H. Y. 4.Wei, Y. G.] Peking Univ, Coll Engn, Beijing 100871, Peoples R China 5.[Liang, L. H. 6.Long, H.] Univ Chinese Acad Sci, Beijing 101408, Peoples R China
推荐引用方式 GB/T 7714	Liang LH,Liu HY,Long H,et al. Size-dependent damage and fracture of two-layer systems[J]. ENGINEERING FRACTURE MECHANICS,2018,199:635-646.
APA	梁立红,Liu HY,Long H,&魏悦广.(2018).Size-dependent damage and fracture of two-layer systems.ENGINEERING FRACTURE MECHANICS,199,635-646.
MLA	梁立红,et al."Size-dependent damage and fracture of two-layer systems".ENGINEERING FRACTURE MECHANICS 199(2018):635-646.

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