Multiscale Model for Crack Propagation of gamma/gamma Interface in gamma-TiAl Alloy Based on Cohesive Zone Model

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	Multiscale Model for Crack Propagation of gamma/gamma Interface in gamma-TiAl Alloy Based on Cohesive Zone Model
	Li Jianhua 1,2; Zhang Cheng 1; Feng Ruicheng 1,2; Wang Junjun 3; Wang Maomao 1; Li Hai-yan 1,2; Qi Yongnian 1; Rui Zhiyuan 1,2
刊名	RARE METAL MATERIALS AND ENGINEERING
	2021-05
卷号	50 期号:5 页码:1617-1625
关键词	gamma-TiAl alloy multiscale model Voronoi tessellation FEM-CZM
ISSN号	1002-185X
英文摘要	The multiscale model was established to predict the crack propagation behavior of gamma-titanium aluminide (TiAl) alloys. The constitutive parameters of the cohesive zone model (CZM) of true twin (TT) gamma/gamma interface were obtained by molecular dynamics (MD). The mesoscopic model of polycrystalline gamma-TiAl was generated via Voronoi method, and the CZM constitutive parameters were coupled into the model. The corresponding critical stress fracture diagrams with non-defect, blunt crack and blunt crack-Fnentral cavity defect were obtained. Furthermore, the polycrystalline model and the overall force-displacement curve were averaged by the geometric similarity, and the damage mechanism of gamma-TiAl alloy was analyzed. At the same time, the macroscopic finite element model (FEM) was constructed according to the homogeneous material hypothesis. A cohesive region was built in the interested crack area, and then the force-displacement relationship and fracture toughness of gamma-TiAl alloy was obtained through the FEM simulation of the compact tensile specimen. Finally, the ,results show that the comparison between the crack propagation behavior obtained from the macroscale finite element simulation and the experimental results proves the validity of the multiscale model. The defects have a significant sensitivity on the strength of the entire near-gamma structure when the ratio of grain is the same, and meanwhile this analysis method can effectively connect various scales and predict the growth of cracks.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	NORTHWEST INST NONFERROUS METAL RESEARCH
WOS记录号	WOS:000662931100017
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148756]
专题	机电工程学院兰州理工大学
作者单位	1.Lanzhou Univ Technol, Sch Mech & Elect Engn, Lanzhou 730050, Peoples R China; 2.Lanzhou Univ Technol, Key Lab Digital Mfg Technol & Applicat, Minist Educ, Lanzhou 730050, Peoples R China; 3.Lanzhou LS Grp Co Ltd, LS Casting & Forging Branch, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Li Jianhua,Zhang Cheng,Feng Ruicheng,et al. Multiscale Model for Crack Propagation of gamma/gamma Interface in gamma-TiAl Alloy Based on Cohesive Zone Model[J]. RARE METAL MATERIALS AND ENGINEERING,2021,50(5):1617-1625.
APA	Li Jianhua.,Zhang Cheng.,Feng Ruicheng.,Wang Junjun.,Wang Maomao.,...&Rui Zhiyuan.(2021).Multiscale Model for Crack Propagation of gamma/gamma Interface in gamma-TiAl Alloy Based on Cohesive Zone Model.RARE METAL MATERIALS AND ENGINEERING,50(5),1617-1625.
MLA	Li Jianhua,et al."Multiscale Model for Crack Propagation of gamma/gamma Interface in gamma-TiAl Alloy Based on Cohesive Zone Model".RARE METAL MATERIALS AND ENGINEERING 50.5(2021):1617-1625.