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

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	Multiscale Model for Crack Propagation of γ/γ Interface in γ-TiAl Alloy Based on Cohesive Zone Model
	Li, Jianhua 1,2; Zhang, Cheng 2; Feng, Ruicheng 1,2; Wang, Junjun 3; Wang, Maomao 2; Li, Haiyan 1,2; Qi, Yongnian 2; Rui, Zhiyuan 1,2
刊名	Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
	2021-05-01
卷号	50 期号:5 页码:1617-1625
关键词	Aluminum alloys Binary alloys Crack propagation Cracks Fracture toughness Molecular dynamics Stress intensity factors Titanium alloys Constitutive parameters Crack propagation behavior Finite element simulations Force-displacement curves Force-displacement relationships Gamma-titanium aluminide Gamma/gamma interfaces Polycrystalline models
ISSN号	1002185X
英文摘要	The multiscale model was established to predict the crack propagation behavior of γ-titanium aluminide (TiAl) alloys. The constitutive parameters of the cohesive zone model (CZM) of true twin (TT) γ/γ interface were obtained by molecular dynamics (MD). The mesoscopic model of polycrystalline γ-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+central 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 γ-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 γ-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-γ 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. Copyright © 2021, Northwest Institute for Nonferrous Metal Research. Published by Science Press. All rights reserved.
语种	英语
出版者	Science Press
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150883]
专题	机电工程学院兰州理工大学
作者单位	1.Key Laboratory of Digital Manufacturing Technology and Application, Ministry of Education, Lanzhou University of Technology, Lanzhou; 730050, China; 2.School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; 3.LS Casting and Forging Branch, Lanzhou LS Group Co., Ltd, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Li, Jianhua,Zhang, Cheng,Feng, Ruicheng,et al. Multiscale Model for Crack Propagation of γ/γ Interface in γ-TiAl Alloy Based on Cohesive Zone Model[J]. Xiyou Jinshu Cailiao Yu Gongcheng/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 γ/γ Interface in γ-TiAl Alloy Based on Cohesive Zone Model.Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering,50(5),1617-1625.
MLA	Li, Jianhua,et al."Multiscale Model for Crack Propagation of γ/γ Interface in γ-TiAl Alloy Based on Cohesive Zone Model".Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering 50.5(2021):1617-1625.