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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
ISSN0013-7944
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
DOI10.1016/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
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
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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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