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RESEARCH GROUP

Welcome ...
		Yuanguo(Ewan) Chen
		Computer Modeling and Simulation ASEC Room 535 Dept. of Civil Engineering The University of Akron Akron, OH 44325-3905, U.S.A. Tel: 1-330-972-2683 Email: yc39@zips.uakron.edu

EDUCATION

n 08/2006~Present (Expected graduation date: 12/2009)

      The University of Akron, Akron, OH, U.S.A.

      Ph.D. Candidate, Civil Engineering

n 09/2003~03/2006

      Tongji University, Shanghai, P.R. China

      Master of Engineering, Solid Mechanics

n 09/1999~06/2003

      Wuhan University of Hydraulic & Electric Engineering-Yichang, Yichang, Hubei, P. R. China   

      Bachelor of Engineering, Hydroelectric Engineering

    Yuanguo(Ewan) Chen received his bachelor degree in Hydroelectric Engineering, a branch of Civil Engineering in China, where he obtained solid knowledge on Mechanics, Structure and Geo-technology. In 2003, Ewan Chen succeed in competing for the chance to study for his Master degree in Tongji University, the top universities in Civil Engineering in China, where he concentrated his research on the dynamic responses of layered poroelastic medium under high speed moving load, a project supported by the NSF (National Nature and Science Foundation, No. 10372073). In this work, Ewan Chen put forward the analytical solution for the layered poroelasticity under vehicle load and discussed the effect of moving speed and oscillating frequency on the responses of subgrade. The difficulties faced by him during his work in layered problem are very challenging, thus Ewan Chen joined the group of Computer and Modeling Simulation at the University of Akron to continue his research in the layered problem for his Ph.D. degree, where his research included pavement and earth structure, both are layered structure.

RESEARCH

¨ 08/2006~06/2007

An Exploratory Study on Functionally Graded Materials with Applications to Multilayered Pavement Design.

Supported by ODOT/FHWA

The released LTPP data showed that the modulus varied with depth, thus the conventional assumption that every layer had constant moduli could not give birth to satisfactory pavement performance. The newly released MEPDG suggested subdividing every layer to many sublayers, with every sublayer being identical. However, the number of sublayers and field points considered constrained to 20 and 26, respectively, which can not model the variation of modulus satisfactorily. To overcome this challenge, the group of Computer Modeling and Simulation (CMS) at the University of Akron developed an innovative and powerful computation program, MultiSmart3D, which can deals with arbitrary number of lays/sublayers and field points. Based on the work finished by previous group member, Ewan Chen upgraded the program treating single load to the present one treating multiple loads, a more practical situation in transportation engineering. As well, Ewan Chen helped finalize the report (mainly Chapter 7, FHWA/OH-07-012) and the program, MultiSmart3D.

¨ 06/2007~Present

Viscoelastic Modeling of Flexible Pavement

Supported by Eisenhower Graduate Fellowship, FHWA, DOT

    Most existing pavement design programs, e.g. MEPDG, assume pavement material to be elastic for simplicity. However, as we know, flexible pavement is far from pure elasticity, for example, the AC layer shows typical viscoelasticity. In modeling viscoelastic pavement, conventionally only some approximate methods, e.g. collocation methods, finite difference method (FDM), can be employed. Recently, Ewan has developed a unique semi-analytical solution to analyze the lineally viscoelastic pavement analytically in time domain for the first time, a benchmark work in the modeling of viscoelastic pavement.      

    Because of the contribution of his work, Ewan received the competitive Eisenhower graduate fellowship in 2008 supporting his PhD study for two years. Preliminarily, his work will include:

1. model rutting test (APA) and fatigue test (BBF) based on linear viscoleasticity

2. incorporate the semi-analytical solution into the MEPDG.

incorporate the semi-analytical solution into Finite Element Method (FEM) codes, e.g. ABAQUS.

PUBLICATIONS

Journal Papers

¨ Chen, E. Y. G., Pan, E., and Green, R. (2008). “Surface loading of a multilayered viscoelastic pavement: A semi-analytical solution.” Journal of Engineering Mechanics, ASCE. (In review)

¨ Chen, E. Y. G. and Pan, E. (2007). “Responses of a transversely isotropic layered half-space to multiple horizontal loads.” ASCE Geotechnical Special Publication: Innovations in the Characterization, Modeling and Simulation of Pavements and Materials. (in press)

¨ Pan, E., Chen, E., and Alkasawneh, W. (2008). “Layered flexible pavement studies: challenges in forward and inverse problems.” International Journal of Pavement Research and Technology, 1(1), 12-16. (Technique paper)

¨ Chen, Y. G. and Jin, B. (2008). “Dynamic response of a poroelastic stratum to moving oscillating load.” Science in China, Series G: Physics, Mechanics, Astronomy, 38(3), 250-259 (Chinese version); 51(7), 883-893 (English version)

¨ Chen, Y. G. and Jin, B. (2006). “Dynamic responses of a layered poroelastic medium under high speed and time harmonic load.” Chinese Quarterly of Mechanics, 27(2), 212-219.(in Chinese)

Reports

¨ Pan, E., Alkasawneh, W., and Chen, E. (2007). “An exploratory study on functionally graded materials with applications to multilayered pavement design.” FHWA/OH-07-012, Ohio Department of Transportation, Columbus, Ohio. 

Conferences

¨ TRB 86th Annual Meeting

      January 21-25, 2007, Washington DC

¨ The 18th Engineering Mechanics Division Conference of the ASCE

      June 3-6, 2007, Blacksburg, VA
      “Responses of a Transversely Isotropic Layered Half-Space to Multiple   

      Horizontal Loading.”

¨ 9th U.S. National Congress on Computational Mechanics

      July 22- 26, 2007, San Francisco, CA
      “Responses of a Transversely Isotropic Pavement to Multiple Shear Loads.”

¨ Inaugural International Conference of the Engineering Mechanics Institute,     

      May 18-21, 2008, Minneapolis, MN

     “Surface loading of a multilayered viscoelastic pavement: A semi-analytical solution.”

PROGRAM

Computer Modeling and Simulation Group, Department of Civil Engineering, the University of Akron, MultiSmart3D

Based on the innovative multilayer elasticity theory, this program can compute an arbitrary number of field points of the pavement composed of an arbitrary number of layers, with just choosing the corresponding option and inputting the basic information of load and pavement in the user friendly GUI as below.