Name:Fan Xu
Associate Professor
Address:Room B418 School of Mechanical Engineering
Phone:(86)013775372507, (86)511-88797578
Fax:(86)511-88780241
E-mail:xufan-00@126.com
Education
2009-2014 Ph.D, Mechanical Engineering, Xi’an Jiaotong University, China
2004-2007 M.S., Mechanical Engineering, Northeastern University, China
1997-2001 B.S., Mechanical Engineering, Northeastern University, China
Professional Experience
2017- Associate Professor, Jiangsu University, China
2015-2016 Researcher, Material Engineering, KU.Leuven University, Belgium
2014-2015 Assistant Researcher, College of Civil Engineering and Architecture, Zhe Jiang University, China
2007-2009 Lecturer, Mechanical Engineering, Nantong Vocational University, China
2001-2004 Trainee Journalist, Anshan North morning newspaper, China
Social academic post
Research interests
Metal material processing technique and numerical analysis
1. Clinching
The lightweight design of automobiles is one of the primarymethods to realize energy conservation and emission reduction,thus the utilization of light material and structure has become thepreferential approach. The connection of metalsheets is one of the problems of lightweight material needed toconfront and solve. New joining solutions, including the plasticforming processes are more extensively used in the sheet metalstructure assembly processes. Clinching technique is a mechanicaljoining method which involves localized cold deformation of sheetswithout using additional elements.
Figure. Clinched joint
2. Deep drawing
Deep drawing is one of the mostly widelyused forming processes to manufacture automotive bodyparts from sheet metal. Although the deep-drawing process is simple and popular in the industry, it producescups at limited drawing ratios (not exceeding 2.2) because of the drawing resistance from the flange portionand the maximum tensile force at the wall of the semidrawn cup. Many techniques have been adopted toachieve a higher drawing ratio as well as to increaseproduction efficiency and obtain good-quality parts. To
explore the new forming process of the metal sheets, afundamental understanding of the forming limit of thesheet metal is necessary. At the same time, the characteristics of the metal sheet should be discussed. In orderto increase the failure ratio, it is necessary to use FEA.The success of the simulation depends on the capacityof the constitutive models’respective material parameters to accurately reproduce the mechanical behavior.
Figure. Difference material models
3. Damage analysis
Void evolution of the clinched joint under the tensile testprocess is shown inthefollowFigure. During the tensile test of the clinchedjoint, the microvoids will grow, and the smaller inclusions mayprovide initiation sites for sharp microcracks, which may accelerate the final stages of coalescence. Commonly, during the tensiletest, the materials are peeled, but the position of fracture occursin damage region or stress concentration region. During the tensiletest of the clinched joint, when the tensile force exceeds the maximum failure load, the microvoids nucleation may occur in the neckthickness partly, as shown inFig(a). With the displacement of theclamp increasing, the microvoids will grow as shown inFig(b).Considering the work hardening in the neck thickness, with thedisplacement of the clamp increasing, the flaw occurs in the neckthickness along with the shear band as shown inFig(c). Withthe displacement increasing, the flaw is enlarged until the fracture occurs rapidly, as shown inFig(d) andFig(e), respectively.Comparing (a)–(e), it can be seen that theclinched joint experiences shear band localization, growth, flaw,extensions and crack. The numerical results obtained by using theRousselier damage model are close to the experimental results. Itproves that this Rousselier damage model can describe the failureprocess and evolution mechanism.
Figure. Damage Evolution of the clinching process
Teaching Courses
Stamping Processes and Dies Design
Honors and Awards
Main Research Projects
Main Scientific Publications
1. Fan.Xu*,Jun Lin, Shengdun Zhao, Hao Zhang.Research of the Gurson damage model of the different yield functions during the deep-drawing process.The international Journal of Advanced Manufacturing Technology. 2016,91(5-8). 1-17
2. Fan.Xu,Lixia Li, Shengdun Zhao.Numerical analysis of electromagnetic welding for similar metals. 2016 The 7thinternational conference on mechanical and aerospace Engineering.IEEE.London, United Kingdom, 18-22 July 2016.
3. S.Coppieters, H.Zhang, F.Xu,N.Vandermeiren, A.Breda, D.Debruyne. Process-induced bottom defect in clinch forming: Simulation and effect on the structural integrity of single shear lap specimens.Materials &Design. 130(2017):336-348
4. Xiaolan Han, Shengdun Zhao, Chen Liu, Chao Chen,Fan.Xu.Optimization of geometrical design of clinching tools in clinching process with extensible dies.Journal of Mechanical Engineering Science. 2016.
5. Xiaolan Han, Shengdun Zhao, Chao Chen,Chen Liu,Fan.Xu.Optimization of geometrical design of clinching tools in flat-clinching.Journal of Mechanical Engineering Science.2016.
6. Fan.Xu*, S.D.Zhao, XL.Han.Use of a modified Gurson model for the failure behavior of the clinched joint on Al6061 sheet. Fatigue & Fracture of Engineering Materials & Structures[J].2014: (37):335-348.
7. Fan.Xu*, S.D.Zhao, Jin Cai, XL.Han. The experimental analysis of the shear strength of round joints.Proceedings of the Institution of Mechanical Engineers,Part B: Journal of Engineering Manufacture[J]. 2014.228(10):1280-1289.
8. S.D.Zhao,Fan.Xu*, J.H.Guo, XL.Han.Experimental and numerical research for the failure behavior of the clinched joint using modified Roussier model [J].Journal of Materials Processing Technology.2014,214 (10):2134–2145.
9. Fan.Xu*,S.D.Zhao.Predicting the shearing strength of the round clinched joint. Indian Journal of Engineering and Materials Sciences[J]. 2015(5)510-518.
10. Xiaolan Han, Shengdun Zhao, Chenyang Zhang, shuqin Fan,Fan.Xu.Prediction of FV520B steel flow stresses at high temperature and strain rates[J].High Temperature Materials and Processes [J]. 2015,34(6):529-539.
11. Xiaolan Han, Shengdun Zhao,Fan.Xu,Research on clinching with AC servo direct-drive device.Applied Mechanics and Materials.2014(556-562):1318-1322.
12. Yongqiang Zhao, Shengdun Zhao,Fan.Xu, Xiaolan Han.Air-hydraulic Intensifier Equipment and Technology Research of Clinching.Applied Mechanics and Materials.2014(556-562): 1205-1210.
Patents
Plan for Overseas Master & Ph. D
2~3
